PHYLLOBRANCHIA. TURBONID. 173 
Dill. Dese. Cat. 186; Turt. Coneh. Dict. 189, sp. 7; Lam. 
Hist. Nat. des Anim. sans Vert. vii. 23. 
Habitat in maribus Europe vulgatissimus. Alt. 2 unc. 
Shell thick ; the lines on the whorls spiral, unequally broad, 
smooth, and transversely striolated obliquely. Height two 
inches. 
Animal with its foot, the superior part of the head and the 
region of the mouth yellow. Operculum reddish. 
Very common in the British seas. 
5. TROCHUS IRREGULARIS. 
T. testa crassi; anfractibus lineis irregularibus, spiralibus, ele- 
vatis, non tuberculatis nisi in suturis sculptis. 
Habitat in Danmonize et Cornubize mari profundo. Teste 
color sordidé flavescens, seepius roseo-rubro punctulatus aut 
maculatus. Mus. nost. in Mus. Brit. 
Shell thick ; the whorls sculptured with irregular, elevated, 
spiral lines, only tuberculated in the sutures. Height one inch. 
Colour of the shell dirty yellow, generally punctulated or 
spotted with rose red. 
Inhabits the Plymouth Sound and Falmouth Bay. It has 
doubtless been confounded with 7. ziziphinus, but having com- 
pared a complete series collected by Mr. J. Cranch, from the 
above-mentioned places, from the youngest specimens to the 
full-grown ones, I have been enabled satisfactorily to establish 
it as a new and distinct species. 
6. TROCHUS DISCREPANS. 
T. testa crassa; anfractibus sulco mediano lato et lineis im- 
pressis, angustissimis sculptis. 
Trochus discrepans, Brown, Mem. Wern. Soc. ii. 519. t. xiv. 
fA, 
Habitat in mari Hibernico rarissimé. Mus. D. Varley. Alt. 
lune. Color olivaceo-testaceus ; sulcus medianus fuscescens ; 
anfractus transversim rubro-fasciati. 
Shell thick; the whorl sculptured with one broad middle 
groove and very narrow impressed lines. Colour olivaceous- 
