258 PYRAMIDELLID/E. 



C. cLATHRATA, Jeffreys. 



Pale reddish, subcyliiidraceous, not produced ; whorls rounded ; 

 ribs broad, not crowded, their intervals girt at the base with dis- 

 tant revolving raised lines, of which there are two distinct ones 

 on the smaller turns, and an additional one on the body ; an 

 umbilical chink. 



Plate XCIV. fig. 4. 

 Odostomia cktlhmta, Jeff. Ann. and Mag. N. H. ser. 2, vol. ii. (1 848) p. 345. 



As only a single specimen of this newly discovered 

 species has been taken, it is probable that the supposed 

 essential characters may hereafter require revision : in- 

 deed, we cannot but suspect, that it may have to be 

 united with the preceding, to some of whose vai-ieties it 

 approaches very closely. It is of an abbreviated-tur- 

 reted form, a little cylindraceous, not very thin, some- 

 what glossy, and of an uniform pale reddish white. 

 About twenty rather broad, somewhat curved and flat- 

 tened ribs traverse the shell longitudinally ; their pro- 

 found interstices, which seem to widen at their bases, 

 are spirally girt with raised, and almost linear, re- 

 mote costellffi, of which only two are distinctly apparent 

 upon the inferior portion of the volutions of the spire, and 

 three upon the central portion of the body-whorl ; vestiges 

 of finer rudimentary ones are occasionally perceptible 

 above them. There are seven rounded whorls, which ter- 

 minate in a rather bluntish apex, and are separated by a 

 distinct and slightly oblique suture, that is narrower in 

 the last formed turns than in the earlier ones ; they are 

 rather produced, increase rather quickly than otherwise, 

 are manifestly broader below than above, and are pecu- 

 liarly well defined, owing to the rather sudden contraction 



