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Hemarks. Mr. "W. G. Binney, in his Supplement to Terres- 

 trial Mollusks remarks that extensive suites of the various Florida 

 species of Truncatella show connecting links, which renders 

 their separation exceedingly doubtful. I agree with him en- 

 tirely, but as he has deferred to the opinions of Messrs. Pfeiffer 

 and Poey, I do so likewise. The species of Truncatella all in- 

 habit the vicinity of the sea. 



1. Truncatella Caribaeensis, ^Sowerby. 



Plate 18, figures 27, 28. 



Subcylindrical, rimate, solid, truncate ; three or four whorls 

 remaining, longitudinally ribbed, ribs slightly curved, sometimes 

 becoming evanescent on the middle of the whorls, the last whorl 

 sometimes smooth, carinate at the base ; aperture obliquely ovate, 

 peristome continuous, not reflected. Orange or red. 



Length 7-8, diam. 3 mill, 



Florida Keys. 



2. Truncatella subcylindrica, Gray. 



Plate 18, figures 29, 30, 31. 



Subcylindrical, thin, pellucid, rimate, ribbed, ribs crowded, 

 but sometimes evanescent, or visible near the suture only ; whorls 

 4 remaining, somewhat convex but flattened in the middle, the 

 last one somewhat carinated at base ; aperture oblique, widely 

 ovate, lip slightly thickened, its columella portion a little reflect- 

 ed. Light horn color. 



Length 5, diam. 2 mill. 



Florida Keys. 



3. Truncatella bilabiata, Pfeiffer. 



Plate 18, figures 32, 33. 



Cylindrical, rimate, solid, opaque ; ribs curved, elevated, ob- 

 tuse ; whorls remaining 4| to 5, convex, the last scarcely larger 

 than the others ; aperture vertical, broadly oval, scarcely angu- 

 lated above ; peristome double, the inner one continuous, the 

 outer one heavy, white, terminating in a heavy basal carina. 

 Brown. 



Height 5-5, diam. 1-8 mill. 



Florida Keys. 



H, 



