238 VOLVULA. 



short, straight, with a very minute chink behind it covered mostly 

 by callus; apex dome like, with a small rising in the center, 

 which in the most perfect and especially young specimens is pointed ; 

 callus on the body narrow, but well marked. Lon. 4*0; lat. 2'0 

 mill. (Dall). 



Off the North Carolina coast, in 18-168 fms. ; Straits of Florida,. 

 150-200 fms., (Dr. Rush). 



F. aspinosa DALL, Blake Gastr., p. 51. 



This very interesting species nearly bridges the gap between 

 typical Volvula and Oylichna. Many of the worn or unfinished 

 specimens show hardly a trace of an apical process ; with the best 

 developed ones it is only a raised point barely as high as the eleva- 

 tion of the outer lip beyond the apex, and never a spine as in the 

 other species. There is something about its form and facies, how- 

 ever, which indicates its relationship even when the point is absent. 

 Apart from the spine it is perhaps nearer F. jBus/mthaii any of the 

 others, but it is more cylindrical, smaller, and has a narrower aper- 

 ture. The shell seems unusually heavy for its small size when a per- 

 fectly mature specimen is examined. (Dall). 



V. PAUPERCULA Watson. PI. 26, figs. 58, 59. 



Shell small, cylindrically oblong, with a short, blunt, but pointed 

 top, white, faintly spiralled. Sculpture : Longitudinals there are 

 fine close-set lines of growth. Spirals the whole shell is scored 

 with fine, shallow, remote, scarcely fretted furrows. Colour ivory- 

 white. Mouth arched, narrow above and throughout the greater 

 part of its length, but widening in front, where the body of the shell 

 contracts on the base ; above, it rises beyond the top of the body, 

 and in front goes slightly beyond the point of the pillar. Outer lip 

 is gently curved in the middle, with a quick bend at either end ; its 

 edge seems to be nearly level, but emarginate in front. Top con- 

 tracts rather quickly to a small central tip. Inner lip : a pretty 

 distinct glaze covers the body ; in front of this the narrow pillar 

 projects somewhat obliquely, with a slight twist and prominent edge, 

 and is rather abruptly cut off at the point ; behind it lies a small 

 furrow running up into a minute umbilical chink. Alt. 0'062 in. 

 diam. 0'03. Mouth, breadth at same place, O'OOS inch. ( Wats.). 



North of Culebra I., West Indies, 390 fms. 



CylicJma ( Volvula) paupercula WATS., Chall. Rep., p. 669, pi. 50, 

 f. 5. 



