ZONITES. 201 



Section ODONTOSAGDA, Martens, 18CO. 

 II. POLYODON, Weinland and Martens. 



Umbilicated, depressed, thin, striulate, whitish, subcarinated ; 

 spire convex; whorls 6, a little convex, with distinct suture, last 

 whorl not descending ; interior of aperture with three doubly 

 interrupted basal lamellae. Diam. 6, alt. 3 mill. 



Unfigured. Haiti. 



Section PROSERPINULA, Albers, 1860. 



H. OPALINA, Adams. PL 60, figs. 50, 52. 



Imperforate, depressed, smooth, very shining, greenish white ; 

 whorls 4j, plauulate, the last depressed, base excavated ; aper- 

 ture with a spiral basal lamina. Diam. 6 mill. 



Jamaica. 



It is H. hyalina, Ads., and H. margarita, Pfr. Bland 

 renamed it H. infortunata, because all three previous names are 

 preoccupied in Helix ; but in Zonites the name above selected 

 may stand. 



II. DISCOIDEA, Adams. Unfigured. Jamaica. 



First described by Pfeiffer as H. Proserpinula. Does it 

 really differ from the above ? 



Subgenus STRTATURA, Morse, 1864. 

 II. FERREA, Morse. PI. 60, figs. 53, 54. 



f Umbilicated, transparent, pale steel-gray, not shining, with 

 ^ delicate growth striae and microscopic revolving lines ; whorls 3, 

 rounded, the last rapidly enlarging ; aperture large, transversely 

 subcircular. Diam. 2*5 mill. 



Maine. 



II. BlNNEYANA, MorSC. 



This species, which I have described on p. 162, may also be 

 considered a Striatura. 



Section PSEUDOHYALINA, Morse, 1864. 

 II. LIMA-TULA, Ward. PL 60, figs. 55-5 1. 



Widely umbilicated, depressed, thin, yellowish white or green- 

 ish white; whorls more than 4, convex, with very fine oblique 

 parallel stria* , becoming obsolete on the base. Diam. 5'5 mill. 



New York, Ohio, Michigan, San Mateo, Gal. 



