LAMELLARIA. 355 



L. PERSPicuA, Linnseus. 

 Shell more convex than in tentaculata. 



Plate XCIX. fig. 8, 9, and (Animal) Plate P P. fig. 1. 



Helix perspicua., Linn. Syst. Nat. ed. 12, p. 1250. 



Bulla Haliotoidca, Mont. Test. Brit. p. 211, pi. 7, f . 6 ; and vol. ii. vign, f. 6, 

 animal. — Maton and Rack. Trans. Linn. Soc. vol. viii. 

 p. 123. — Rack. Dorset Catalog, p. 43, pi. 22, f. 5*.— 

 TuRT. Conch. Diction, p. 24, 

 Siyardus Neritoideus, Delle Chiaje, Memorie Anim. s. Vert. vol. iii. pi. 47, 

 f. 6, 7. 

 „ Haliotoideus, Fleming, Brit. Anim. p. 360. — Brown, lllust. Conch. 

 G. B. p. 23, pi. 2, f. 1, 2. —Gould, Invert. Massach. 

 p. 244, f. 158— Dekay, New York Moil. p. 153. 

 „ Kindelianus, Michaud, Bullet. Linn, Soc. Bordeaux, 1828, p. 120 

 (f. 2), copied. Ferus. Bull. Sc. Nat. vol. xvii. p. 308. 

 „ joe/-s/;/cM«s, Philippi, Moll. Sicil. vol. i. p. 165, pi. 10, f. 5; vol. ii. 

 p. 142.— Brit. Marine Conch, p. 154, f. 77. 

 Oxinoe glabra, Couthouy, Bost. Journ. Nat. Hist. vol. ii. pi. 3, f. 16. 

 Coriocella perspicua, Kuster. Chemn. Conch. Cab. (ed. Kust.) vol. vi. pi. 2, 



f. 5, 6. 

 Lamellaria „ Alder, Cat. Moll. Northumb. and Durh, p. 70. 



No difficulty can arise in distinguishing this Haliotis- 

 shaped shell from any species of the British Fauna (the 

 next excepted) ; but the discrimination of it from its 

 foreign congeners is a task of far more uncertainty, and 

 one in which he who essays it will be more aided by the 

 pencil of the artist (for it is almost impossible, at least 

 without verbosity, to express and define with accuracy the 

 modifications and proportions of form) than by the pen of 

 the describer. 



The shell is very thin, nearly transparent, and of a 

 shining, snowy whiteness ; although smooth, it is conspi- 

 cuously marked with numerous fine wrinkles of increase, 

 which are chiefly apparent beneath the sutures. The 

 shape is nearly oval, and somewhat oblique ; it is com- 



