346 MOLLUSCA. MURICID/E. Tkrebra. 



MURICID./E. 



a. Right lip simple. 



b. Pillar plaited. 

 (Turbinella.) 

 (Fasciolaria.) 

 Terebra. 



lib. Pillar simple. 

 Pj^rula. 

 Fusus. 

 Pleurotoma. 



aa. ltight lip marginated by the last formed of the varicose ribs. 

 b. llibs continuous over the whorls. 

 (Ranella.) 

 Murex. 

 Typhis. 



lb. 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.fuscata. — Whorls twelve, with three or four spiral 



tuberculated ridges ; base spirally striated. 



Bucc. fuscum, List. Conch, t. cxxii. f. 18 — Murex fuse. Linn. Syst. i. 

 1225. — Turbo tubercularis, Penn. Brit. Zool. iv. 129. t. lxxxii. f. *111. 



—Murex fuscatus, Pult. Dorset. 43. Mont. Test. Brit. 2C9 English 



coast, rare. 



Length an inch and a half, breadth T 4 „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. 



