378 



PLEUROTOMIDiE. 



spots near the extremity of the pallial tube (Clark)] : palllal 

 tube rather more slender than usual: tentacles awl-shaped, 

 comparatively very long, close together at their bases: eyes 

 on bulgings, very low down, and not far from the origin of the 

 tentacles : foot truncated and acutely angulated, with auricles 

 in front (F. & H), [when fully extended, as long as the shell 

 (Clark)]. 



Shell slender, attenuated towards each extremity, rather 

 thin, semitransparent, very glossy : sculpture, line, sharp, nar- 

 row, and flexuous longitudinal ribs, which extend to the base 

 as well as to the suture, being apparently continued along the 

 spire in an uninterrupted line ; there are 9 on the body- whorl, 

 and usually the same number on the next whorl, after which 

 they dwindle upwards ; the whole surface (except the apex) 

 is covered with very slight microscopic and close-set spiral 

 striae, which can be detected only by a high magnifying-power; 

 the third whorl is keeled in the middle, and has rather 

 numerous and curved longitudinal riblets, the first two whorls 

 being quite smooth : colour pale tawny, encircled by several 

 reddish-brown lines and by a chestnut band below the peri- 

 phery, sometimes also by a narrow and obscure band just below 

 the suture ; the ribs are paler : spire long and gradually 

 tapering; apex as in the last species : whorls 9-10, moderately 

 convex, somewhat angulated by the ribs ; the last whorl occu- 

 pies four-sevenths of the shell : suture rather deep : mouth 

 contracted ; length three^sevenths of the shell : canal straight, 

 rather long and wide ; basal notch rounded : outer lip flexuous, 

 incurved ; edge narrow, sharp, and plain : labial notch small 

 and shallow but distinct, situate as in the last species : inner 

 lip retired, forming a tolerably thick glaze : pillar nearly 

 straight. L. 0-6. B. 0-2. 



Habitat : Gravelly and muddy sand in the coralline 

 zone, on the coasts of Devon and Cornwall (Montagu, 

 Couch, and others); Guernsey (Forbes); Sark (Barlee); 

 Bideford (Montagu); Scarborough (Bean); Goodwick 

 Bay, Barmouth, and Bantry (J. G. J.) ; Cork (Hum- 

 plireys) ; Connemara (Alcock) ; Dublin Bay (Turton) ; 

 Lough Strangford (Dickie) ; Oban (Barlee) ; Hebrides 

 (M*^ Andrew and Forbes) . Fossil in Calabria and Tarento 

 (Philippi) ; Professor Geikie^s statement that it had been 



