882 



part of the whorls at the suture. In other respects it resembles 



C. attramentaria as much as C. subviride does. 



147. Cerithium Turritella (pi. clxxxv. f. 255, 256), Quo)/, 

 Voy. Astr. t. 3. p. 132. pi. 55. f. 8. 



Cerith. testa fusca vel cinerascente, elongato-conica, costellis 

 longitudinalibus et spiralibus tuberculatis leviter cancellata ; an- 

 fractibus ventricosis ; apertura subpyriformi ; canali aperto. 



Shaped like a Turritella, with ventricose, sloping whorls, which 

 are crossed by tuberculated ribs in both directions. Hah. Port 

 Lincoln, Australia. 



148. Cerithium mammillatum (pi. clxxxv. f. 253), llisso, 

 Phil. Enum. Moll. Sic. t. 1. p. 194. pi. 11. f. 13. C. granulatum, 

 Costa. C. costulatum, Costa ? C. " Sardoum," Kiener, Sp. de 

 Coq. pi. 22. f. 2. C. baccatum, Kiener, pi. 22. f. 4. 



Cerith. testa, C. Turritella simili, sed anfractibus breviusculis, 

 superne prope suturam angulatis, sutura excavata. 



The whorls are shorter than in C. Turritella, and angulated 

 near the suture, which is deep. Mediterranean. 



149. Cerithium conicum (pi. clxxxv. f. 251, 252), Blain- 

 ville, Faune Francaise, Moll. p. 158 ; Kiener, Sp. de Coq. pi. 28. 

 f. 3. 



Cerith. testa C. Turritella simili, sed anfractibus brevioribus, 

 tuberculis majoribus, paucis. 



The whorls in this Mediterranean species present two rows of 

 large tubercles. It belongs to the same group as C. Turritella, 

 but hke C. mammillatum the whorls are angulated ; unlike that 

 species, they are large, and disposed in two rows on each whorl. 



150. Cerithium cinerascente (pi. clxxxv. f. 254), Pallas;' 



Cerith. testa C. conico simili, sed cinerascente, tuberculis acutis. 



The texture of this shell is peculiar, and presents a bluish 

 porcelain-like appearance. The tubercles are pointed. Mr. 

 Hanley's collection, from Karak, in Egypt. 



151. Cerithium Layardii (pi. clxxxv. f. 257), A. Adams. 



Cerith. testa turrita, mammillata ; anfractibus gradatis, sub- 

 quadratis, superne elevatis, albo cinctis ; tuberculis rotundatis ; 

 ultimo anfractu subrotundato ; apertura subtrigona. 



Resembling C. couica and C. mammillata, but with square 

 whorls, shouldered and white-banded above. The tubercles are 



