885 



has only a cut out hollow for a canal, and has the whorls always 

 crenulated at the suture. 



159. Cerithium Ebeninum (pi. clxxxv. f. 267), Bruguiere, 

 Diet. no. 26. Strombus aculeatus, var., et Murex Aluco, var., Gmel. 



Cerith. testa pyramidali, turrita, fusco-nigrescente, angulatim 

 nodosa, spiraliter sulcata ; anfractibus angulatis, noduliferis, ultimo 

 latere varicoso ; apertura alba, fusco tincta, magna, ad spiram 

 elevata ; labiis expansis exfoliatis ; labio interno calloso, expanso ; 

 canali lato. 



A large, darkly coloured, well-known Australian shell, with 

 spirally grooved, angular nodose whorls, and an expanded, irregu- 

 larly undulated aperture. 



160. Cerithium pacificum (pi. clxxxv. f. 268), Sowerby, 

 Gen. of Shells, no. 42. f. 9. C. Humboldti, Valenc., Rec. d'Obs. 

 Zool. 2. 280 (1833). 



Cerith. testa pyramidali, fusco-nigrescente; anfractibus acute 

 angulatis lsevibus, ad angulum nodulosis, ultimo latere subcari- 

 nato ; apertura subquadrilatera ; labio interno calloso ; columella 

 tortua ; labio externo angulato, prominente undato ; canali lato. 



Although very different from C. Ebeninus, this smaller species 

 has some evident affinities with it. The whorls are nearly smooth, 

 very sharply angulated and sharply tuberculated at the angles. 

 The aperture is spreading and angular. Hah. Tombey, Peru, on 

 mud banks, H. C. 



2 b. Aperture sinuous and only slig 'Ally emarginated at the lower 

 part; spire often decollated. — Genus Cerithidea, Swains. 



161. Cerithium obtusum (pi. clxxxvi. f. 271), Lamk., An. 

 s. vert. no. 17. Strombus obtusus, Wood, Supp. pi. 4. f. 8. C. 

 decollatum, Sowerby, Gen. 



Cerith. testa ventricosa, fusca, decollata, costulis longitudinali- 

 bus undulatis et sulcis planulatis spiralibus reticulata ; anfractibus 

 sex, rotundatis, ultimo inferne spiraliter striato ; apertura rotun- 

 data; labio interno tenui, brevi; columella brevi, tortua; labio 

 externo late reflexo ; operculo rotundo, multispirali. 



A moderately solid, ventricose, pyramidal, decollated shell, or- 

 namented by a sort of network formed by the crossing of undu- 

 lating, roughened longitudinal ribs, and rather flattened spiral 

 ridges and grooves. " The Cerithia obtusa live in brackish water 



