22 



HIPP OPUS. 



488 Hippopus niaculatus; a magnificent series of 



nine specimens 



MODIOLA. 



489 Modiola Papuana 



490 Tulipa 



491 albicostata, varieties 



492 i)i(ta 



493 snlfata 



494 plicatula, (a) var. inairva 



495 somi-fusca? two specimens, each hav- 

 ing one valve polished 



496 securis 



49Ga var. 



49/ discrcpans 



498 discors; several detached specimens, 



and a large group in the byssus 



499 trapezina 



500 plicata 



500a 



MYTILUS. 



501 Mytilus Magellanicus 



502 crenatus, (anracrevarictasprfecedentis) 



503 hirsutus 



504 bilocularis, many varieties in shape 



505 elongatus, several specimens 



506 latus 



507 zonarius, both valves polished 



508 ungulatus 



509 vidlaccus 



510 Opalus 



511 sniaragdinus 



512 Afcr 



513 achatinus 



