VITKINELLA. Panama /Shells. 185 



is a keel, which is visible on a small part of the penult whorl, 

 and then runs into the suture ; with another somewhat less 

 prominent keel below the periphery, and a third, which is 

 nearly obsolete, around the umbilicus ; with not very distinct 

 transverse raised lines, which are most developed between the 

 two lower keels : apex obtuse : spire convex, slightly elevated : 

 whorls nearly three, with a well impressed suture, very convex 

 above so as to simulate a moderately developed cariua ; last 

 whorl concave on each side of the periphery : aperture orbi- 

 cular : labrum slightly thickened, modified by the ends of the 

 spiral keels ; umbilicus very narrow, deep. 



Mean divergence about 170 ; greatest breadth .045 inch ; 

 least breadth .036 inch ; height .021 inch. 



/Station. Unknown. 



Habitat. Panama. C. B. A. ! 



7 specimens were found in the calcareous sand. 



260. Vitrinella Janus. Nov. sp. 



Shell subdiscoidal : white : with four very narrow acute 

 spiral keels, of which one on the periphery is very prominent, 

 another a little below the periphery is less prominent, and 

 the other two, on the middle of the upper and lower sides, 

 are moderately developed ; with minute spiral striae within 

 the lower keel ; otherwise with transverse striae, which are 

 interrupted by the keels : apex prominent ; spire moderately 

 elevated : whorls three and one-third, with a distinct suture : 

 aperture orbicular, very oblique : lip slightly thickened, angu- 

 lated by the keels : umbilicus deep. 



Mean divergence 160 ; greatest breadth .068 inch ; least 

 breadth .06 inch ; height .03 inch. 



Station. Unknown. 



Habitat. Panama ; C. B. A. ! 

 1 specimen was obtained. 



JULY, 1852. 13 Ann. LTC. NAT. HIST, 



