23 



514 Mytilus ungularis 



515 edulis. (a. h.) distortions 



Plj\j\A. 



516 Pinna rudis 



517 Flabellum 



518 senii-nuda 



519 nobilis 



520 squamosa 



521 niuritata 



522 raarijinata 



523 jiertinata 



524 saccata, several varieties 



525 dolabrata, three strong; varieties in form 



526 inflata, Clicmii. viii. t. 8", f. 772 



52" nigrina 



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



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



data, Lin? 



530 var. 



531 serrata (Humphrey.) 



531« atro-purpurca 



CRENATULA. 



532 Crenatula a\ ioularis 



533 nigrina ? 



534 niytiloidcs 



535 Pliasianoptcra 



PER.NA. 



536 Perna Ephippium 



536« var. albida 



537 obliqua 



538 Isognomum 



539 femoralis 



540 Marsupium 



