48 ' MOLLUSCA. TRACHELIPODA. 



feriorly, subperforate at the base, and furnished with three 

 transverse plaits. 



P. dolabrata, Lam. (Trochus, Lin.) Shell subconical, turreted, 

 glabrous and umbilicated, smooth, white, circled with yellowish 



lines ; pillar with three plaits ; outer lip ribbed. 1 inch long 



D'Argenv. pi. 11, fig. L. 



Gen. 49- TORNATELLA, Lam. Valuta, Lin. 

 Shell convoluted, oval-cylindrical, in general striated transverse- 

 ly, and destitute of epidermis ; aperture oblong, entire, with 

 the margin edged ; one or many folds on the columella. 



T.Jlammea, Lam. Shell ventricose, transversely striated, white, 

 with longitudinal waved red bands ; spire conoidal ; pillar with 

 one fold. 1J inch long Lister, pi. 814, fig. 24. 



r E.fasciata,~L&m. (V.tornatilis, Lin.) Shell ovate, finely striated 

 transversely ; spire elevated, rather acute ; aperture narrow ; pil- 

 lar with one fold ; colour pale red, with two white bands on each 



spire, f inch long. Inhabits European coasts. B Browns 



Illust. pi. 51, fig. 4, 5. 



Fossil species of this genus are found in the London clay and oolite. 



FAMILY IV. MACROSTOMA. 



Shell auriform, with the aperture very wide, and the margins 

 disunited ; no columella nor operculum. 



The shells of this family are nacreous or pearly, depressed, and not operculated. 



Gen. 50. HALIOTIS, Lin. 



Shell auriform, generally flattened ; the spire very short, some- 

 times depressed, almost lateral ; aperture large, longer than 

 broad, entire in its perfect state ; disk pierced with holes dis- 

 posed in a line parallel to the left margin, the last commen- 

 cing by a notch. 



The species of this genus are known by the name of Ear-shells, from their resem- 

 blance in form to the cartilage of the human ear. The Haliotides have no opercu- 

 lum. In repose they adhere to rocks like limpets. They are always found near the 

 shore, and crawl in the fine nights of summer to pasture on the vegetation along the 

 beach. As the animal increases in size, it forms a new hole on the anterior part of 

 the shell. 



H. Midce, Lam. Shell rounded, large, ponderous, the wrinkles of 

 the back longitudinal, waved and inclined ; spire blunt ; the left 

 margin elevated and curved. 5 inches long. Inhabits seas at 

 Cape of Good Hope. Lister, pi. 613, fig. 5. 



This is one of the largest species of the genus. The left margin is remarkably thick ; 

 and when deprived of its yellowish brown epidermis, the shell is found more or less 

 tinged with orange and other colours. The inside is smooth and pearly. 



H. iris, Lam. Shell ovate, convex, ventricose, with obsolete longi- 

 tudinal plaits and transverse wrinkles ; the inside highly irides- 

 cent. 4 or 5 inches long, and two- thirds as broad. Inhabits 

 coasts of New Zealand. Chem. x. pi. 167, fig- 1612, 1613. 



