GASTEROPODA. 49 



Tr. Testa elongatd, fusiformi, crassd ; anfractibus septem, convexis ; suturis profundis ; 

 longitudinaliter costatis, cos f is 10 14 obtusis, transversim striatis ; aperturd ovatd ; labro 

 intus incrassato, Icevigato ; canali brevi subrecurvd. 



Shell elongate-fusiform, thick, and strong, with seven convex volutions ; longitudi- 

 nally costated, with 10 14 obtuse costse ; transversely striated; aperture ovate; 

 outer lip thickened, without denticulations ; canal short, slightly recurved. 



Axis, 2 inches. 



Locality. Cor. Crag, Gedgrave. 



Red Crag, Walton Naze, Sutton. 



This is a very rare species in the Coralline beds, but abundant in the Red Crag, 

 more especially at Walton, where it is found in good preservation. Var. b has about 

 thirteen costse on the last volution. It has fewer in its young state, and seldom has 

 them in a continued line. In var. a, the costae do not appear upon the body whorl ; 

 the apex tapers to a fine point, and is smooth. The name costatus being preoccupied, 

 I have proposed the above in the place of it. 



7. TROPHON-ALVEOLATUM. /. Sow. Tab. VI, fig. 8, a b. 



Fusus ALVEOLATUS. J. Sow. Min. Conch, t. 525, 1826. 

 S. Wood. Catalogue 1842. 

 Nyst. Coq. foss. de Belg. pi. 39, fig. 21, 1844. 



Tr. Testa turritd, elongatd, subulatd, fusiformi ; anfractibus convexis, superne suban- 

 gulatis; longitudinaliter costettatis, alveolatis ; costettis transversis tuberculosis; aperturd 

 subovatd ; canali breviusculd, subrectd. 



Shell turreted, elongate, fusiform; volutions convex, with two elevated, transverse, 

 tubercular ridges ; upper part of volution subangulated ; longitudinally costellated, 

 decussated, and alveolated ; aperture ovate, with a moderate-sized and nearly straight 

 canal. 



Axis, If inch. 



Locality. Cor. Crag, Gedgrave. 



Red Crag, Sutton and Brightwell. 



This species was, until lately, rare, but numerous specimens have been recently 

 obtained from a newly-opened part of the Coralline Crag at Gedgrave. There are 

 four transverse ridges upon the body of the shell, the upper one of which is the largest, 

 giving a subcarinated form to the volution ; the two lower ridges are covered by the 

 succeeding whorl, leaving only two visible upon the spire. The left lip is very thin 

 in all my specimens, and not so distinct as it is represented in the Belgian shell. 



8. TROPHON CONSOCIALE. S. Wood. Tab. VI, fig. 11, a b. 



Tr. Testa conico-turriculatd, fusiformi, spird elevatd ; anfractibus septem convexis, tumidis, 

 subcarinatis, decussatis, superne planatis ; costis transversis tuberculosis; aperturd ovatd; 

 columelld recurvd ; canali breviusculd. 



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