346 
MOLLUSCA. MURICID^. 
Tekebka. 
MURICIDJE. 
a. Right lip simple. 
b. PiUar plaited. 
(Turbinella.) 
(Fasciolaria.) 
Terebra. ' 
hh. Pillar simple. 
Pyrula. 
Fusus. 
Pleurotoma. 
aa. Right lip marginated by the last formed of the varicose ribs. 
b. Ribs continuous over the whorls. 
(Ranella.) 
Murex. 
Typhis. 
bh. Ribs interrupted. 
Triton. 
Gen. LXXVII. TEREBRA. — Shell turrited, long in pro- 
portion to the aperture ; canal short, the pillar twisted, or 
turning obliquely to the left. 
323. 'T.Jhscata. — ^Whorls twelve, with three or four spiral 
tuberculated ridges ; base spirally striated. 
Bucc. fuscura, List. Conch, t. cxxii. f. 18 — Murex fuse. Linn. Syst. i. 
1225.-— Turbo tubercularis, Penn. Brit. Zool. iv. 129. t. Ixxxii. f *111. 
— Murex fuscatus, Pult. Dorset. 43. Mont. Test. Brit. 269.— English 
coast, rare. 
Length an inch and a half, breadth y'^ths ; brown ; whorls flat, increasing 
gradually ; separating line with a spiral fold above it ; spiral ridges unequal ; 
some tubercles of the middle ridge, at irregular distances, swollen, the fur- 
rows minutely striated spirally, and finely wrinkled by the layers of growth ; 
striae flattened ; base crenulated ; aperture longitudinal ; pillar smooth, ca- 
nal short and shallow — I have given the above description from specimens 
sent me as English by Dr Leach. I am at a loss, however, to comprehend 
the nature of the shell which the authors of the descriptive catalogue have 
figured in Linn. Trans, viii. t. iv. f. 6. It is surely unconnected with this 
species. 
324. T. tubercularis. — Whorls ten, with three series of spi- 
ral tubercles of equal size ; the canal partly covered by the in- 
cumbent pillar lip. 
Murex tub. Mont. Test. Brit. 270.— South coast of England. 
Length a quarter of an inch ; chesnut-brown ; whorls slender, tapering, 
separated only by a slight depression ; apex pointed ; aperture small, oval. 
—A white variety occurred to Mr Laskey at Dunbar. 
325. T. reticulata. — Whorls twelve, with four spiral ridges 
intersected by slightly oblique longitudinal furrows. 
