74 



TROCHUS. 



Allied to T. corallinus, but easily distinguished by the deeply 

 separated lirjB of the base. 



T. CRUCiATus Linne. PI. 11, figs. 60, 61 ; pi. 19, figs. 16, 17. 



Shell globose-conic, narrowly umbilicate, spire conic, apex acute,, 

 pinkish ; dark brown, blackish or pink, radiately maculated with 

 white below the sutures, and dotted with white around the center of 

 the base ; whorls 5 to 6, convex separated by canaliculate sutures, 

 spirally granose-lirate ; body -whorl rounded, encircled by about 13 

 lir?e, those above the periphery granulose, about as wide as the 

 interstices, those beneath more separated, smoother ; interstices finely 

 spirally striate ; base convex ; aperture subcircular, oblique ; outer 

 and basal lips rounded, finely crenulate within ; columella slightly 

 concave, bearing a small denticle at base and above near the in- 

 sertion ; parietal wall nearly smooth ; umbilicus deep, narrow, 

 smooth, and white within, bordered by a strong smooth or obsoletely 

 crenulated marginal rib, and surrounded by narrow tract of white. 



Alt. 8-9, diam. 9-10 mill. 



Mediterranean Sea; Cape Verde Is. (Rochebrune.) 



T. cruciatus, Linn., Sijst. Nat. xii, p. 1228. (1767). — Hanley, 

 ipsa Linn. Conch., p. 315, t. 5,f. 6. — Fischer, C07. Viv., p. 298, t. 

 95, f. S.—Monodo7ita vieillotii Payrandeau, Cat. des Annelides et des 

 Moll. Corse, p. 135, t. 6, f. 21-23 {im&).— T. vieillotl Philippi, 

 Conchyl. Cab., p. 80, t. 14, f. 13, and of other authors. — T. med- 

 iterraneus Wood, Ind. Test. SuppL, t. 5, f. 32. — Clanculus cruciatus^ 

 BucQuoY, Dautz. et Dollfus, Moll. mar. du Roussillon, p. 411, t. 

 50, f. 5-12. 



A species of about the size of T. corallinus. The obsolescence of the 

 teeth will distinguish this form from any other Mediterranean 

 Clanculus. The subgenus Clanculopsis of Monterosato is based upon 

 this character ; but in view of the great variation observed in the 

 teeth of nearly related species, and of the fact that this shell is really 

 very closely allied to T. corallinus I am not inclined to give any 

 systematic value to the division. 



Var. GLOBOSO-CONICA Arad, et Ben. (Conch, viv. mar. della Sieilia,. 

 p. 171.) 



Whorls with a broad subsutural margin lacking line ; last whorl 

 with four, penultimate and antepenultimate with three granose lirse. 

 A form said by Aradas and Benoit to be constant, though rare. I 

 have not seen examples. 



