23 



514 Mytilus ung-ularis 



515 edulis. (a. b.) distortions 



PIJVJVA. 



516 Pinna rudis 



517 • • Flabellum 



518 semi-nuda 



519 nobilis 



520 ■ • squamosa 



521 — muricata 



522 marginata 



523 pectinata 



524 saccata, several varieties 



525 dolabrata, three strong varieties in form 



526 inflata, Chemn. viii. t. 87, f. 772 



627 ■ nigrina 



528 incurvata, Chemn. viii. t. 90, f. 778 



529 bicolor, Chemn. viii. t. 90, f. 780, rotun- 



data, Lin. ? 



530 var. 



531 sermte (Humphrey.) 



531« atro-purpurea 



crejvatuIa. 



532 Crenatula avicularis 



533 nigrina ? ; 



634 mytiloides 



535 Phasianoptera 



PERNA, 



536 Perna Ephippium 



536a- var. albida 



537 obliqua 



538 Isognomum 



539 femoralis 



640 Marsupium 



