22 



HIPPOPUS. 



488 Hippopus maculatusj a magnificent series of 



nine specimens 



MODIOLA. 



489 Modiola Pap nana 

 490 Tulipa 



491 albicostata, varieties 



492 picta 



493 sulcata 



494 plicatula, (a) var. incurva 



495 semi-fusca? two specimens, each hav- 

 ing one valve polished 



496 securis 



496a var. 



497 discrepans 



498 discors; several detached specimens, 



and a large group in the byssus 



499 trapezina 



500 plicata 



500a 



MYTILUS. 



501 Mytilus Magellanicus 



502 crenatus_, (anmerevarietaspraecedentis) 



503 hirsutus 



504 bilocularis, many varieties in shape 



505 r elongatus, several specimens 



506 — — — latus 



507 zoiiarius, both valves polished 



508 ungulatus 



509 violaceus 



510 Opalus 



511 smaragdinus 



512 Afer 



513 achatinus 



