336 

 3. The Academy of Natural Sciences of Philadelphia. 



May 26, 1896. — Henry A. Pilsbry and E. G. Vanatta, Catalogue 

 of the species of Cerion with descriptions of new forms. — Edw. D. Cope 

 described a new genus and species of whale-bone whale from the miocene 

 of the Yorktown epoch under the name Cephalotropis coronaius. It was cha- 

 racterized by an elongation of the parietal and frontal bones and established 

 the relation of the group to the Zeuglodonts. 



June 9, 1896. — Wm. J. Fox. Contributions to a knowledge of the 

 Hymenoptera of Brazil, No. I, Scoliidae. Frank C, Baker: The Correct Po- 

 sition of the Aperture of Planorbis. Edw. D. Cope: The Mesenteries of the 

 Lacertilia. Henry A. Pilsbry and E. G. Vanatta: Revision of the slugs of 

 North America : Ariolimax and Aphallarion. — Dr. Harrison Allen made a 

 communication on forms considered specific but which are merely instances 

 of arrested development. He referred in illustration to certain species of 

 Vespertilio claiming that lucifugus is merely an arrested form of gryphus^ the 

 species albescens also being based on similar characters. He had applied 

 the term paedomorphism to the condition which had been worked out, he 

 believed, only among the bats and by himself. He held that the specific 

 names of such forms were not valid and should be dropped. — Dr. Geo. H. 

 Horn remarked that many such instances of arrested development were 

 found among insects. He referred to the dimorphic males of Eupsalis mi- 

 nuta^ a rhyncophorus beetle, on which a French writer had founded three 

 species. The egg-depositing habits of the female and the assistance occa- 

 sionally rendered by the male were commented on. 



June 16th, 1896. — Cloudesley Rutter, "On a collection of Fishes 

 obtained in Swatow, China, by Miss Adele M. Fielde." — David Starr 

 Jordan and Cloudesly Rutter, "On a collection of Fishes made by the 

 Rev. Jos. Seed Roberts in Kingston, Jamaica." — Prof. Edw. D. Cope 

 continued his report on the vertebrate remains from the Port Kennedy Bone- 

 Fissure. Among the Mustelidae were five new species of the genera Lutra, 

 Mephitis, Osmotherium and Putorius. They were represented by at least forty 

 individuals and were described and named. Remains of the largest known 

 tortoise from this section of the country were described as belonging to a 

 new species of Clemmys. C. insculpta was also represented, together with a 

 new box tortoise belonging to the genus Toxaspis. A close ally of the black- 

 snake, genus Zatnenisj was also described. 



Druck von Breitkopf A Hfirtel in Leipzig. 



