853 



catis, sulcis acute plicatis, ad suturam angulatim acute plici- 

 feris. 



The sculpture is much sharper than in C. obeliscus, and the 

 sulci as it were incised, and a row of sharp, regular plaits at the 

 suture quite distinguishes the species. 



17. Cerithium gemmatum (pi. clxxvii. f. 41), Hinds, Moll. 

 Voy. Sulph. pi. 11. f. 5, 6. 



Cerith. testa clavata, turrita, acuminata, nitida; anfractibus 

 planulatis, triseriatim granosis, serie superiore maxima ; lineis rufis 

 transversim ornatis^ prope labrum divergentibus, infra suturam 

 albidis; apertura alba, superne callosa; columella inferne pro- 

 duct;!, plica parva ; canali obhque descendente. 



With the general form of C. obeliscus and the several similar 

 species, this species is remarkable for the width and flatness of 

 the last whorl, and for the thickened and ascending lips of the 

 aperture. The whorls are beaded in three rows, the most pro- 

 minent being on the upper edge. The fold on the columella is 

 scarcely perceptible, and the slightly upturned canal is short. 

 Panama, three to seven fathoms, on a sandy floor. 



18. Oeritiiium attenuatum (pi. clxxvii. f. 23, 24), Phi- 

 lijjjri, Abbild. t. i. f. 2. C. longicaudatum, Reeve et Adams, Zool. 

 Samarang, Moll. p. 43. pi. 10. f. 15 (1850). 



" Cerith. testa subulato-turrita, e rufo albida ; anfractibus pla- 

 niusculis, cingulis transversis parum elevatis subgranosis circa 

 novem sculptis, supremis costulatis ; apertura late ovata. ; labro 

 crenulato, extus incrassato, intus sulcato ; labio calloso, superius 

 plica transversa distincto ; Cauda angusta, prselonga, obliqua." 



A very lengthened shell, with many whorls (nine in the above 

 description, fifteen •in the accompanying figure, and seventeen in 

 our specimen here represented) ; on each whorl five beaded, al- 

 ternate with five plain, less elevated riblets. The canal is long 

 and very obliquely curved. Pasacao, Island of Luzon, Philip- 

 pines, //. Cuming. 



19. Cerithium Kociiii (pi. clxxvi. f. 13, 14, 15), PMlipjji, 

 Abbild. pi. i. f. 3. 



Cerith. testa angusta, pallida, fusco vel rufo interlineata ; an- 

 fractibus spiraliter costellatis, costcllis alternatim granosis ct pla- 

 ins; apertura subobliqua ; labio externo paululum incrassato; 

 labio interno uniplicato ; canali breve adscendente. 



In sculpture this species resembles C. attenuatum, but the form 



