SUBEMARGINULA. 275 



smaller riblets, and crossed by rather coarse low concentric cords. 

 Apex recurved. The rib terminating in the slit curves a little to- 

 ward the right. 



Color white, pale green or pale flesh-colored ; interior white, pale 

 green or pale fleshy-brown, showing white rays. 



Length 9'., width 7, alt. 3$ mill. 



Florida; Guadeloupe and St. Thomas, West Indies ; Bermuda. 



E. rollandii FISCHER, Journ. de Conchyl. v, p. 356, 1. 12, f. 10. 

 E. dentigera HEILPRIN, Proc. Acad. Nat. Sci. Phil. 1889, p. 142, t. 

 8, f. 7. E. pileum HEILPRIN, /. c. t p. 142, t. 8, f. 6 ; and The 

 Bermuda Islands, p. 188, 189, t. 17, f. 7, 6, 1889. Sub emarg. 

 pumila AD. et auct. (see below.) 



In this small species it is difficult to distinguish the primary from 

 the secondary riblets. The fissure is longer than in other species of 

 SubemargimUa. E. dentigera Heilpr. (pi. 41, figs. 26, 27) is ab- 

 solutely synonymous. 



Var. pileum Heilprin. PI. 41, figs. 18, 19. 



Decidedly more elevated than the type. Length 7, alt. 5 mill. 



Bermuda. 



The figures of dentigera and pileum, copied from Heilprin, do not 

 show the anal slit. It is present in his types, now before me. 



I give here the information relating to the synonymous E. pumila. 



E. pumila A. Adams. (PI. 29, figs. 36). Orbiculate-oval, much 

 depressed, apex subcentral, inclined backward; decussated with 

 nodose, unequal radiating ribs and elevated concentric growth-lines. 

 Margin of the aperture denticulate-crenate, in front deeply sinu- 

 ated ; sinus subquadrate, produced inside in a canal. (Ad.~) 



Florida; Haiti, (Dall). Honduras, (Sowb.). 



Hiibemarg. pumila A. AD., P. Z. S. 1851, p. 91. E. pumila SOWB., 

 Thes. p. 216, f. 80; Conch. Icon. f. 46. DALL, Catal. Mar. Moll. 

 S. E. U. S. p. 170. 



This is the same as E. Rollandi Fischer. The description of the 

 latter is about five years later in date than Adams' but being 

 accompanied by an excellent figure (while that of Adams' was not 

 illustrated until many years later), I have retained the better 

 defined name. Besides, the locality, Honduras, for Adams' pumila 

 was nut known until 1873, while Fischer described shells from a 

 known habitat. Sowerby considers Em. pumila a synonym of 

 E. scabricostata Ad. 



