PINERIA. 109 



Shell imperforate, cylindric-tapering or conic, thin, deli- 

 cately ribbed obliquely; composed of 6-9 whorls, swollen or 

 angular peripherally, the last not free in front. Aperture 

 very oblique. Peristome discontinuous, simple, hardly ex- 

 panded, the outer margin oblique, the inner margin not built 

 forward from the columella proper; their insertions widely 

 separated though converging. Axis slightly sinuous. Apical 

 Avhorls vertically ribbed, retained in the adult stage. 



Head* (of P. terebra and beathiana} with but two tentacles, 

 the eye-stalks; the true tentacles being obsolete, according to 

 Poey. 



Jaw of P. viequensis, as in Brachypodella, composed of a 

 great number of narrow plaits. 



Radula of P. viequensis much like that of Brachypodella, 

 two inner lateral teeth on each side being enlarged, with 

 larger ectocones than in Brachypodella; the other (marginal) 

 teeth are few (5 or 6) in number, with minute cusps (pi. 1, 

 fig. 13, P. viequensis from St. Bartholomew; pi. 14, fig. 7, P. 

 viequensis, strongly carinate form from Guadeloupe). 



Type, P. beathiana. Distribution, Isle of Pines, and from 

 Vieque to Barbados, and perhaps Buen Ayre, inhabiting the 

 coastal belt of raised reefs. All the known species are illus- 

 trated on plate 1. 



The genus Pineria, at least as represented by P. viequensis, 

 is closely related to Brachypodella, and probably branched 

 off from the Urocoptid stock at about the same time. In de- 

 tails, the teeth, central, lateral and marginal, are less modified 

 from the Urocoptid type than in Brachypodella; the ecto- 

 cones of the enlarged laterals, especially the inner ones, are 

 better developed than in Brachypodella, in which the inner 

 lateral on each side invariably has a much reduced ectocone 

 or none ; so that it is likely that P. viequensis is to be looked 

 upon as a phylum parallel to Brachypodella, which arose from 

 the same Urocoptid stock, but was independently specialized. 



The chief modification has been in the shell, which has lost 

 that extension forward of the last whorl so characteristic of 

 Urocoptidcc, and which in most of the genera brings the colu- 

 mellar margin up into the plane of the outer lip, even when 

 the aperture is not carried free of the preceding whorl. 



