GASTEROPODA. PURPURADZ. 143 
Linn, Soc. viii. 150; Flem. Edinb. Encycel. vii. 78; Dill. 
Dese. Cat. 745; Turt. Conch. Dict. 96. 
Habitat in mari Cantiano. Alt. + unc. 
Shell chestnut-brown, with ten transversely ribbed whorls ; 
the ribs tuberculated ; the tubercles equal, arranged in a triple 
series ; the interstices reticulated. Height half an inch. 
Inhabits the sea on the coast of Kent. 
3. CERITHIUM SUBULATUM. 
C. testa albida; anfractibus quindecim, transversim tuberculatis ; 
tuberculis eequalibus, in serie triplici dispositis, linea lata 
spirali impressa divisis. 
Murex subulatus, Mont. Test. Brit. Supp. 115. t. xxx. f. 6; 
Flem. Edinb. Encycl. 77; Dill. Desc. Cat. 145; Turt. 
Conch. Dict. 96. 
Habitat in mari Caledoniensi occidentali rarissimé. Alt. 3 une. 
Mus. Montagu in Brit. Mus. 
Shell white, with fifteen transversely tuberculated whorls ; 
the tubercles equal, arranged in a triple series, divided by a 
broad impressed line. Height half an inch. 
This species is found very rarely in the western sea of Scotland. 
4, CERITHIUM ADVERSUM. 
C. testa heterostropha, opaca, fuscescente ; anfractibus undecim, 
transversim tuberculatis ; tuberculis in serie triplici (mediis 
minoribus) uno et duobus alternatim dispositis. 
Murex adversus, Walk. Test. Min. Rar. f. 48; Adams Micr. 
Ess. t. xiv. f. 21; Mont. Test. Brit. 271; M. & R. Trans. 
Linn. Soc. viii. 151; Flem. Edinb. Encycl. vii. 78; Dill. 
Desc. Cat. 758; Turt. Conch. Dict. 97. 
Turbo punctatus, Turt. Linn. iv. 501. 
Habitat in mari, Danmoniensi, Cornubiensi et Caledoniensi 
Boreali. 
Shell heterostrophe, opaque, pale fuscous-brown, with eleven 
transversely tuberculated whorls; the tubercles in a triple 
