A list of mammals obtained by Edmund Heller, collector for the museum, from the coast region of northern California and Oregon, by D. G. Elliot.

v.3:no.11(1903)

Mammals from the coast and islands of northern South America, by Wilfred H. Osgood.

v.10:no.4(1910)

Mammals of an expedition across northern Peru, by Wilfred H. Osgood.

v.10:no.12(1914)

An annotated list of a collection of reptiles from southern and northern Lower California.

v.7:no.1(1905)

Some lower Huronian stromatolites of northern Michigan / Eugene S. Richardson, Jr. --

v.10:no.8(1949)

Amphibians and reptiles of Northern Coahuila, Mexico, by Karl P. Schmidt and David W. Owens.

v.29:no.6(1944)

Snakes of the Hoogstraal expeditions to northern Mexico, by Hobart M. Smith.

v.29:no.8(1944)

A new frog of the genus Kassina from Northern Rhodesia.

v.44:no.18(1963)

Indian sites and chipped stone materials in the northern Lake Michigan area / Lewis R. Binford and George I. Quimby.

v.36:no.12(1963)

Seasonal abundance of the shipworm Neoteredo reynei (Bivalvia, Teredinidae) in mangrove driftwood from a northern Brazilian beach

Shipworms are important decomposers of wood, especially in mangrove forests where productivity is high. However, little emphasis has been given to the activity of shipworms in relation to the export of nutrients from mangroves to adjacent coastal areas. As a first step to obtaining such information, the frequency of colonized mangrove driftwood as well as shipworm density and length were studied by collecting washed up logs during a year at Ajuruteua beach, state of Pará, northern Brazil. A single species, Neoteredo reynei (Bartsch, 1920), was found colonizing driftwood. Although large colonized logs were most common on the beach, shipworm density was higher in small logs, especially during the dry season. In general, however, density was higher during the wet season (January to April) and lowest in July. Overall shipworm mean length was 9.66cm. In large logs, mean length increased between the wet and dry seasons. However, there was no difference in length among log size categories. Mean shipworm length was similar throughout most of the year but tended to be greater in July. Although salinity varied between 10.9 and 40 during the year, no relationship was found between salinity and density or length. The results suggest that shipworm activity in driftwood logs is relatively constant throughout the year. Increased air humidity and rainfall may promote survival during the wet season. Large logs may take longer to colonize and thus have lower densities than small ones which are scarce probably because they are destroyed rapidly by shipworm activity. However, data on the disintegration of logs would be necessary to test this hypothesis. Larger size of shipworms in the dry season may be related to growth after an earlier recruitment period. Shipworms in large logs during the dry season may be better protected from dessication and high temperatures by the insulating properties of the larger volume of wood.

Downeshela oliveirai, a new neotropical predaceous midge from northern Brazil (Diptera, Ceratopogonidae)

A new species of Downeshelea Wirth & Grogan, 1988, D. oliveirai, is described and illustrated based on male and female characteristics. The specimens were collected in Rondônia and Pará states, northern Brazil.

Mammals of the Kelabit Plateau, northern Sarawak.

v.39:no.15(1958)

Giant short-faced bear (Arctodus simus yukonensis) remains from Fulton County, northern Indiana / Ronald L. Richards --, William D. Turnbull -- ; with an appendix by E.J. Neiburger.

n.s. no.30(1995)

Sedimentary structures from the Carbondale Formation (Middle Pennsylvanian) of Northern Illinois / Charles W. Shabica --.

v.33:no.29(1978)

Morphology and dynamics of male gametogenesis in Sympterygia bonapartii (Chondrichthyes, Rajidae) from Northern Patagonia

ABSTRACT The smallnose fanskate, Sympterygia bonapartii Müller & Henle, 1841 is one of the most disembarked items in commercial harbors in Argentina. In this work, the microscopic architecture of mature male gonads and the dynamics of cysts development are analyzed as a contribution to awareness of the reproductive biology of the species. Some biological data related to reproduction are given as well. Two seasons were sampled (fall and spring) and length classes's frequency distribution and maturity stages frequency distribution are given. Size at first sexual maturation for males was estimated at 57 cm of total length. Testes are symmetric, peer, lobed, with several germinal zones. Inside the gonads, there are many spermatocysts, containing reproductive cells at the same developmental stage. On the basis of their cytological and microanatomical features, several maturative degrees of the spermatogenic series were differentiated. Few Leydig cells were recognized at the interstitial tissue among cysts. The microscopic and semiquantitative analysis performed in this work provides morphological information about male gametogenesis and some biological data for the North Patagonian population of this economically and ecologically important species.