VITEINELLA. Panama Sliells. 185 



is 0. keel, wliicli is visible on a small part of the penult whorl, 

 and then runs into tlte suture ; with another somewhat less 

 prominent keel below the peiiphery, 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 carina ; 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 j height .021 inch. 



Station. — Unknown. 



Habitat. — Panama. — ^C. B, A. 1 



7 specimens were found in the calcareous sand, 



260. Titrinella 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 ; 0. B. A. I 

 1 specimen was obtained. 



JULY, 185S. 4? Ann. Lto. Nat. Hist. 



