112 



MOLLUSCA 



TABULAE VIEW OF THE SUBDIVISIONS OF THE CLASS GASTROPODA, ARRANGED so AS TO SHOW THEIR SUPPOSED GENETIC 



RELATIONSHIPS. 



Class. GASTROPODA. 

 (Archisoplcurum. ) 



Sub-class 1. Iso PLEURA, 



Sub-class 2. ANISOPLEURA. 

 (Archieuihyneivrum.) 



Branch a. STREPTONEURA. 

 (Archizyyobranchium. ) 



O 



Order 1. ZYGOBRANCHIA. 



y 



o* 



Order 2. AZYGOBRANCHIA. 

 (Archiholochlamydum.) 



Sect. a. 

 licptantia. 



Sect. 6. 

 Natantia. 







co to 



S > S* 

 i 1- I 



\ \ 







Branch b. EUTHYNEURA. 

 (ArchiopisthobrancJiium. ) 



Order 1. OPISTIIOBRANCHIA. 

 (Archipalliatum. ) 



Order 2. PULMONATA. 

 (Archibasommatum.) 



Sect. a. 

 Palliata. 



co 



r 

 I 



Sect. J. 

 Non-Palliata. 



! 



8- 





Family 11. Naticidte. 



Genera : Nalica, Lam. ; Sigarctus, Lam. ; Ncritopsis, Gratel. 

 Family 12. Entoconchidie. 



The single genus and species EntoconcJia mirabilis, discovered by 

 Joh. Muller in 1851, parasitic in Syna.pla digitata. The adult 

 form is not known. 

 Family 13. Marsenidse. 



Genera : Marsenia, Leach ; Onchidiopsis, Beck. 

 Family 1 4. Acmieidie. 

 Genera : Acmtea, Eschsch. ; Lottia, Gr. ; (probably these will be 



found to belong to the Zygobranchia). 

 Family 15. Capulidse. 

 Genera : Capulus, Montf. ; Calyptreea, Lam. (fig. 40) ; Trochita, 



Sebum. 

 Family 16. Littorinidss. 



Genera : Littorina (the Periwinkles, fig. 46) ; Modulus, Gray ; 

 Lacuna, Turt. ; Rissoa, Frem. ; Hydrobia, Hartm. ; Assiminia, 

 Leaeh. 



Faniily 17. Paludinidas. 

 Genera: Paludina (River-Snail) (figs. 7, 21); Bithyuia, Gray; 



Tanalia, Gray. 

 Family 18. I'alvatidie. 



Genus : Vahvta (fig. 45), fresh-water. 

 Family 19. AmpullarUUe. 



Genus : Ampitllaria (can breathe air by means of the walls of 

 the pallial chamber as well as water by the gill ; fresh-waters 

 of tropical America, Africa, and East Indies). 



Sub-order 2. Pncumonochlamyda. 



Characters. Pallial chamber a lung-sac ; no gill ; mouth on a 

 rostrum, not a retractile proboscis; terrestrial habit. 



Family 20. Ctjclostomidie. 



Genera : Ci/clostoma, Lam. ; Cyclnphortis, Montf. ; Fcnissina, 



Gratol. ; Pujrina, Vignard. 

 Family 21. Hclicinidie (radula rhipidoglossate rather than tanio- 



glossate). 

 Genera : Sloastoma, Adams ; Trochatdla, Swains. ; LTcltciiia, 



Lam. ; Proscrpiiia, Guild. 

 Family 22. AdculUlee. 

 Genera : Acicula, Hartm. ; Gcomclania, Pfr. 



Sub-order 3. Siphonochlamyda. 



Characters. Reptant Azygobranchia with the margin of the 

 mantle drawn out to form a trough-like siphon which notches the 

 lip of the shell ; shell always spiral ; usually an operculum, horny 

 or lamelliform ; either a rostrum or a retractile proboscis ; exclusively 

 marine ; mostly carnivorous. 



* Tsenioglossa (3.1.3). 

 Family 1. Slrmnbidie. 



Genera : Strombus, L. ; Ptcroccras, Lam. ; Rostcllaria., Lam. 



(fig. 43). 

 Family 2. Aporrhaidm. 



Genus : Aporrhais, Da Costa. 

 Faniily 3. Pedicularidss. 



Genus : Pcdicularia, Swains. 

 Family 4. DoUdse. 



Genera: Cassis, Lam.; Cassidaria, Lam.; Doliuin, Lam.; Ficiilrt, 



Swains. 

 Family 5. Triton ill IF. 



Genera : Tritonium, Cuv. (fig. 42) ; JSanclla., Lam. 

 Family 6. Ct/pra'idtv (the Cowries). 



Genera : Cypriea, L. ; Ovulum, Brug. (fig. 41) ; Erato, Risso. 



* Toxiglosm (1.0.1). 

 Family 7. Conidas. 

 Genus : Comts, L. 

 Family S. Tcrcbridas. 



Genus : Tercbra, Adans. 

 Family 9. Fleurotomida. 



Genus : Pleurotoma, Lam. 

 Family 10. Canccllaridai. 

 Genus : Cancellaria, Lam. 



* Bachiijlossa (1.1.1 or .1.). 

 Family 11. Muricidss. 

 Genera : Murcx, L. ; TrojiJton, Montf. ; Fusus, Rrug. ; Pyrula, 



Lam. (lig. 38); Turbiiidlu, Lam. 

 Family 12. BuctinitJt?. 



Genera : Buccinum, L. ; Nassa, Lam. (fig. 5) ; Purpura, Pirug. 



(fig. 47); Concholepas, Lam.; Maijiltis, Montt. 

 Faniily 13. AlUridas. 

 Genus : Mitra, Lam. 



