MOLLVSCS.] NATURAL HISTORY. 493' of the shell, which is permanent through all the varlatiou8 of the outer aurfnce. The inside is pale purplish-brown, with a yel- lowish-white muscular impression. In the older spec?. ens the central disk is often of a pure opaque-white, and the muscular impre?ons round the inner edge of the shell are both pellucid brownish-white; length four inches, breadth three, height two inches. ? shell is abundant on the rocky shure? of King Georg? the ?nlrd's Sound. In the collection there is a worn specimen of another species of this ?enns; but from its bad state, and From the very ?reat con- fusion in which the various species of Patella are involved, I do not venture to describe it as n new shell, although there has not been any hitherto described to which, in its present state, it can with any certainty be referred. It is conical, convex, with twenty. four or twenty-five distinct convex ribs alternately increasing in size; the ?oovee between the fibs are broad, with irregular, ?oncentric, blnck*brown, raised lines, which appear to he caused by' the wearing away of the other pert of the dark outer coat; the inside is white with a brow? disk, and the edge sinouted and furnished with gTooves under the lar?er ribs. 103. HALIOTIS ROSl, (n. 8.) ?'e?a fubeotu*u/a cmtvexiusogl? eugom e? ?lica?a Ii?' ?dcata i? a?.?en?eo e? ?'?o ?rs?a?i?eea , Icon. ? Shell roundish, uther convex; the outside reddish ? brownish, regular; closely but unequully spiral, ribbed, and irre?u�rly and ?ighly concentrically striated end plalted; the row of perfo* rations is rather prominent, and pierced with six or seven moderate* sized, slightly tubular, holes; the inside is iridescent, pearly, tuber wavy, and exhibits two distinct whorls; the column!Is lip i8 short and flattened, outer lip rounded; the spire is convex, uther prominent, placed about one. third of the breadth of the 8hell from the outer lip, and co?iste of three whoriB, which very rapidly en* be.
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