MUSEUM OF COMPARATIVE ZOOLOGY. 395 



Cyclostrema granulum n. a. 



Among the small shells from Samana Bay I have found a little Cyclostrema^ 

 which, as it appears uiidescribed, I. have called C. granulum, and which is 

 about 1.0 nun. iu height and breadth. It is much the shape of G. turhinum, 

 but more elevated and compact, having ten or twelve fine strong spiral cinguli, 

 under which are finer radiating raised incremental lines. It is white with a 

 rounded base and perforate umbilicus, three whorls, a nearly circular ai)erture, 

 with slightly thickened or expanded margin. For so small a shell it seems 

 remarkably solid and strong. It must be one of the smallest of the genus. 



Section GRANIGYRA Dall. 



Shell covered with small pustules or granules, like those on Poromya or 

 Plectodon. 



Cyclostrema (Granigyra) limatum n. s. 



Shell small, white, almost exactly the shape of Trochus fulgidus Jeffreys, 

 but a little smaller, with three extremely rounded whorls covered with small 

 close-set irregular granulations of nearly uniform size like sand-grains; base 

 with a small perforate umbilicus, into which the whorl rounds without carina, 

 callus, or break of any kind. Aperture circular, margins thin, sharp, uniform, 

 not reflected. Max. diam., 2.5; alt., 2.5 mm. 



Habitat. Station 19, off Bahia Honda, Cuba, in 310 fms. 



This singular little shell is a typical Cyclostrema in its conchological features, 

 except for its granular surface. The latter recalls that of Poromya^ but is finer 

 and less regular. 



Super-Family DICRANOBRANCHIA. 



Family HALIOTID^. 



Genus HALIOTIS Linne. 



Haliotis Pourtalesii Dall. 



Haliotis (Padollus) Pourtalesii Dall, Bull. M. C. Z., IX. p. 79, 1881. 



Habitat. Bed of the Gulf Stream, in 200 fras., near the Florida Reefs, 

 Pourtales, March 31, 1869. 



No additional information has yet been received in regard to this species. 

 The type specimen was destroyed in the great fire at Chicago, together with 

 the other collections of the Academy of Sciences and of Pourtales, which had 

 been intrusted to Dr. Stimpson for study. It is the only representative of 

 the genus on the eastern, coast of America. 



