108 
MOLLUSCOUS ANIMALS. 
STRUTHIOLARIA. 
The tentacles are subulate on each side of the base of the thick elongated conical trunk ; the eyes are 
placed on short pedicles near the outer base of the tentacles; the foot short, peduncled, not folded. The 
gills are formed of very fine thread-like fibres ; there is a groove and a slight tubercle on the side of the 
right tentacles ; the operculum is very small, horny, ovate lanceolate, with an elongated conical tip in front. 
The animal is very like the animal of Aporrhais in form and character, and justifies the position which 
I had long ago proposed for the shell, next to Rostellaria , before I knew the animal. 
STRUTIIIOLARIA MICROSCOPICA. n. S. 
Shell ovate, conical, whitish, with a narrow brown central band ; whorls rounded, with two very in- 
distinct keels ; suture crenulated ; the outer lip margined externally, with two large teeth on the outer edge, 
one in the middle, and the other in front near the siphon. 
Inhab, Indian Ocean. Paris Museum. 
FHOS, Montfort. 
The tentacles are high up, very long and slender, placed close together at their base ; with the eyes 
placed near their tips, which are rather slender beyond them ; the foot is peduncled, expanded ; the penis 
is very long, slender, subulate; the respiratory siphon is elongated ; the operculum is small, ovate, horny. 
The shells of this genus have been confounded with Nassa and Cancellaria, but they differ from both 
in having a sinus in the front of the outer lip, like the Strombiclce, and in the front of the pillar having a single 
sharp marginal plait. 
The species are numerous ; I have at least ten in my possession. The genus Cyllene chiefly differs from 
this in having a groove extending up the suture like Oliva. 
Ml HEX. 
The tentacles cylindrical, with the eyes placed within one-third of the top, and the tip above the eyes 
very thin and slender. (M. Pomum.) 
Murex vitulinus, t. 33./. 4. 6. Lam. E. M. 319./. 1. 
Murex militaris. Gmel. 35, 36. 
Murex purpura scabra. Chem.f. 1832-33. 
Murex salebrosus. King, Zool. Jour. v. p. 347. 
The specimens brought by this expedition are larger than those formerly in the collections ; they do not 
differ in any character of importance, and certainly can only be regarded as a local variety. 
Murex brassica, t. 33./. 1. Lam. Hist. vii. 167. 
Murex ducalis. Brod. and Sow. Zool. Jour. iv. 377. 
Inhab. Pacific Ocean. 
I have compared this shell with Lamarck’s own specimen, in the collection of the Prince Massena, and 
it agrees with the one here figured in every particular ; that it is the shell he described is proved by its having 
the name written on it by Lamarck himself. 
