SPIROTROPIS, BEL A. 213 



D. EXASPERATA, Ball. (1002 fms.) Off Cape S. Antonio, Cuba. 



D. ? LEUCOMATA, Ball. Caribbean Sea. 



D. GRATULA, Dall. Caribbean Sea. 



D. DETECTA, Dall. Caribbean Sea. 



D. SERGA, Dall. Caribbean Sea. 



D. SMIRNA, Dall. Off Cape S. Antonio, Cuba. 



D. OLEACINA, Dall. Caribbean Sea. 



D. HAVANENSIS, Dall. Off Havana ; Yucatan Strait. 



D. YERRILLII, Dall. Caribbean Sea. 



D. PERIPLA, Dall. Yucatan Strait. 



D. ELUSIVA, Dall. Yucatan Strait. 



D. MORRA, Dall. Off Havana. 



D. PUNCTATOSTRIATA, Carpenter. Bay of Panama. 



D. APPRESSA, Carpenter. Cape St. Lucas , L. California. 



Genus SPIROTROPIS Sars., 1878. 



S. CARINATA, Philippi. PI. 7, figs. 94, 93. 



Shell white, whorls slightly excavated above, angulated and 

 carinated on the periphery ; sinus broad, deep and remarkably 

 distinct, with the upper edge thickened. Length, -75 inch. 



Mediterranean Sea to Norway. 



Jeffreys thus describes the animal : Body cream-color ; pallial 

 tube short ; tentacles cylindrical, short and slender; eyes black, 

 small but very distinct, placed on the tops of stalks which are 

 united to the tentacles and are one-half their length ; foot pro- 

 portionally large, almost equally broad throughout, squarish in 

 front, and bluntly pointed behind. 



First described as a Sicilian tertiary fossil, and often known 

 under the catalogue-name of P. modiolus, Jan. 



Genus BELA (Leach) Gray, 1847. 



Prof. Yerrill has carefully reviewed the American species of 

 Bela (Trans. Conn. Acad., v, 457-486), elucidating, as satisfac- 

 torily as possible, the synonymy of this very variable group of 

 shells. His connection with the U. S. Fish Commission has 

 given him opportunities for the study of their characters, such 

 as have been enjoyed by no other naturalist. He says : " Each 



