PECTEN. 285 



P. tigrinus, M idler. 



Decidedly broader than long, with or without radiating folds, 

 never echinated ; one of the ears almost rudimentary. 



Plate LI. fig. 8 to 11. 



Pecten tigrinus, Muller, Zool. Dan. pi. GO, f. 6, 7, 8. — Alder, Cat. Moll. 



Northumb. and Durham, p. 77. — Desh. Anim. s. Vert. vol. 



vii. p. 155. — Loven, Index Moll. Scandinav. p. 31. 

 „ obsuletus, Penn. Brit. Zool. ed. 4, vol. iv. p. 102, pi. 61, f. 66. — Donov. 



Brit. Shells, vol. i. pi. l,f. 2. — Mont. Test. Brit. p. 149, and 



Suppl. p. 57.— Turt. Dithyra Brit. p. 213, pi. 9, f. 6.— 



Fleming, Brit. Anim. p. 385. — Macgilliv. Moll. Aberd. p. 



226. — Brit. Marine Conch, p. 118. — Brown, Illust. Conch. 



G. B. p. 72, pi. 24, f. 6. — Sowerby, Thesaur. Conch, vol. i. 



p. 71, pi. 14, f. 74, 75, 79. — Hanl. Recent Shells, vol. i. 



p. 282, pi. 10, f. 37. 

 „ Icevis, Pennant, Brit. Zool. ed. 4, vol. iv. p. 102. — Mont. Test. Brit. 



(not Suppl.) p. 150, 579, pi. 4, f. 1.— Turt. Dithyra, Brit. p. 



212.— Brit. Marine Conch, p. 117. — Brown, Illust. Conch. 



G.B. p. 72, pi. 24, f. 7. 

 ,, parvus, Da Costa, Brit. Conch, p. 155. 

 Ostrea tiyrina, Gmelin, Syst. Nat. p. 3327. — Dillw. Recent Shells, vol. i. 



p. 258.— Index Testaceolog. pi. 10, f. 26. 

 Pecten domesticus, Chemn. Conch. Cab. vol. xi. p. 261, pi. 207, f. 2031 to 203G. 

 Ostrea obsoleta, Maton and Rack. Trans. Linn. Soc. vol. viii.p. 100. — Turt. 



Conch. Diction, p. 133. — Dillw. Recent Shells, vol. i. 



p. 263.— Index Testae, pi. 10,f. 37.— Mawe, Linn. Conchol. 



pi. 14, f. 6. 

 „ Icevis, Maton and Rack. Trans. Linn. Soc. vol. viii. p. 100, pi. 3, 



f. 5. — Dillw. Recent Shells, vol. i. p. 263. — Index 



Testaceolog.pl. 10, f. 38. 

 Pecten Armoricanus, Chenu, 111. Conch. Pecten, pi. 39, f. 1, 2, 3. 



As this shell exhibits the strange phenomenon of being 

 sometimes smooth, at other times most distinctly ribbed, 

 it was naturally divided into two or more species at a 

 period when, the conchological fauna of North Britain 

 being but little known, the Pecten tigrinus was considered 

 one of our scarcest shells. The zealous labours of many 

 naturalists in the Northern portion of our Islands, and the 



