MUREX. 



MOLLUSCA. 



57 



Oblong-ovate; spire consisting of eight prominent, abruptly 

 tapering volutions, deeply divided by the suture ; body furnished 

 with five or six transverse, rather depressed ribs, which are pro- 

 minently knotted at somewhat regular intervals; the spire has 

 only two ribs on each volution; about throe longitudinal varices 

 traverse the body, which however, do not extend beyond the 

 inflation of the volutions; whole surface covered with numerous, 

 elevated, spiral striae, several of which are large towards the 

 centre of each volution; in the intervals between the ribs at 

 the backs of the varices are deep hollows; aperture nearly cir- 

 cular, slightly narrowed above and below; inner lip smooth, 

 thinly reflected on the columella, and slightly subumbilcate 

 behind at the base of the body, with a few wart-like tubercles 

 near its lower extremity; outer lip thick with strong crenula- 

 tions, within, and also on its outer margin; beak short, thick, 

 and slightly ascending. 



Found in the London Clay at Barton Cliff. 



6. M. ALVEOLATCs. — The Celled Murex, pi. XXXIV. fig. 

 15, 16. 



I^ttsus alveolatus. Fleming, Brit. An. p. 354. Murex 

 alveolatus, Sowerby, Min. Conch. V. p. 9- pi. 411, fig. 2. 



Oblong-ovate, considerably acuminated; spire nearly equal 

 to the body in length, consisting of seven rapidly decreasing 

 volutions, deeply divided by the suture, flattened above, and 

 terminating in an acute apex ; whole shell covered by pro- 

 minent longitudinal and transverse ribs, producing deep cell-like 

 interstices, which are provided with less prominent transverse 

 ribs; aperture ovate, a little pointed above and below; beak 

 short and but slightly curved ; inner lip smooth, reflected on 

 the columella, with an open umbilicus behind at its base ; outer 

 lip somewhat thickened, toothed within, and thin at its edge. 



Found in the Crag, Suffolk and Norfolk. 



7. M. BispiNOSus. — The Two-spined Murex, pi. XXXIV. 

 fig. 24, 25. 



Murex hispinosus. Sowerby, Min. Conch. V. p. 15, pi. 4 16, 

 fig. 2. 



Oblong-ovate; spire consisting of six volutions terminating 

 in an acute apex ; body with three foliated and laminated 

 longitudinal varices, beset with two prominent acute canalicu- 

 lated spines on each varix ; these extend over the spire, which 

 is provided with two or three transverse ridges ; between each 

 varix is placed a small tubercle ; aperture ovate ; inner lip 

 slightly reflected on the columella, and continuous with the 

 outer lip, which is thin on the margin, thickened, and toothed 

 within ; beak nearly straight. 



Found at Barton Cliff. 



8. M. Calcar.— The Spur Murex, pi. XXXIV. fig. 31, 32. 

 Murex calcar. Sowerby, Min. Conch. V. p. 7, pi. 410, 



fig. 2. 



Oblong-ovate ; spire acuminated, nearly equal in length to 

 the body, and consisting of six, subturreted, volutions obliquely 

 flattened above, and terminating in a pointed apex ; the spire 

 provided with numerous elevated, sharp ribs, and those of the 

 bodv somewhat obsolete, where they only appear in the form of 

 blunted tubercles; two transverse spinous ribs invest the body 

 volution, and assume a spur-like appearance on the margin of 

 the outer lip, with a slight canal in their centre ; shell covered 

 with strong, remote, elevated, partially granulated striae; aper- 

 ture subquadrangular, slightly pointed on its upper extremity ; 



inner lip smooth and narrowly reflected on the columella, and 

 is continuous on the outer lip, which is thin ; beak long, the 

 canal nearly closed in front. 



Found in the Green Sand, Blackdown. 



9. M. DEFossus The Hidden Murex, pi. XXXIV. fig. 



11, 12. 



Murex defossus. Sowerby, Min. Conch. V. p. 9, pi. 411, 

 fig. 1. Bticcinum defussum, Pilkinton, Linn. Trans. VIL 

 p. 117. 



Oblong-ovate; spire acuminated nearly equal in length to 

 the body, consisting of seven well rounded, deeply defined 

 volutions, terminating in an acute apex ; whole shell covered 

 with numerous, sharp, elevated, longitudinal, and alternately 

 large and small transverse ribs ; intervening cells smooth ; aper- 

 ture ovate, slightly pointed above and below ; inner lip smooth, 

 broadly reflected on the columella above, — where it has one 

 or two irregular plaits, — and narrowing as it descends; outer lip 

 thin on the edge, considerably thickened within, and provided 

 with many, elongated, lamellar teeth ; beak short, and but 

 slightly curved. 



Found at Hordwell. 



10. M. FKONDOsus — The Leaved Murex, pi. XXXIV. fig. 

 22, 23. 



Murex frondosus. Lamarck, Env. de Paris, p. 51. lb. 

 An. San. Vert. VII. p. 573. Sowerby, Min. Conch. V. p. 16, 

 pi. 416, fig. 3. 



Oblong-ovate ; spire short, subturreted, consisting of five 

 deeply defined volutions, and terminating in an acute apex ; 

 body with eight or nine sharp, elevated, longitudinal, foliated 

 varices; crossed by numerous transverse ribs, producing a tuber- 

 culated appearance as they pass over the longitudinal ribs, and 

 giving a rough feel and crisped appearance to the whole of their 

 lamellated surface ; intervening cavities rough ; aperture nearly 

 circular ; beak short, thick, and slightly curved ; canal nearly 

 closed ; inner lip smooth, broadly reflected over the columella 

 above, and abruptly narrowing as it descends ; outer lip sharp 

 on the edge, with a broad foliated expansion on its outer side. 



Found at Highgate Hill and Barton. 



11. M. TRiCARiNATus The Three-keeled Murex, pi. 



XXXIV. fig. 13, 14. 



Murex tricarinatus. Lamarck, An. San. Vert. VII. p. 177- 

 Sowerby, Min. Conch. V. p. 15, pi. 416, fig. 1. Murex asper, 

 Brander, fig. 77, 78, 79, and 80. 



Oblong-ovate; spire about the same length as the body, con- 

 sisting of six subturreted volutions, and terminating in an acute 

 apex ; with three elevated, longitudinal, foliaceous, dentated 

 varices, extending from the body to the tip of the spire ; crossed 

 by about seven wide-set prominent strise, which correspond with 

 the plaits of the varices, these are proviiled with a long, canali- 

 culate spine on the top of each ; aperture semi-ovate ; inner lip 

 slightly reflected on the columella ; outer lip with a broad 

 foliated margin ; beak considerably recurved ; canal rather wide. 



Found at Barton Cliff. 



12. M. QUADRATL'S — The Squarish Murex, pi. XX XIV. 

 fig. 37. 



Murex quadralus. Sowerby, Min. Conch. ^ . p. 7, pi- 110, 

 fig. 1. 



Short, slightly rhomboidal ; spire short, consisting of three 

 gradually tapering, slightly defined volutions, apex rather 



p 



