[128] 

 2. Opeas subula, Pfeiffer. 



Plate U, figure 17. 



Shell elevated, transparent ; whorls 8, well rounded, the apex 

 ohtuse ; aperture small, oval ; base minutely perforated. White 

 or yellowish. 



Length 12, diam. 2-5 mill. 



Florida (from Cuba). 



3. Melaniella gracillima, Pfeiffer. 



Plate 14, figure 16. 



Elongated cylindrical, thin, with 20 to 30 sharp longitudinal 

 ribs on each whorl ; whorls 8, flattened, the suture deeply im- 

 pressed, apex obtuse ; the last whorl is angular below the mid- 

 dle ; aperture small, elongated, oval, lip and columella both nearly 

 perpendicular. White. 



Length 7'5, diam. 1'6 mill. 



Florida (from Cuba). 



MACROCERAMUS, Guilding. 



This genus belongs peculiarly to the West Indian fauna, and 

 the species mentioned below are only stragglers from it into the 

 subjacent parts of the United States. 



1. Macroceramus Pontifieus, Gould. 



Plate 14, figure 20. 



Fusiformly cylindrical, apex acuminate ; whorls 9 to 12, 

 slightly rounded, closely obliquely costulate : suture impressed, 

 crenulate; aperture small, obliquely rounded, lip slightly 

 reflected ; base with a raised or carinated revolving line. White 

 with brown and bluish clouds or bauds crossing the whorls ob- 

 liquely, and a colored band upon the carinas. 



Length 13, diam. 5 mill. 



Florida. 



