430 patellidjE. 



vol. ii. p. 37. — Macg. Moll. Aberd. p. 1 82. — Brit. Marine 

 Conch, p. 131.— Brown, 111. Conch. G. B. p. G4, pi. 20, f. 2, 

 3,7,8, 11.— Strom. Acta Nidros. vol. iv. (1768).— Mul- 

 ler, Zool. Dan. pi. 104, f. 1 to 4. — Born, Testae. Mus. Cses. 

 pi. 18, f. 9.— Chemn. Conch. Cab. vol. x. p. 330, pi. 168, 

 f. 1620.— Dillw. Recent Shells, vol. ii. p. 1042.— Lam. 

 Anim. s. Vert. (ed. Desh.) vol. vii. p. 540. — Wood, Index 

 Testae, pi. 37, f. 58.— Desh. Encyc. Meth. vol. iii. p. 710.— 

 Sowerby, Man. Conch, f. 230. — Hanl. Conch. Book Spec, 

 p. 6. 

 Patella lesvis, Penn. Brit. Zool. ed. 4, vol. iv. p. 143, pi. 90, f. 151. — Turt. 

 Conch. Diction, p. 137 (not var. bimaculata). — Flem. Brit. 

 Anim. p. 286. — Johnston, Berwick. Club, vol. ii. p. 37. — 

 Macg. Moll. Aberd. p. 182. — Dillw. Recent Shells, vol. ii. 

 p. 1043 (not var.) 

 Blue rayed limpet, Humphreys and Da Cos. Nat. Hist. Shells, pi. 4, f. 4. 

 J'atr/la cceruleata, Da Costa, Brit. Conch, p. 7, pi. 1, f. 5, 6. 



„ bimaculata (young), Mont. Test. Brit. vol. ii. p. 482, pi. 13, f. 8. — 



Maton and Rack. Trans. Linn. Soc. vol. viii. p. 235. 

 „ cesrulea, Mont. Test. Brit. Suppl. p. 153. — Flem. Edin. Encycl. pi. 204, 

 f. 1. — Forbes, Malac. Monens. p. 36, animal. — Brown, 111. 

 Conch. G. B. p. 64, pi. 20, f. 13.— Wood, Index Test. pi. 37, 

 fig. 59. 

 „ elongata and elliptica, Flem. Encyc. Edin. pi. 204, f. 2, 3. 

 „ cornea, Potiez and Mich. Gal. Douai, Moll. p. 525, pi. 37, f. 5, 6. 

 Acmes a pellucida, Brit. Marine Conch, p. xxxii. 



The two varieties of this elegant Limpet differ so re- 

 markably from each other, as strikingly to illustrate the 

 effects of food and habitat upon colour and solidity. The 

 more typical pellucida feeds upon the leaves of the Fuel, 

 the aberrant Icevis upon the roots and stalks, in which in- 

 deed it is wont to imbed itself. The former is thin, semi- 

 transparent, of a dark olive when adult, of an ochraceous 

 yellow when young, is regular in shape, which ranges from 

 subelliptic to rounded ovate — for, as in most Limpets, the 

 shape tapers a little behind — and is adorned with more 

 or less interrupted linear rays of lustrous Mazarine blue, 

 that vary greatly both as to number and approximation. 

 The latter form is a much stronger shell, very irregular in 

 shape, yet generally pinched up, as it were, at the sides 



