122 



MOLLUSC A, 



No. 331. Myophoria (Schizodus) Kefersteinii, Munst. 



This genus, of tlie Trigonidaj, is restricted to the Triassic, with 16 species. 

 Trias., Raibl, Carinthia, Austria. 



No. 332. Area biangulata, Lam. 



In the Arcid« family the shell is equivalve and the hinge line has a long, 

 even row of teeth. These specimens are from the Eocene at Grignon, France. 



No. 333. Area diluvii, Lam. 

 Pliocene, Bagalo, Italy. 



» 



No. 334. Nueula strigillata, Goldf. 



Tiyon takes this genus from Arcidae and makes it the type of the family 

 Nuculidfe; 250 fossil species are found ranging from the Palaeozoic. From 

 the St. Cassian Beds (Trias), Tyrol. 



No. 335. Pectuneulus pulvinatus, Lam. 



Tliis is a comparatively modern genus, dating from the Cretaceous; of the 

 very old and abundant family Arcidte. Eocene Tertiary, Grignon, France. 



No. 336. Modiola minuta, Quenstedt. 



Family Mytilidaj; 70 species living and 150 fossil. From the Trias at Nur- 

 tingen, Wurtemberg. 



No. 337. [685, Cast]. Dreissensia (Congeria) subglobosa, Partsch. 



This globose and finely modeled form of bi- 

 valve shell, resembles Mytilus, but lacks the 

 pearly lining. It abounds in the "Tegel," or 

 sandj' loam (Miocene Tertiary) of Brunn, Austria, 

 and is now in the Ward Collection, in the Uni- 

 versity of Rochester. 



No. 338. Ambonyehia radiata, Hall. 



This is a Palaeozoic genus of the Avicula family. From the Cincinnati 

 Group, Cincinnati, Ohio. 



No. 339. Perna mytiloides, Lam. 

 Portland Beds (Upper Oolite), Swindon Wilts, England. 



No. 340. Inoeeramus Sagensis, Owen. 



A characteristic Cretaceous genus; 75 species known. Cretaceous, Cheyenne 

 River, South Dakota. 



