56 



next preceding; ribs longitudinal, elevated, interrupted, 

 subacute. Aperture nearly round ; the margins circularly 

 united, and terminated by a thin curved wart. 



* S. CLATHRUS. Turbo C. Turt. Lin. Pen. Brit. Zo., 



vol. 4, pi. 81, fig. 111. A. Stew. Elem., vol. 2, 



p. 408. Mont. Test. Brit., rol. 2, p. 296. Borlase, Nat. 

 Hist. Corn., pi. 28, fig. 9. Scalaria C. Flem. Brit. An., 

 p. 310. Rare. I have obtained it from Hannafore, near 

 Looe, and from the Land's-end. 



* S. CLATHRATULUS, Turbo C. Turt. Lin. Mont. 

 Test. Brit., vol. 2, p. 297. Sc. C. Flem. Brit. An., 

 p. 311. Rare. I have only seen it from near the 

 Land's-end, 



S. TURTONI. Flem. Brit. An., p. 311. The only spe- 

 cimen I have seen, and which was obtained at Falmouth, 

 differs iu some respects from the description given by 

 Fleming. The length is about an inch : the lower whorl 

 less inflated than in Sc. Clathrus, tapering regularly to the 

 point. Ribs twelve, flat, and of various sizes, not con- 

 tinuous across the line of separation : so that few of them 

 on the next whorl, are exactly opposite those of the former, 

 and even the number on each varies. Colour pale brown, 

 with two or three darker spiral bands. 



TURBINACEA. 



The shell turreted or conoidal, aperture round or oblong, 

 not dilated ; the margins disunited. When placed on their 

 base, the axis is always more or less inclined, never vertical. 

 Journ. Science. 



TROCHUS. 



GENERIC CHARACTER: The shell conoidal, spire 

 elevated, sometimes rather depressed; the circumference 

 somewhat angular, often thin. Aperture transversely 

 depressed ; margins disunited above. Columella arched, 

 somewhat prominent at the base. An operculum. 



* T. ZIZIPHINUS. Turt. Lin. Pen. Brit. Zo., vol. pi. 80, 



fig. 103. Borlase's Mat. Hist, of Corn., pi. 28, fig. 7. 

 Mont. Test. Brit., vol. 1, p. 274. Stew. Elem., vol. 2, 

 p. 406'. Flem. Brit. An., p. 323. Common, near low 

 water mark. When altogether without colour, it has been 

 regarded as a distinct species, under the name of T. 

 Lyonsii. 

 T. PAPILLOSUM. T. Tenuis. Mont. Test. Brit., 1, p. 275, 

 pi. 10, fig. 3. T. P. Flem. Brit. An., p. 323". Rare. 

 I obtained two specimens from Falmouth : one of them, 

 with the animal, was simply conical, and of small size, 

 the other, found on the shore dead, is about the size of 

 ordinary specimens of T. Ziziphinus, and of more de- 



