406 BULLETIN OF THE 



great. If the septum filling the original fissure curves in harmony with the 

 shell, we have typical Rimula according to Mr. Watson's arrangement. If, on 

 the other hand, this septum be convex with relation to the internal face of the 

 shell, it is Cranopsis. 



Rimula frenulata n. s. 



Plate XXVIII. Fig. 4. 



Shell ovate, resembling in general shape and color a single valve of Limatula 

 ovata Wood; apex small, laterally compressed, sharp; nucleus very minute. 

 Sculpture of fine distinct radiating threads, with an intercalary finer thread 

 between nearly every pair. Concentric sculpture of about equally strong 

 threads, which reticulate, but do not pass over or nodulate the radiations ; they 

 are not strictly concentric, being somewhat flexuous or broken at the sides, and 

 sometimes bifurcated. Anal fasciole shallow, continuous from the fissure to 

 the apex, narrow and marked with semilunar incremental ridges; fissure small, 

 shaped like the top of an exclamation point (I). Interior glossy, the fasciole 

 marked by two faint ridges extending to the apex; margin of the shell crenu- 

 lated by the sculpture, apex reaching almost or quite as far back as the poste- 

 rior margin, but a little raised above it, fissure a little variable in position, but 

 mostly in the anterior third of the shell; dorsal surface gently convexly curved. 

 Max. Ion., 6.25 ; max. lat., 3.75; alt., 2.3 mm. 



Habitat. West Florida and the Keys, U. S. Fish Commission. 



This lovely little shell is remarkably distinct from any of the described 

 species known to me. 



Subgenus EMARGINULA s. s. 



, Bmarginula cancellata Philippi. 

 Emarginula cancellata Phil., En. Moll. Sicil., L p. 114, t. v. fig. 15, 1840. 



Habitat. Mediterranean, Madeira, Channel Islands, in 8-250 fms., Jeffreys. 

 Station 21, off Cuba, in 287 fms. Off Havana, Sigsbee, in 127 fms., and near 

 Barbados in 100 fms., all dead specimens. 



These shells are a little more elegant in their sculpture than the European 

 specimens, as the American Cranopsis asturiana are more elegant than those 

 from the Gulf of Gascony, but I feel confident that they may fairly be referred 

 to the same species. 



Emarginula compressa Cantraine. 



Emarginula sp. indeL, Bull. M. C Z , IX. p. 77, 1881. 



E. compressa Cantraine, Bull. Acad. Roy. Bruxelles, IX. 2, 1835. Jeffreys, P. Z. S. 

 1882, p. 679, 1883. 



Habitat. Yucatan Strait, in 640 fms.; off Havana, in 292 fms.; Station 

 19, in 3.10 fms.; Station 21, in 287 fms.; Stations 282 and 296, near Barba- 



