﻿PROSOBRANCHIATA. 



291 



may be regarded as a variety. The shell, however, is wider, the spire more obtuse, 

 and the body-whorl shorter and more contracted in front; these differences, 

 joined to the peculiar transverse lineation and the smooth, untuberculated keel, have 

 induced me to regard the species as distinct. 



Size. — Axis, 10-12ths of an inch ; diameter, 4-12ths of an inch nearly. 



Locality. — Stubbington. 



No. 215. Pleurotoma callifera. F. E. Edwards. Tab. XXX, fig. 9, a, b ; fig. 10, 



a, b; fig. 11, a, b. 



P. testa sub-turritd, omnino concentrice lineatd : spird obtusiuscidd : anfractibus 

 depresso-convexis ; ad humeros angidatis, fasciold tuberculatd sulcoque spirali bipartitd 

 cinctis ; marginibus posticis concavis, ad suturam lined elevatd marginatis ; lineis concen- 

 tricis supra medias partes anfractuum et canalem distantibus, irregularibus, per-elevatis, 

 denticulatis ; supra humeros et margines posticas exilibics, confertis : aperturd ovali, in 

 canali breviusculo, obliquo exeunti ; labro arcuato, ad Jmmerum profunde sinuato, inlics 

 callos duos oblongos, alteram verticalem, alterum transversum, gerente ; si?iu lato, triangidari. 



Var. raphium (fig. 11, a, b) ; testa minor i, angustiori ; spird graciliori ; lineis concen- 

 tricis sub-distantibus, regularities, simplicibus. 



Var. moniligera (fig. 10, a, b) ; testa spird elatiori : anfractibas postice granulato- 

 marginatis ; lineis transversis medianis distantioribus, prce-denticulalis. 



Shell elongated, turreted, ornamented with concentric, raised lines ; the spire 

 somewhat obtuse and elevated, exceeding the aperture in length ; the whorls, seven or 

 eight, flatly convex and angulated at the shoulders, round which runs a narrow, 

 elevated band, traversed along the middle by a deep furrow, and presenting a series 

 of close-set, regular, vertical tubercles, divided by the transverse furrow, and separated 

 by concave spaces as wide as the tubercles ; the posterior margins, which slope 

 gently backwards, are concave and bordered round the suture by an elevated, sharp- 

 edged, ridge-like line ; the last whorl is much contracted towards the middle, and 

 terminates in front in a rather short, moderately wide, oblique canal. The concentric 

 lines are irregular, prominent, and evenly and rather strongly granulated ; they are 

 very fine and thread-like, close-set, regular, and simple, over the shoulders and pos- 

 terior margins of the whorls ; distant over the middle of the whorl, but more close 

 over the canal. The aperture is ovate : and the outer lip, which is arched, thin, and 

 sharp on the edge, presents within two oblong callosities ; of these one is narrow, ver- 

 tical, curved, and distant from the edge, and it extends from the sinus to the canal ; 

 the other is placed transversely, immediately over the posterior end of the vertical 



