NATURAL SCIENCES OF PHILADELPHIA. 225 



he found in Dr. Leid3''s paper quoted. Thus, wliile it is true that 

 it is there remarked of tlie remains of Hadrosaurus occide7italis, 

 " I suspect to be a Dinosaurian, though tliey ma}' have belonged to 

 a Mammalian," he placed the genus " Thespesius," to which he 

 referred the species, under the capital heading " Mammalia." Tlie 

 paper {Proceedings Academy^ 1856, 312) was divided into the 

 headings, Mammalia, Chelonia, and Pisces, and tlie species num- 

 bered, and Thespesiun occidenlalis stands No. 4 under the first- 

 named heading; In regard to the genus Ischyrosaurns which was 

 also originally referred to the Mammalia, Dr. Leidy objected that 

 his modified views had not also been quoted iu the before-men- 

 tioned bulletin. Prof. Cope stated that he had already reprinted 

 those later views in tlie Extinct Batractria and Reptilia of North 

 America, ji. 39, as follows; "altiiougli I have supposed the remains 

 ... to indicate ... an animal allied to the manatee . . . I have 

 auspecied that the}" have belonged to an aquatic reptile unlike an}'^ 

 known." 



December 22. 

 The President, Dr. Ruschenberger, in the chair. 

 Twenty members present. 



Notices of Rhizopods. Prof. Leidy remarked that in the last 

 number of the Arch'iv fur Mikroskopische Anatomie^ presented 

 this evening, there was an interesting paper b}' F. E. Schulze, 

 entitled Studies of the Rhizopods. With the exception of one 

 new species, all of those represented in one of the accompanying 

 plates, Taf. V., which had been previously described by others, he 

 was familiar with, as common in the vicinit}^ of Philadeli)hia. The 

 genera and species are as follows : Euglypha alveolafa, Dujardin ; 

 E. comp7-essa, Cuvtev ; E. globosa, Gavtev; Trinema acinus^ Bii- 

 jardiu ; and Cyphoderia margaritacea^ Schlumberger. Besides 

 these, of nearly related forms, he had found Euglypha spinosa^ 

 Carter, and several other species apparently undescribed. 



1. Euglypha alveolata, Dujardin. E. tuberculata, Duj. 

 ? Difflarjia setlgera, Ehi'euberg. 



This species has an egg-shaped test, with over-lapping elliptical 

 scales which in one focus appear hexagonal in outline. The oral 

 scales are acute, and minutely denticulate. From two to six or 

 more spines project from the sides of the fundus of the test. The 

 largest specimens measure 0.132 mm. long, 0.08 mm. broad, with 

 the moutli 0.028 mm. The smallest ones measured 0.08 mm. long, 

 0.04 mm. broad, with the mouth 0.016 mm. Tliis species is com- 

 mon in the ponds and ditches in the neighborhood of the city. 



