no 
MOLLUSCOUS ANIMALS. 
Ranella LzEvigata, t. 36./. 18. Lam. Hist. vii. 154. 
Inhab. 
This shell does not in the slightest degree differ from the shell described under the above name, which 
is found fossil in Piedmont. See Knorr, Fos. t. 46. f. 819. 
Ranella argus. 
The Triton ranelliformis of Captain King and Mr. Broderip is a true Ranella, and scarcely differs from 
this species, fiom which it is distinguished only in_being rather smooth and slender. 
This species is apt to vary greatly in the ventricoseness of the last whorl, f have some much more 
slender than the specimen of T. ranelliformis sent by Captain King to the British Museum. It also varies 
in the size and distinctness of the tubercles ; in some, the three or four central ribs on the back of the last 
whorl are largely nodulose, while in others the ribs of all the whorls are slightly nodulose ; and, lastly, in a 
few specimens, the ribs of the upper whorls are slightly nodulose, while those of the last are quite smooth. 
TRITONIUM. 
The tentacles conical, with the eyes placed at the end of a sub-cylindrical peduncle, about one-third 
their length, adhering to their base. 
The operculum horny, thick, annular, rounded behind, rather acute in front, with the nucleus near the 
middle of the outer side, the inner surface callous, with a large scar. 
Tritonium Chemnitzii. 
Murex argus. Var. Chem. x./. 1322. 
Shell ovate, fusiform, ventricose, thin, cancellated, pale yellow, with narrow brown spiral lines; whorls 
rounded, slightly concentrically plaited, and with narrow, simple, and broad grooved subnodulose spiral ribs. 
Mouth ovate, outer lip with ridges in paiis, inner lip thin, ridged, with many elevated transverse ridges in 
front ; canal rather elongated. 
T his shell, like Triton clandestinum, has only one varix ; it is somewhat like T. cingulatum and T. Tran- 
quebaricum, but differs in the lips and the convexity of the whorls. 
Tritonium c a n c e l l a t u m . 
Shell ovate, conical, elongated, pale yellow or white, rather thick, cancellated, subnodose ; spire rather 
longer than the mouth ; whorls rounded, slightly longitudinally plaited and spirally striated, behind sub- 
angular. Mouth small, outer lip largely and equally toothed ; inner lip smooth, with four or five close 
ribs in front. Axis 1 inch. 
Inhab. 
Tritonium Foxii. 
Shell ovate, conical, white, rather thin, spotted with pale brown ; spire nearly as long as the mouth ; 
whorls rounded, with alternate minute, even, and larger nodulose spiral ribs ; behind subangular nodulose; 
throat white, outer lip subnodose in front ; inner lip smooth, concave, with two or three slight plaits in front. 
Axis lj inches. 
Inhab. Pacific Ocean. 
Tritonium vitreum. 
Shell ovate, turreted, white, transparent, finely spirally striated, and concentrically wrinkled ; spire 
acute, rather longer than the mouth ; whorls rounded, varices laminar, radiately striated, with the edge cre- 
nated and reflexed. Mouth ovate, throat smooth, inner lip smooth, produced, laminar and elevated, canal 
slightly recurved. Axis If inch. 
Inhab. 
