58 MOLLUSCA FROM THE CRAG. 



the striae being carried over the ribs ; this character is not represented in Brown's 

 figure. The sinus in my specimens is at the suture, but not very distinct, and there 

 is a slight depression on the upper part of the whorl. It differs from Cl. perpulchra in 

 being shorter, in having the volutions more tumid, and in its coarser and more numerous 

 striae. It is a much less elegant shell. 



4. CLAVATULA PERPULCHRA. S. Wood. Tab. VII, fig. 4, 4 a. 



Cl. Testa minutd, fusiformi, turriculd ; spird elevatd ; anfractibus convexis ; lonyitudi- 

 naliter costatis, transversim striatis ; striis 10 11 acutis, elevatis ; labro extus incrassato, 

 intus l&vi ; canali brevi ; sinu apud suturam prof undo. 



Shell small, turriculate, and fusiform ; with an elevated spire and convex volutions ; 

 longitudinally costated ; costse 11 1 2 in the last volution ; transversely striated ; striae 

 sharp and elevated ; outer lip curved, and thickened on the outside, with a large and 

 deep sinus at the suture ; canal short, and very open. 



Axis, \ of an inch. 



Locality. Cor. Crag, Sutton. 



This species much resembles in form and size Cl. linearis, but that shell has fewer 

 striae, and the ribs are narrower ; in this the ribs are broad, touching each other at the 

 base, leaving no space between them ; whereas, in CL linearis, they stand apart, and 

 the transverse striae or ridges are fewer and sharper, with the outer lip less curved, 

 more contracted at the lower part, and having the sinus not quite so deep as in this 

 species. 



Imperfect specimens of this shell are by no means rare at the above locality. It 

 was considered in my Catalogue only as a variety of CL linearis, but, for the above 

 reasons, they are now separated. 



5. CLAVATULA COSTATA (?). Da Costa. Tab. VII, fig. 6 a, 6 b. 



BUCCINUM COSTATUM. Da Costa. Hist. Nat. Test. Brit. p. 128, tab. 8, fig. 4, 1778. 



MUREX COSTATUS. Mont. Test. Brit. p. 265, 1803. 



Fusus COSTATUS. Thorpe. Mar. Brit. Conch, p. 202, 1844. 



PLEUROTOMA MITRTJLA (?). Nyst. Coq. foss. de Belg. p. 528, pi. 44, fig. 3, 1844. 



CL Testa turritd, subulatd, fusiformi ; anfractibus 6 7 convexinsculis, costatis ; costis 

 circa septem, obliquis, obtusis, elevatis ; interstitiis transversim tenuissime striatis; labro 

 acuto, extus marginato, intus incrassato; canali brevi. 



Shell turriculate, tapering, subfusiform, with 67 slightly convex volutions; 

 longitudinally costated ; costae seven, oblique, elevated, and obtuse, transversely 

 striated, with an acute and curved outer lip, thickened within, particularly near the 

 sinus ; and marginated on the outside behind the lip. 



Axis, | of an inch nearly. 



Locality. Cor. Crag, Sutton. 



Red Crag, Sutton and Walton. ? Recent, British Seas. 



