MALACOZOA. GASTEROPODA. PECTIN IBRANCHIATA. 145 



breadth about a fourth less. Broader in proportion to its 

 length than the last variety, and with the turns less convex. 



Found by me, in August, 1842, among shell sand, on the 

 beach, between the Dee and the Don ; and in September on 

 Algae, alive. 



Phasianella bifasciata. Brown, Illustr. PL 46. f. 44, 45. 



C. L. varidbilis unicolor. One-coloured. 



Shell ovate, the last turn generally thick, sometimes thin, 

 and of a reddish or yellowish-grey or brown tint. 

 Turbo canalis. Mont. Test. Brit. 309. PL 12. f. 11. 



2. Lacuna fascidta. Banded Round Lacuna. 



Shell subglobose, broader than long, with the spire depressed, 

 of three very thin, transparent, rapidly enlarging volutions, 

 which are glossy, faintly striated transversely, distinctly sepa- 

 rated by a rather deep suture ; the last turn extremely large, 

 with four white and three reddish-brown bands, the middle 

 brown band broader, and sometimes separated into two by a 

 pale line ; the mouth roundish, with the peristome thin and 

 whitish ; a deep and wide groove from the umbilicus, margined 

 by the slightly reflexed columellar margin. 



Very similar in texture and colouring to Lacuna vincta or 

 quadrifasciata, but differing entirely in its form, which resem- 

 bles that of Helix aspersa. 



Adams, Linn. Trans, v. PL 1. f. 20, 21. Helix fasciata. Mont. 

 Test. Brit. 446. Phasianella fasciata. Brown, Brit. Sh. PL 46. 

 f.54. 



3. Lacuna paU'idula. Pallid Lacuna. 



Shell semiovato-globose, subconical, thin, sub diaphanous, of 

 four whorls, with the spire very short, the suture distinct and 

 having the margin of the turns sloping toward it, the last whorl 

 disproportionately dilated, convex, smooth, glossy, somewhat 

 striated transversely ; the mouth roundish-ovate, the peristome 

 thin, the inner lip extended somewhat in the manner of a 

 Nerita, but forming behind a wide groove continuous with the 

 large pillar-cavity ; the colour yellowish-grey, olivaceous, or 

 pale yellowish-brown, the columellar space white. Length 

 two-twelfths and a-half, breadth three-twelfths. 



This shell has a remarkably close resemblance to Velutina 

 striata in its form. 



Found by me, in August, 1842, on the sands at Aberdeen ; 

 in September by Mr. Alexander Murray, on the beach of St. 

 N 



