GASTEROPODA. 95 



11. ScALARiA (?) CANCELLATA. Bwc. Tab. VIII, fig. 22, 22 a. 



Turbo cancellatus. Broc. Coq. Subapenn. p. 377, t. 7, fig. 8, 1814. 

 ScALARiA DECUssATA. jS. Wood. Catalogue 18-12. 



Sc. Testa subulatd, elongatd, tenui,fragili; spird elevatd ; apice acufo ; lonx/itudinaliter 

 costatd ; transversim striatd; anfractibus convexiuscuUs, rotundatis, marginatis : aperturd 

 suhrotundd. 



Shell elongate, tapering, thin, and fragile, with an elevated spire and acute apex ; 

 whorls slightly convex, longitudinally costated, and transversely striated, reticulated ; 

 lower volution marginated, with the base striated ; aperture subcircular, peristome 

 continuous, sometimes thickened. 



Axis, \ an inch. 



Locality. Cor. Crag, Sutton. 



This species is delicate and fragile : my specimens, though numerous, are all more 

 or less broken ; the one figured is the most perfect ; it is not more than half an inch 

 in length, though fragments indicate a size at least half as long again. 



12. Scalaria(?) obtusicostata. 8. Wood. Tab. VIII, fig. 21. 



ScALARiA OBTUSICOSTATA. S. Wood. Catalogue 1842. 



Sc. Testd turritd, subulatd, tenui, fragiU ; spird elevatd ; ajnce acuto ; longitudinaliter 

 costatd ; costis obtusis- transversim tenuissime striatis ; anfractibus convexiuscuUs, mar- 

 ginatis ; aperttird suhrotundd. 



Shell tapering ; spire elevated, with an acute apex, thin, and fragile ; longitudi- 

 nally costated, and finely striated transversely ; the striae most conspicuous between 

 the costse ; volutions slightly convex ; base marginated, rather flat, and finely striated ; 

 mouth subcircular, peristome continuous. 



Axis, \ an inch. 



Locality. Cor. Crag, Sutton. 



Imperfect specimens of this shell are by no means rare ; my largest does not 

 exceed half an inch in lengtli, while fragments indicate its full size to have been an 

 inch. It somewhat resembles Turbo lanceolatus, Broc. (t. 7, f. 7), but appears to 

 differ in having a greater number, as well as a greater convexity of the volutions ; 

 specimens half an inch in length have as many as 10 — 11 volutions, with about fifteen 

 nearly erect and obtuse costse in the last one ; the outer edge of the volution is slightly 

 marginated, so that the costae terminate before reaching the suture. It is finely 

 striated transversely, the striae being most conspicuous between the costse. This is a 

 tender and fragile shell, with the surface slightly eroded. 



The texture of this shell, as well as of the preceding species, is opaque and fragile, 

 differing in composition from the true Scalariae. 



