248 PATELLID.E. 



I5 inch long, and one fonnd by ^Nlr. IMacdonald in tlie 

 Moray Filth is a trifle longer ; in North America it 

 even exceeds these dimensions. Dr. AVallich procured 

 bright-coloured specimens at depths of from 50-150 f. 

 off Godhaab in East Greenland. 



A less distinctly striated form is the Patella testudi- 

 naria of Miiller, although not of Linne; and the young 

 is the P. tessulata or tessellata of the fii'st-named author. 

 It is likewise the P. Clealandi of Sowerby^ P. clypeus 

 of Brown, P. amoena of Say^ and P. Clealandiana of 

 Leach. The P. Clealandi of Conch, from Gorran, in 

 Cornwall, appears to have been only a white variety of 

 T. virginea. 



2. T. viRGi'xEA*, Miiller. 



Patella virginea, Miill. Prodr. Z. D. p. 237. Acmcsa virginea, F. & H. 

 ii. p. 437, pi. Ixi. f. 1, 2. 



BoDT milk-white or pale yellowish-white, faintly suffused 

 with piuk : mantle thick, fringed with unequal filaments 

 a httle within the margin, where it is banded with pink 

 at intervals corresponding to the coloured rays on the shell : 

 head having a rosecolour tinge, very short, broad, and semi- 

 circular, furnished with a lappet on each side : tentacles rather 

 long, contractile, and cihated : eyes small : gill-plume falciform, 

 of the palest drab, coarsely pectinated, also contractile and 

 cihated : foot roundish -oval, smooth, delicately veined with 

 white. 



Shell most commonly depressed, more or less soHd, according 

 to habitat (specimens from the laminarian zone being thinner 

 than those found between tide-marks), opaque, somewhat 

 glossy : sculpture, numerous fine thread-hke striae which ra- 

 diate from the beak ; these, however, are often indistinct and 

 apparently wanting ; concentric striae and marks of growth 

 as in T. t^studinalis : colour yellowish-white, with a pinkish 

 tinge and from 16 to 20 pink or brownish longitudinal rays, 

 which are rather broad, and are occasionally interrupted or 

 spotted with white, so as to give an appearance of coloured 



* Maidenlv, or graceful. 



