GASTEROPODA. 95 



tube quite smooth, and free from lines or striae of any kind ; their specific sepa- 

 ration depending principally upon the form and number of the reflections of the 

 peristome, which generally produce a continuous line of rib along the spire, in a 

 slightly oblique direction. A larger number of specimens than I possess may 

 possibly remove some of these distinctions. 



11. Scalaeia (?) cancellata. Broc. Tab. VIII, fig. 22, 22 a. 



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

 Scalaeia decussata. S. Wood. Catalogue 1842. 



Sc. Testa subulatd, elongatd, tenui, fragili ; spird elevatd ; apice acuto ; longitudinaliter 

 costald; transversim striata ; anfractibus convexiusculis, rotundatis, marginatis; aperturd 

 xnb rotunda. 



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 sub- 

 circular, peristomes 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. Scalaeia (?) obtusicostata. S. Wood. Tab. VIII, fig. 21. 



Scalauia obtusicostata. £. Wood. Catalogue 1842. 



Sc. Testa lurritd, subulatd, tenui, fragili; spird elevatd ; apice acuto ; longitudinaliter 

 costatd ; costis obtusis : transversim tenuissime striatis ; anfractibus convexiusculis, ?nar- 

 ginatis ; aperturd subrotundd. 



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

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

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

 striated ; mouth subcircular, peristome continuous. 



Axis, \ an inch. 



Localitg. Cor. Crag, Sutton. 



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

 exceed half an inch in length, 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; speci- 

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

 nearly erect and obtuse costae 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 costae. 

 This is a tender and fragile shell, with the surface slightly eroded. 



