CONTEN i 8. 



l\ 



8. Potainidea 107 



9. Cerithidea 107 



1). Triphorina, 



10. Triphoria Ids 



Fam. 17. Turritelladte 109 



1. Turritella 109 



2. /aria 110 



3. Torcula 110 



-1. Ejgliaia 110 



5. Mesalia Ill 



Fam. 18. Barleeiadce Ill 



1. Barleeia Ill 



2. Bydrocasna Ill 



Fam. 19. Vivipurida Ill 



1 . Viviparua 112 



2. Rivulina 114 



3. Paludoroua 1 14 



4. Tiualia 114 



5. Bithinia Ill 



u. Plocauobranchia 115 



Fam. 20. Calyptra>ad<2 115 



a. Crcpidulina. 



1. Crepidula 115 



2. Garnotia 11/ 



b. Galerina. 



3. Galerus 117 



4. Trochita 118 



5. Crucibulum 1 18 



c Calyptraina. 



6. Calyptra 119 



Fam. 21. Capulida 119 



1. Capulus 119 



2. Eipponyx 121 



3. Amalthea 121 



Fam . 22 I r an icoroidtc 121 



I. Vanieoro 122 



b. Streptobranchia 12:? 



Fam . 23. Valvatidce 1 22 



I. Valvata 122 



III. Opiaophtbalma 123 



Fam. 24. Acicviad* 123 



1 . Acicula 121 



2. Geomdania 121 



Fam . 25. Rissoelliddi 1 .' j 



1. Rissoolla 121 



2. Ufacgillivrayia 125 



II. Protopoda 126 



Fam. 1. Vermetida 12<> 



;i. Vtrmetina. 



1 . Siphonium 126 



2. Vermetna I2fi 



3. Spiroglyphua 127 



1. Bivonia 127 



5. Serpuloidea 127 



(5. Lementina 127 



7. Cladopoda 127 



I). Siliquariana, 



8. Siliquaria !_ - 



III. Leptopoda 



Fam. 1. Stronibidca 128 



a. SI rombina. 



1 . Strombus 1 _ 



2. Ptcrocera 



3. Fuaua l 



I). Serapkina. 



1. seraph} a 130 



Finn. 2. PkoridcB 130 



1. Phorua 



2. Onustus 131 



IV. Heteropoda 131 



Fam. 1. Pterotrackeida 131 



1 . Anops 131 



2. Pterotrachea 131 



3. Firoloida I ! 



4. Cerophora 132 



5. Canliapoda 132 



(I. Carinaria 132 



Fam. 2. Atlantida- 



1. Oxygyrua 133 



2. Atlanta 131 



3 Stein 131 



Order II. SCUTIBRANCHIATA 135 



Synopsis of Suborders 135 



I. Riphidoglossa 



Suborder I. Scutibranchia 136 



Fam. 1. Xcridnidfc l.'Wi 



1. Nerita 136 



2. Puperita 137 



3. Neritella ... 



1. Catillns 



Fam. 2. Rotcttad* 139 



1. Rotella 1 ,D 



2. Photina 1 | i 



1 [aanda l i l 



1. Camitia 



