. N I.I' ll\ \. 



C. (M "llwiHltntn SM., Ann. Mag. N. II. (4 , IX, |.. 



Var. : Palo roseate, varie^at.^! with nut. if. 



blotches, 



This species is at once known iVoin innnn<>rt<i \. Al., ly the dif- 

 ference of form. It is without the contraction ju-t In-low the 

 trx, tin 1 apical umbilicus is smaller and not surrounded by so sharp 

 an edi:e, the stria' above and below are not so-troiiL'K" mark'-d, and 

 the aperture is not so produced upwards as in that species C,V///.). 



Subgenus CYLICIINKI.I.A Gabb, 1872. 

 GABB, Proc. Acad. Nat. Sci. Phila. 1872, p. 273, type 



C. bidentata. 



The soft parts of the species are unknown ; so that we do not yet 

 know whether this group belongs to Tornatinidce or to .SV-'/y, //,//,,/,/- 

 dce. 



C. BIDENTATA Orbigny. PI. 22, fig. 42 ; pi. 27, fig. 9. 



Shell minute, oblong-oval, shining, smooth, except for indistinct 

 growth striae, and sparse, impressed, spiral lines at the basal part. 

 Spire concealed ; body whorl tapering at both ends ; aperture as 

 long as the shell, very narrow, widened below ; columella short, 

 with a spiral callous fold, and an indistinct nodule below. 

 Alt. 2-6, diam. 1-4 mill. 



Cape Hatteras to S. Domingo and Barbados, 7-168fms. ; Floruit 

 to Texas, near low water mark ; St. Helen". 



Bul/a bidentata ORB., Moll. Cuba i, p. 125, pi. 4, f. 13-16 (1841). 

 Cylwhnella bidentata GABB, Proc. Acad, Nat. Sci. Phila. 1872, p. 

 273, pi. 10, f. 2. MORCH, Malak. Bl. xxii, p. 171. DAM., Blake 

 Gastr. p. 46.Biilla biplicata LEA, Proc. Bost. Soc. N. H. i, p. 204 

 (1844); Bost. Journ. Nat. Hist, v, p. 286. pi. 2b', f. '_>. nnVu/j 

 biplicatus TRYON, Amer. Mar. Conch, p. KM, pi. i:i. t. -213. Cy- 

 /ichna biplicata BUSH, Trans. Conn. Acad. vi, p. 4(17, pi. 4f>, f. 14. 

 Cylichna bidentata Orb., SMITH, P. Z. S. 1890, p. 297. 



C. ORY/A Totten. PL 22, fig. 39 (enlarged). 



Shell not very small, not very thin, translucent, white, regularly 

 diminishing from the middle towards each end, the tip being de- 

 pressed into a shallow pit, and the front being rather pointed ; last 

 whorl enclosing all the others ; surface marked with minute lines of 

 growth, a few revolving lines on the anterior portion, and a few 

 22 



