144 GASTEROPODA. PURPURADZ. 
series (the middle ones smallest), arranged alternately one and 
two. 
Inhabits the British sea on the coasts of Devon, Cornwall, 
and the northern coasts of Scotland. 
5. CERITHIUM SPENCERIANUM. 
C. testa glabra ; anfractibus costis simplicibus obliquis sculptis. 
Habitat in mari Danmoniensi occidentali profundo rarissimé. 
Alt. & une. : 
Shell on the whorls sculptured with simple oblige ribs. 
Height five-eighths of an inch. 
This new species was discovered by Mr. Spencer in deep 
water off Torquay; I have seen no living specimens ; the co- 
lour without the epidermis is dirty white. 
6. CERITHIUM ELEGANTISSIMUM. 
C. testa alba, semitransparente, glabra; anfractibus costis sim- 
plicibus rectis sculptis. 
Helix elegantissima, Walk. Test. Min. Rar. f. 39; M. & R. 
Trans. Linn. Soc. viii. 209. 
Turbo acutus, Donov. Brit. Shells, v. t. clxxviu. f. 3. 
Turbo elegantissimus, Mont. Test. Brit. 298. t. x. f. 2; Flem. 
Edinb. Encycl. vii. 73 ; Dill. Desc. Cat. 146 ; Turt. Conch. 
Dict. 209. 
Habitat in Danmoniz et Cornubie mari profundo, rarissimé. 
Alt. + une. 
Shell white, transparent, smooth; the whorls sculptured 
with simple straight ribs. Height one-quarter of an inch. 
This most elegant species was first found by Mr. J. Cranch 
off Falmouth in deep water; it has since been found rather | 
plentifully at Torquay in Devon by Mr. Spencer of Torquay. 
