PLATE IX. 



Pecten. Free, except 1. 

 Fig. 



1. P, pusio. Pennant, {Ostrea.) — P., 0., and ITinniles distortus and 



sinuosus. — Brit. co. generally, 15 to 90 fath., C. Irregular, 

 attached to stones, etc. 



2, 3. P. VARius, Linn, (Ostrea.) — P. monotis. — Brit. co. generally, 



3 to 35 fath.; C. Vertically elongate ; auricles very unequal. 



4. P. NiVEUS, Macf/UUvray.— BcoWsxii, R. (15 fath.) Ribs more nu- 



merous than P. varius ; white. 



5, 6, 7. P. OPERCULA.RIS, Linn. [Ostrea.) — 0., and P. suhnifus, pic- 



tus, lineatus (var. f. 6), and sanguinea. — Brit. co. generally, 5 to 

 100 fath., C. As broad as long; ribs rounded. 



8. P. AuDOUiNii, Payraudeau. — P. opercularis, var., B. Moll. — Ribs 



angular and squamose. 



9, 10. P. DANicus, Chemn. — P. and 0. pes-felis, ylaher, triradiata, ad- 



spersus, septemradiata, etc. — Several Scotch localities, 25 to 90 

 fath., Mc. Very variable, extreme vars. f. 9, 10. Auricles more- 

 equal than P. tigrinus. 

 11, 12. P. TiGRiNTJS, Mailer. — P. ohsoletm, domesticus, leevis, parvus, 

 etc. — Brit. co. generally, 12 to 60 fath,, C. Variable ; one auricle 

 minute, the other large and ribbed. 



13. P. MAXiMUS, Lin)i. (Ostrea.)— P. vulgaris. — Brit. co. generally, 3 



to 40 fath. The common eatable Scallop. Valves unequal. 



14. P. siMius, LasJcey. — 0. and P. tumidus. — Pr. Perth, Isl. Man, 



Lerwick, Cape Clear, etc., Mc. Minute, smooth, with undula- 

 ting marks. 



15. P. sTRiATUs, Mailer, — P. aculeatus,fuci, etc. — Scotland, C, ; Eng- 



land, R. 



16. P. FURTivus, Loven. — Zetland, Guernsey, etc., 40 to 50 fath., Mr. 



More rounded, and with auricles less broadly based than P. stri- 

 atus. 



HiPPOTHYRis. Fixed by byssus. 



17. H. PSITTACEA, Gmel. (Anomia.) — A. rostrnm-psi ttaci, Cham. ; Tere- 



Iratula psiftacea, — Northumberland, Fr. Forth j deep water, 

 Rr. as Brit. " The Parrot' s-beak Anomia." 



Terebratula. Fixed by byssus. 



18. T. cranium. Mailer. — Anomia c., and T, viirea, — Zetland; deep 



water, unique as Brit. Smooth, oval. 



19. T. capstjla, Jeffreys, Ann. Nat. Hist., Jan. 1859. — Belfast Bay, 



R. Minute, punctured. 



