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 lamellre. Diam. 6, alt. 3 mill. 



Unfigured. Haiti. 



Section PROSERPINULA, Albers, 18GO. 



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



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

 whorls 4Jf, planulate, 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 STRIATURA, Morse, 18G4. 



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



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

 delicate growth stride and microscopic revolving lines ; whorls 3, 

 rounded, the last rapidly enlarging ; aperture large, transversely 



subcircular. Diam. 2'5 mill. 



Maine. 



H. BlNNEYANA, Moi'SC. 



This species, which I have described on p. 102, ma^y also be 

 considered a Striatura. 



Section PSEUDOHYALINA, Morse, 1864. 



II. LIMATULA, Ward. PI. 60, figs. 55-57. 



Widely nmbilicated, depressed, thin, 3 T ellowish 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, Cal. 



