316 BULLETIN OF THE 



Name Key, Florida, in grass below low water, Hemphill; Turtle Harbor, 

 Florida, in 6 fms., Dr. Rush; Samana Bay, Santo Domingo, Couthouy. 



This remarkable and beautiful little species, now first announced as a mem- 

 ber of the fauna of the Southern United States, requires a new name, as that 

 given to it by Dunker and Mdrch was already preoccupied both by Adams 

 and Tiberi. 



These cycloid Scalidce, with the later whorls disjoined and the varices scal- 

 loped, like S. hyalina, Dunkeriana, etc., will probably require a section to 

 themselves, which might well be called Cycloscala. 



Scala (Sthenorhytis) pernobilis Fischer & Bernardi. 



Scalaria pernobilis Fischer & Bernardi, Journ. de Conchyl., V. p. 293, pi. viii. figs. 2 



3, 1856. 

 Scala pernobilis Morch, Journ. Acad. Nat. Sci. Phila., new ser., VIII. p. 196, 1876. 



Habitat. Islet of Marie Galante, near Guadelupe, with a hermit crab, taken 

 in a fisherman's net, Beau; four miles off Morro Light, Havana, Cuba, at 

 Station No. 2, in 805 fms., Blake Expedition; at Station 2601 of the U. S. Fish 

 Commission, thirty-six miles S. \ W. from Cape Hatteras, in 107 fms., gray 

 sand with pebbles, bottom temperature 67°. 4 F. 



This is the finest known species of the group. The only specimen taken 

 alive and perfect is that of the U. S. Fish Commission, which measures 28 by 

 38 mm. The operculum is black, five or six whorled, concave, with a slightly 

 ragged margin, dull outside, polished, with a small central prominence on the 

 inside. The animal exuded a vast quantity of dark purple fluid, and was white 

 in color. 



Scala (Sthenorhytis) belaurita n s. 



Plate XVIII. Fig. lib. 



Shell solid, white, smooth, with a short and sharply pointed spire of ten or 

 eleven rounded whorls and widely expanded pointed varices; the last whorl 

 forming more than half the length of the shell; nucleus glassy, thin, smooth; 

 whorls closely adjacent, axis imperforate; spiral sculpture consisting of a single 

 elevated thread passing from the posterior end of the aperture around the base; 

 whorls smooth and shining, their surface overshadowed by the expanded vari- 

 ces, of which there are thirteen on the last whorl, which seem to be continu- 

 ously joined to those of the preceding whorls; varices thin, broad, oblique, 

 sharp, concave behind, extending directly outward from their attachment lie- 

 hind near the suture to a linguiform point, from which they round to the base 

 of the aperture, and passing that are welded together in a semilunate twisted 

 callus en the axial side of the aperture ; the basal area would be well marked 

 were not the varices continued over it in such a way as to screen it; the aper- 

 ture is entire and almost circular, its margin even with the anterior plane of 

 the varix, which, though polished, is irregularly lightly dimpled or malleated ; 



