ACMiEA. 435 



Patella testudinaria Orcenlundka^ Chemn. Conch. Cab. vol, x. p. 325, pi. 168, f. 



IGI4, 1615. 

 Die ScUldkroten-paielle var. h, Kammerer (1786), Cab. Conch. Rudolst. p. 12, 



pi. 2, f. 4, 5. 

 Patella Clealaridi, Sowerby, Trans. Linn. Soc. vol. xi. p. 621. — Fleming, Brit. 

 Anim. p. 287.— Mawe, Introd. Linn. Conch, pi. 32, f. 7. 

 „ ainoena. Say, Journ. Ac. N. S. Philadelph. vol. ii. p. 223. 

 „ clyppus. Brown, 111. Conch. G. B. (edition without text), pi. 37, f. 0, 10. 

 — Forbes, Mag. Nat. Hist. vol. viii. p. 592. 

 Lottia testtidinalis, Forbes, Malac. Monens. p. 34 (animal). — Brown, 111. Conch. 

 G. B. p. 64, pi. 20, f. 9, 10. — Gould, Invert. Massach p. 

 153, f. 12. 

 Patelloida amosna, Couthouy, Boston Journ. Nat. H. vol. ii. p. 171. — Lea, 

 Trans. Americ. Phil. Soc. (new ser.) vol. vii. p. 73. — 

 Dekay, New York Fauna, Moll. p. 162, pi. 9, f. 196. 

 Acmtea testudinalis, Hanley, Brit. Mar. Conch, p. xxxii. f. 103. 



The little tortoise-shell Limpet has an oval or elliptic 

 contour, is either depressed or depressed- conical, and has 

 the surface flattish, and not convex, as in certain allied 

 exotic species. The vertex, which is moderately inclined, 

 is rather acute when not worn, and is more frequently 

 pale-coloured than otherwise. The shell is generally thin, 

 but not transparent, and is merely sculptured by very 

 fine and extremely numerous crowded radiating striae, 

 that are only slightly raised, a little undulating, and very 

 densely, but almost invisibly, decussated by the extremely 

 minute concentric wrinkles, that concentrically traverse 

 the exterior. The painting is very elegant, the external 

 pattern, which is very variable, being effected by a marbling 

 or interlacement of rufous brown of various intensities, 

 with a more or less impure white, so that either tint 

 occasionally predominates. Frequently the brown forms 

 a rather coarse network upon a pale ground, often it is 

 disposed in very wavy and generally commingling streaks, 

 or there is an union of both patterns on the same shell ; 

 more rarely the surface is almost entirely brown, or white, 

 with a few radiating brown lines. Within, the margin 



