Dall.] 50 [October 19, 



Class GASTEROPODA. 

 Order DOCOGLOSSA Dall ex Trosch. 1870. 

 Suborder Abranchiata (Gill) Dall. 1870. 



Kadula furnished with a rhachidian tooth and two uncini. Ani- 

 mal destitute of eyes, branchise, and lateral teeth on the area. 



Family Lepetid^e (Gray) Dall. 1869. 



Shell patelliform; apex erect, or anteriorly directed. Muzzle of 

 the animal with an entire edge ; furnished with a tentacular append- 

 age below on each side. 



Formula of the radula, 2 Q , Q 2 » 



Genus Lepeta Dall ex Gray. 1869. 

 A. Lepeta Dall. 



Rhachidian tooth tricuspid, concave in front; central cusp simple, 

 much the largest; lateral cusps small, emarginate, base very broad; 

 uncini with simple cusps. 



Type Lepeta c&ca (Gray) Dall, Am. Journ. Conch., v, p. 141, 1869. 



B. CnjptobrancMa Dall ex Midd. 1869. 



Rhachidian tooth with three short cusps, equal and parallel before 

 and behind; not pointed. Base moderately broad, more or less 

 ornate behind ; uncini with simple cusps. 



Type Cryptobranchia concentrica (Midd.) Dall, Am. Journ. Conch., 

 v, p. 143, 1869. 



C. Pilidium Dall ex Forbes. 1869. 



Rhachidian tooth tricuspid, central cusp much the largest, convex 

 in front; lateral cusps simply pointed; base narrow. Uncini with 

 cusps obliquely twisted. 



Type Pilidium fulvum (Forbes) Dall, Am. Journ. Conch., v, p. 

 146, 1869. 



