166 ZONITES. 



H. BLAKEANA, Tate. PI. 52, figs. 63-65. 



Umbilicus moderate, profound, shell semitransparent, shining, 

 greenish white, regularly concentrically costulate, the interstices 

 obscurely striate ; whorls 4, rounded, rapidly increasing, suture 

 profoundly impressed. Diam. 3 mill. 



Nicaragua. 

 II. GUAYAQUILENSIS, Pfr. PI. 52, figs. 66-68. 



Widely umbilicated, depressed, discoidal, rather thin, striulatc, 

 light corneous yellow, diaphanous, spire plane ; whorls 5, some- 

 what flattened, slowly increasing, the last rounded, not descend- 

 ing, with obscure opaque white fasciae on the base. 



Diam. 10 mill. 



Guayaquil. 

 II. DECOLORATA, Drouet. PI. 52, figs. 69-71. 



Moderately umbilicated, orbicularly depressed, smooth, very 

 shining, diaphanous, light corneous ; whorls 5-6, depressed, with 

 superficial suture. Diam. 6-7 mill. 



Cayenne. 

 II. SUBHYALINA, Pfr. PI. 52, figs. 72-74. 



Moderately umbilicated, discoidal, rather thin, smooth, shining, 

 whitish hyaline, suture slightly impressed ; whorls 3J, subplane 

 above, the last subdepressed, rounded, not descending in front. 



Diam. 2-5 mill. 



Near Vera Cruz, Mexico. 

 H. MEDIOCRIS, Pfr. frl. 52, fig. 75. 



Scarcely subperforate, depressed, subdiscoidal, thin, smooth, 

 whitish l^aline, spire subplane, suture impressed, submargined ; 

 whorls 4, slightly convex, moderately increasing, the last subdi- 

 lated in front, rounded, base subexcavated, aperture vertical, 

 widely lunar. Diam. 5 mill. 

 ^jx . Sta. Ana, N. Granada. 



&>y 



Unfigured Species. 



*H. PAUCILIRATA, and II. NiTiDOPsrs, Morelet. Guatemala. 



H. ANTONT, Pfr. Panama. 



H. OciiSENir, Phil. Valdivia, Chili. 



