Pleurodon 
Polyodonta 
Poromya anatinoides 
granulata 
Poronia rubra 
Potamida 
Potomomya 
Prisodon 
Proptera 
Psammobia affnis 
Dumontii 
Ferréensis 
florida 
levis 
muricata 
tellinella 
vespertina 
Psammocola . 
Psammophila . 
Psammosolen . 
Psammotea 
Pseudamusium 
Psilopus 
Pteria 
Ptychina 
Pullastra 
Puschia 
Pyzis 5 
Quadrula 
Rhomboides 
Rhombus 
Rotundaria 
Sanguinolaria fusca 
Saxicava arctica 
carinata 
distorta 
fragilis 
gallicana 
pholadis 
rhombotdes 
rubra 
"rugosa 
striata 
sulcata 
INDEX. 
Scacchia elliptica 
ovata 
Scalinaria 
Scapharea 
Seaphula 
Scaphura 
Scrobicularia . 
Semele 
Senilia 
Serripes 
Serrula 
Siphonium 
Solecurtus 
Solena 
Solenarius 
| Solen candidus 
curvus . 
ensis 
ensiformis 
gladiolus 
Hausmanni 
ligula 
novacula 
siliqua . 
strigellatus 
tenuis 
Spheenia angulata 
Binghami 
costulata 
cylindrica 
Spherella 
Spharium 
Swainsoni 
Spisula truncata 
Stola 
Strophilus 
Symphynota 
| Syndosmya 
Syntoxia 
Tapes aurea 
perovalis 
texturata 
virginea 
| Taras 
Tellimya 
| Tellina Balthica 
