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 shght depression on the upper part of the whorh It differs from CI. perpulchra in 

 being shorter, in having the vohitions 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«. 



CI. Testa min It fd,fi(mf ormi, turriculd ; spird elevatd ; anfractihus convexis ; lonyitudi- 

 naliter costatis, tramvcrsim striatis ; stnis 10 — 11 acutis, elevatis ; labro extusincrassato, 

 intus loevi ; canali brevi ; sinu apiid suturam pro/undo. 



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

 longitudinally costated ; costae 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 CI. linearis, but that shell has fewer 

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

 base, leaving no space between them ; whereas, in CI. 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 CI. linearis, but, for the above 

 reasons, they are now separated. 



5. Clavatula costata (?). Da Costa. Tab. VII, fig. 6«, 6 b. 



BucciNUM cosTATUM. Ba Costa. Hist. Nat. Test. Brit, p. 128, tab. 8, fig. 4, 1778. 



MuREX cosTATUs. Mout. Test. Brit. p. 265, 1803. 



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



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



CI. Ihstd turritd, subidatd, fmiformi ; anfractihus G — 7 convexiusculis, costatis ; costis 

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

 acuto, extus marginato, intus incrassato; canali brevi. 



Shell turriculate, tapering, subfusiform, with 6 — 7 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, I of an inch nearly. 



Locality. Cor. Crag, Sutton. 



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



