MANGELIA. 471 



Fusus linearis, Johnston, Berwick. Club, vol. i. p. 236. — Brown, Illust. Conch. 

 G. B. p. 6, pi. 5, f. 54. 

 „ BucJiane?ms, Macgilliv. Moll. Aberd. p. 170 ? (copied, Brit. Marine 

 Conch, p. 202). 

 Pleurotoma scabrum, Jeffreys, Ann. Nat. Hist. vol. xix. p. 31 1. 



Of this pretty species we have figured the three prin- 

 cipal varieties, the purple-tipped (var. scaira), the blunt - 

 ribbed (var. intermedia), and the colourless form (var. 

 pallida). Our description is drawn up chiefly from the 

 first, or southern (and we conceive typical) form ; the 

 aberrations from which are specified in our notice of the 

 two other varieties. 



The shell has an oblong-turreted form, is moderately 

 strong, and is spirally lineated with brown on a whitish 

 ground. These coloured lines are often interrupted, and 

 always seated on the threads or raised striae that revolve 

 around the shell, and render the surface more or less rough 

 and prickly where they surmount the prominent longi- 

 tudinal ribs. These last extend throughout the shell, 

 running from suture to suture, are usually narrower than 

 their intervals, and average from nine to thirteen on the 

 two principal volutions : of the threads there are from four 

 to six (usually five) on the penult, and twice that number 

 on the body- whorl. The spire, which tapers rather quickly 

 to a more or less acute point, and is stained with violet or 

 purple near the tip, is composed of six or seven turns, 

 which, although separated from each other by only a fine 

 suture, are well defined from their roundness (particularly 

 the penult whorl) : they are sometimes, too, a little scalar. 

 The body is about as long as the spire, is more or less 

 ventricose above, but rather quickly attenuated to a shortish 

 but well pronounced beak, that is narrow and scarcely at 

 all recurved : the basal declination is convex. The mouth. 



