TROCHUS.—Ptrate VII. 
squamatis, squamis validis, erectis, basi dense imbri- 
catd, callo circa umbilicum intense purpureo-roseo. 
Tur RED-MouTH TrocHUs. Shell imperforate, conical, 
white; whorls sharply sloping, obliquely rudely pli- 
cately wrinkled, sharply angled at the margin, en- 
circled with two rows of strong erect spine-scales ; 
base densely imbricated, callosity around the umbi- 
licus deep purple-rose. 
Lamarck, Anim. sans vert. vol. v. p. 127. 
Hab. Island of Tortola, West Indies. 
Encireled with a double row of unusually erect spine- 
like scales, but mainly distinguished by the callosity around 
the umbilicus being of a deep purple-rose or lake colour. 
Fig. 36. (Mus. Cuming.) 
This shell I had regarded as a distinct species from the 
preceding ; but notwithstanding its very different aspect, 
Tam forced to the conclusion that it is only a variety in 
which the rude oblique plicated wrinkles are broken up 
into grains, and the basal scales are reduced to the simplest 
possible form of development. The imbricated base, with 
its deep purple-lake callosity, is the same. 
Species 37. (Mus. Cuming.) 
TrocHts rmBricatus. Tvoch. testé imperforatd, acute 
conoided, livido-albd ; anfractibus convexo-declivibus, 
undique validé angusté squamato-costatis, costis medio 
interruptis, ad marginem acuté descendentibus ; basi 
rugoso-striati. 
THE IMBRICATED TRocuUs. Shell imperforate, sharply 
conoid, livid-white; whorls convexly sloping, every- 
where strongly narrowly squamately ribbed, ribs in- 
terrupted in the middle, sharply descending at the 
margin; base rugosely striated. 
GMELIN, Syst. Nat. p. 3581. 
Hab. West Indies; Honduras. 
Always remarkable for the very prominently descending 
| character of the scale-ribs. 
