l6 NATURAL HISTORY BULLETIN. 



when estimating their characters, that the shell was tenanted 

 by its architect when collected, otherwise blunders are pretty 

 sure to be made. 



The two species following have recently been received by 

 the National Museum and belong to the same general fauna 

 as the collections of the Bahama expedition. I have thought 

 that the paper would gain in interest by including descrip- 

 tions of them. 



LlOTIA CENTRIFUGA n. S. 



Plate i. — Fig. 3. 



Shell small, solid, elevated, with four whorls; nucleus 

 smooth, flat-topped, rapidly taking on coarse imbricated spiral 

 sculpture comprising between the sutures five ridges, the third 

 being at the shoulder with two in front and two behind it; all 

 are crossed by fine imbricating lamellae, visible under magnifi- 

 cation, and by obscure radial sweliings which slightly undulate 

 the posterior pair of spirals, while the third develops subtri- 

 angular radiating projecting points (eleven on the last whorl); 

 the anterior spirals on the periphery of the last whorl are 

 three and three on the rounded base the last of which margin- 

 ates the narrow barely perforate umbilicus; all these spirals 

 are nodulous or serially subimbricated but only the one at the 

 shoulder shows projecting angles; the aperture is circular, 

 entire, smooth inside, its margin modified by the external 

 sculpture; height of the shell 3.5, diameter 3.5 mm. 



Habitat. United States Fish Commission Station 2,328, in 

 203 fathoms off Havana, 1885. United States National 

 Museum 107,419. 



This neat little species needs no special comparisons, being 

 smaller than any of those allied to it from this region and 

 w r ith distinctive sculpture. 



Carditella smitiiii n. s. 

 Plate 1. — Fig. 4. 



Shell minute, ferruginous brown to pale straw-color, bleach- 

 ing white; inflated, with prominent subcentral beaks, evenly 



