24 PHILINE. 



Off Bahia Honda, Cuba, in 220 fins.; near St. Kitts in 245 fms., 

 sand ; off Gaudelupe in 175 fms., sand ; off Dominica in 372 fms., 

 sand ; off Dominica 138 fms., near Barbados in 118 to 209 fms. 



Bottom temperatures ranging from 43 to 64 F. 



This seems to be a rather common species from the frequency with 

 which it was taken. It differs entirely from P. sagra Orbigny, and 

 is wider and squarer than P. candeana Orb., in which, moreover, 

 the spire is represented as visible for two turns at the apex. (Dall). 



P. PLANATA Dall. Unfigured. 



Shell resembling that of P. aperta Linne, but flatter, smaller, 

 more quadrangular, with a shorter and smaller body whorl, more 

 polished surface, and with an impressed spiral line near the apex 

 which extends to the margin, where it marks a slight sinus, behind 

 which the posterior margin is prolonged into a rounded prominent 

 point. The shell is brilliantly polished and smooth except for lines 

 of growth, but near the apex are a few microscopic faint spirals 

 invisible without a lens. The spire is wholly immersed and makes 

 in all about one and a half turns. The ventricular plates are 

 formed like those of P. infundibulum, and not like those of P. aperta. 

 The outer surface of the right plate has two longitudinal blackish 

 lines. The two small plates are somewhat more arched than in P. 

 infundibulum. The inner or triturating surface is similar in both. 

 The length of the largest shell observed is 11*5 and its breadth 

 9-0 mm. 



The soft parts are in general much the same as in P. aperta, but 

 the cephalic lobe extends farther back and the foot is rounder, flat- 

 ter and less rolled up at the sides. As seen from below the body 

 whorl of the shell equals only about one-sixth of the total width. 



Off Dominica in 138 fms.; off Barbados in 140 to 209 fms., bottom 

 temperature 50 to 56 F. 



The species is readily distinguished from any other of the group 

 by the posterior point, which, though smaller, recalls that of Cheli- 

 donura Adams. The soft parts, however, have no resemblance to 

 the very peculiar figure of Quoy and Gaimard. P. amabilis Ver- 

 rill is much nearer P. aperta, from which, as far as the shell is con- 

 cerned, it chiefly differs by being a little narrower than the average 

 aperta. The species are, however, quite variable in this respect. 

 (Dall. Blake Gastr., p. 58). 



