INDEX OF GENERA. 



51 



Planaxis 8 c 



Planorbis 17 c 



Pleurotornidas 2 c-2 e 



Plicatula 25 n 



Proserpina 10 c 



Pterocera 9 <5 



Pteropoda 1 d 



Puncturella 11 e 



Pupa 16 G 



Purpura 3 G-3 H 



Pyramidellidse 6 g 



Ranella 6 a-6 b 



Ringicula 6 a 



Rissoidaa 8 c 



Rocellaria 20 d 



Rostellaria 9 h 



Rotella 10 c 



Saxicava 20 d 



Scalaria 6 f 



Scaphander 12 e 



Scintilla 20 G 



Scutus 11 D 



Semele 19 a 



Sepia 1 c 



Septifer 23 e 



Siliquaria 9 E 



Siphonai-ia 17 d 



Sistrum . . 4 A 



Solarium 6 H 



Solemya 20 G 



Solenidaa 20 d-20 f 



Sphajriurn 18 E 



Spirula 1 c 



Spondylus 24 h-25 b 



Stilifer 6 n 



Storaatella 11 b 



Streptaxis 12 G 



Strombus 9 e-9 g 



Strophia 16 u 



Struthiolaria 7 e 



Succiuea 17 a 



Sunetta 17 e 



Sycotypus 2 f 



Tapes 18 b 



Tellinidae 18 e-19 b 



Terebellum 9 H 



Terebridoe 2 A-2 c 



Teredo 20 c 



Testacella 12 g 



Thracia 19 f 



Trichotropis 7 e 



Tridacna 20 A-20 b 



Trigonia 23 e 



Triton 6 b-6 d 



Trochidte 10 f-11 b 



Trophon 3 a 



Truncatella 8 b 



Tugonia 20 f 



Turbinellidaj 5 b-5 c 



Turbinidas 10 c-10 e 



Turritella 8 n-9 A 



Umbrella 12 f 



Ungulina 21 a 



Unionida? 21 e-22 g 



Valvata 9d 



Vanicoro 9 d 



Yelutiua <> d 



Veuerupis 18 c 



Venus 17 n-18 A 



Verrnetidai 9 d-9 e 



Vitrina 12 n 



Volutidas 5 c-5 f 



Vulsella 24 ii 



Xenophora 9 n 



Yoldia 23 ii 



