488 Dr. Cantor on the Flora and Fauna of Chusan. 



*Paludina leq/thoides. Testa ovato-acuta, olivacea, anfractibus 

 sex aut septem rotundatis, transverse subplicatis ; suturis excavatis ; 

 apertura oblonga, peritremate subreflexo, nigro ; apice acuto ; umbi- 

 lico aetate evanescente. 



Habitat. Ditches and ponds. 



^Paludina (Bitht/nia, Gray) longicornis. Testa ovato-conoidea, 

 cornea, polita, spira aperturam longitudine vix superante ; anfrac- 

 tibus quatuor, ultimo convexo, suturis minime depressis ; apertura 

 subrotunda, supra angulata ; peristomate subreflexo, nigrescente ; 

 labio crassissimo ; operculo testaceo, umbilico evanido ; apice ob- 

 tuso. 



Habitat. In canals, attached to aquatic plants, stones, piles. 



*Paludina (Bithynia) striatula. Testa ovato-acuta, cornea, polita ; 

 spira elongata ; anfractibus quinque convexiusculis, liris pluribus, in- 

 terdum inconspicuis, circumdatis ; suturis depressiusculis ; apice ob- 

 tusato ; peristomate reflexo nigrescenti, undato ; umbilico evanido ; 

 operculo calcareo. 



Habitat. Same localities as the latter. 



Laguncula, nov. gen. Testa turbinata, subglobosa, apertura majori, 

 Integra, oblonga ; peristomate interrupto ; labio subreflexo ; umbilico 

 profundo tortuoso. 



* Laguncula pulchella. Testa albido-glauca, ovato-globosa ; anfrac- 

 tibus convexis, lineis longitudinaiibus elevatiusculis aliisque obliquis 

 decussatis instructis ; suturis impressis ; apertura intus fascia lata 

 pallida castanea ornata columellaque intus concolore. 



Habitat. Said to inhabit canals. 



*Melania cancellata. Testa elongato-turrita, olivacea, solidiuscula, 

 anfractibus novem convexiusculis, omnibus costulis frequentibus, ul- 

 timoque fasciis tribus elevatis basalibus munitis ; costulis liris pluri- 

 mis cancellatis ; suturis mediocriter excavatis ; apice eroso. Axis 

 rO poll. V. paulo plus. 



Habitat. Canals. 



*Melania (Hemisinus ? Swainson) crebricostis. Test^ elongato- 

 turrita, olivacea, tenui, anfractibus plurimis leviter convexis ; costis 

 frequentissimis albidis, Isevigatis, munitis, ultimo costulis evanidis, 

 balteo submediano, rugisque plurimis basalibus circumdato ; suturis 

 impressis ; columella subrecta ; basi leviter canaliculato-eff^us^ ; labro 

 tenui, laevi, subreflexo, apice decoUato. Axis testae decollatse 1*05 poll. 



Habitat. Found with the preceding, but scarce. 



Batillaria-f, nov. gen. Testa turrita, insculpta, rudi ; anfractibus 

 plurimis ; apertura oblonga, infra angustiore, basi truncata, evasa ; 

 labro sinuato, supra emarginato, infra provecto, labio supra callo 

 munito ; columella planata, basi incrassata, oblique truncata, cana- 

 lem vix efFormante ; operculo corneo, tenui, spirali, multiverticillato. 



Baiillaria zonalis (syn. Cerithium zonale, Lamarck, L'Ocean des An- 

 tilles ; C. zonale. Gray, China, GriiF. Cuv. xii. pi. 14.). Testa elon- 

 gato-turrita, scabra, albid^, fasciis fuscis ornata ; anfractibus tredecim, 



f Batilla, a shovel, from the lengthened form of the shell, and the con- 

 formation of the base of the aperture. 



