PROSOBRANCHIATA. 217 



No. 143. Pleurotoma cocciphora, F. E. Edwards. Tab. XXVI, fig. 2. 



P. testa elongatd, fusiformi, longitudinaliter costellatd, undique spiraliter granidoso- 

 lineatis • anfractibus convexiusculis, angulatis, ad suturas incrassatis, granulatis ; margini- 

 bus posticis mediocriter latis, vix cavatis, tineas jiliformes confertas gerentibus ; costeltis 

 angustis ; lineis spiralibus numerosis, fortiter decussatis, incequalibus, lineis majoribas cum 

 lineis tenuibus alter nantib us : aperturd ovali ; labro leviter arcuato ; sinufere semicircidari, 

 in margine collocato. 



Shell elongate, fusiform, longitudinally ribbed, and having the whole surface orna- 

 mented with spiral raised lines ; spire elevated, pointed : whorls (7 — 9) slightly convex, 

 angulated ; the posterior margins moderately wide, nearly straight, and covered with 

 fine, thread-like, concentric lines ; two on the sutural edge are more prominent than 

 the others, and decussated by the lines of growth so as to present a double row of 

 fine granulations ; the last whorl is produced in front into a long, and apparently 

 nearly straight, and moderately wide canal ; the costellee are narrow, rather short, 

 barely extending beyond the middle of the whorl, and are more or less distant in 

 different specimens ; the spiral lines over the middle and front parts of the shells are 

 numerous and unequal, a slender, thread-like line occasionally intervening between 

 others thicker and more prominent ; all are deeply and regularly decussated by the 

 lines of growth, so that the larger lines assume the appearance of rows of bead-like 

 knobs. The aperture is of an oblong, oval shape ; the outer lip slightly arched ; and 

 the sinus, which is placed towards the front of the margin, is wide, not very deep, 

 and almost semicircular. 



This Pleurotoma closely resembles the young shell of P. crassa, of which, if it 

 were not for the great difference in size, it might be considered to be only a local 

 variety ; the spire, however, is shorter and more conical, the whorls more angulated, 

 less convex and more gradually attenuated in front ; the posterior margins narrower 

 and less concave ; and the sinus nearer the shoulder, and rounder than in that 

 species. The spiral lines also, broken into rows of beads by the lines of growth, 

 form an ornamentation quite distinct in character from the broad, coarse bands which 

 characterise P. crassa. 



The specimen figured forms part of Mr. Wetherell's collection. 



Size. — Axis, rather more than 1 inch ; diameter, 4-12ths of an inch. 



Localitg. — Highgate, where it is apparently very rare. 



