MOLLUSCA. 



127 



Genus Fusus — (Page 6.) 



36. Fusus Babylonicus, pi. LVK, f. 19. 



Shell fusiform, subcylindrical; body large, obliquely flattened 

 above ; spire not a third the length of the shell, consisting of 

 five cylindrical, rapidly decreasing volutions, which are obliquely 

 flattened above, and terminating in an acute apex ; the whole 

 of which, together with the body, with a slight spiral carina on 

 their superior edge ; aperture oblong-ovate, narrow above, 

 spreading in the centre, and contracted below into a rather 

 narrow canal of medium length; inner lip small, broadly re- 

 flected on the columella ; whole surface covered by numerous 

 spiral, somewhat irregular, slightly waved striae, with inequidis- 

 tant, nearly obsolete, longitudinal wrinkles; colour cream-white; 

 the aperture pale golden-yellow. 



This shell has much the aspect of Fusus antiquus, and pro- 

 bably only a lusus of that species. I found it on the strand, 

 opposite Hull, and it is now in the splendid cabinet of Thomas 

 Norris, Esq., Red Vales, near Bury, Lancashire. 



37. Fusus Boothii, pi. LVII, f. 12. 



Fusus Boothii, Brown, Wernerian Mem., VIII, p. 50, pi. 1, 

 f. 1. 



Shell strong, with eight deeply defined, well rounded volu- 

 tions, tapering to an acute apex ; provided with numerous, 

 slightly oblique, strong, longitudinal ribs, which, together with 

 the interstices, are crossed by close-set, strong, spiral striae, 

 between most of which are finer striae, giving the shell a lamel- 

 lated aspect ; suture of the spire broad, concave, and not cros- 

 sed by the ribs, but spirally striate; aperture oblong-ovate, a 

 little contracted above, and furnished with two longitudinal 

 purple belts, leaving the margin next the outer lip white ; pillar 

 lip white, smooth, with a slight longitudinal groove near its 

 external margin, and furnished with a brownish-purple spot 

 above ; outer lip thick, flattened on the edge with a zigzag 

 groove in its centre, and a slightly rounded sinus above, at its 

 junction with the body; outer margin crenated; canal short, 

 and wide; external surface of a deep chocolate-brown. Length 

 five and a half eighths of an inch; breadth somewhat more than 

 a quarter of an inch. 



This beautiful species was dredged in Rothesay Bay, by 

 Mr. Smith, and, with it, the fragment of a shell of the same 

 species, measuring upwards of three-eighths of an inch in 

 diameter, so that this species must attain the size of nearly an 

 inch. When we first, removed it from the dredge, we took it 

 for the F. purpureus, but on a more close examination, we 

 found it to differ from that shell in the following particulars. 

 It has fewer volutions, the spire is shorter, and not quite so 

 taper, in the thickness and other characters of the outer lip 

 it differs materially, and it is destitute of the striae inside the 

 aperture. 



30. Fusus carinatus, pi. LVII, f. 20. 



Murex carinatus, Pennant, Brit. Zool., IV, p. 123; Dono- 

 van, pi. 109 ; Turton, Conch. Diet., p. 88, pi. 27, f. 95. 



I consider this a mere lusus of Fusus antiquus, which is by 

 no means uncommon in Ireland, sometimes with two, and at 

 others with three carina?. This is figured from a specimen in 

 the possession of M. J. O'Kelly, Esq. ; and Robert Ball, Esq., 

 of Dublin, obliged me with a large specimen which is only 

 bicarinated ; and probably figures 10 and 13, pi. VI, is another 

 form of the same. 



Genus Pyramis (Page 14.) 



22. Pyramis trifasciatus, pi. VIII, f. 30. 



Pyramis trifasciatus, First Ed., pi. 51, f. 30; Turbo trifas- 

 ciatus, Adams, Linn. Tr., V, p. 2 pi. 1, f. 13, 14; Turbo unifas- 

 ciatus, Montagu, p. 327. 



Shell smooth, conic, white ; spire with four slightly inflated 

 volutions, separated by a narrow and shallow suture ; with 

 three purplish-brown bands on the body volution, which 

 become confluent in the two lower volutions of the spire, 

 situate close to the suture; aperture suboval ; outer lip thin, 

 and very slightly reflexed ; columellar lip somewhat thickened, 

 and reflected. 



Found, but rarely, on the shore at Southampton ; and Bur- 

 ran Island, Devonshire. 



Genus Pleurotoma (Page 8.) 



4. Pleurotoma Trevellianum, pi. LVII, f. 1. 

 Pleurotoma Trevellianum, Turton, Mag. Nat. Hist., VII, p. 



351 ; Macgillivray, Moll., p. 172. 



Shell fusiform, turreted ; body about double the length of 

 the spire ; which consists of six turreted, flat-sided, nearly 

 cylindrical volutions, flattened above, abruptly diminishing, and 

 terminating in an acute apex ; sulural line very narrow ; aper- 

 ture pure white, oblong-ovate, terminating in a canal of medium 

 length ; outer lip with a pretty deep, rounded sinus near its 

 junction with the body ; inner lip smooth, glossy, and rather 

 broadly reflected on the columella; whole surface of a pale 

 yellowish-white, and covered with numerous, close-set, longi- 

 tudinal, smooth ribs ; the interstices covered with many strong, 

 transverse striae. Length nearly three-quarters of an inch ; 

 breadth about a third of its length. 



This shell has much the aspect of Fusis turricula, but will 

 at once be distinguished from it by the pretty large sinus on 

 the superior portion of the outer lip ; its diameter is also 

 greater in proportion to its length, and the ribs and striae are 

 considerably more numerous. 



First discovered by Mr. Bean, at Scarborough, where it is 

 abundant; Macgillivray gives it as a deep water species, off 

 Aberdeen ; and I lately procured it among specimens obtained 

 by the dredge, at Prestonpans, East Lothian. 



5. Pleurotoma decussatum. 



Pleurotoma decussatum, Macgillivray, Moll. Ab., p. 172. 



Shell elongated, fusiform, rather thick ; volutions rounded ; 

 spire tapering to a fine point ; suture distinct ; whole covered 

 with longitudinal ribs, narrower than their interstices, which 

 are provided with numerous spiral, thin laminae, also crossing 

 the ribs, on which they form small oblong tubercles; aperture 

 oblong-ovate, with an elongated, oblique canal ; colour yellow- 

 ish-white. Length a quarter of an inch. 



Found by Professor Macgillivray, in deep water, off Aber- 

 deen, and at Boddam, near Peterhead. 



The Professor says, "It appears to agree with Captain 

 Brown's Fusus decussatus." If so, it must be a Fusus, because 

 my shell is totally devoid of the distinguishing character of 

 Pleurotoma, namely, the sinus in the superior portion of the 

 outer lip, as will be seen by referring to figures 53 and 55, 

 plate V. 



