Dr. Cantor on the Flora and Fauna of Chusan. 487 



reflexo planato, ad labii basin plica obliqua solida, sulcoque concur- 

 rente munito. Axis 1*1 poll. 

 Habitat. In the earth. 



*Clausilia aculus. Testa subulata, nitida,' epidermide fuscescenti, 

 anfractibus 10 aut 11, oblique leviter striatis ; apertura dentibus 

 duobus vel tribus munita, peristomate reflexo. Axis longior 0*65, 

 minor 0'5 poll. 



Habitat. In the earth, on mossy stones, walls and trees. 



*Achatina erecta. Testa albida, solidiuscula subulato-turrita, epi- 

 dermide foeda, scabra ; anfractibus octo, planulatis, suturis impressis ; 

 apice obtuso. 



Habitat. Same localities, and in company with Clausilia aculus. 

 Common at Macao, where however C. aculus is not found. 



Aquatica. 



*Planorbis papyraceus. Testa compressa, olivaceo-cornea, subpo- 

 lita, minutissime radiato- striata ; anfractu ultimo latiori, supra infra- 

 que sequaliter convexo ; peripheric carinata, spira, basique ambabus 

 depressis, umbilicatis, umbilico inferiori arctiori ; labro superiori 

 valde prominente, semicirculari, inferiori recedente, recto. Diam. 0*4 

 poll. 



Habitat. Canals, ponds, attached to Chara. 



*Planorbis hemisphcerula. Testa nitida, olivaceo-cornea, supra 

 convexa, apice planulata, infra excavata, umbilico coarctato, peri- 

 pheria obtusa, nullo modo carinata. Diam. 0'25 poll. 



Habitat. Same localities as P. papyraceus on Chara and Lemna. 



Planorbis compressus, Hutton. 



Habitat. Same localities as the preceding. Inhabits also Bengal. 



*Lymncea plicatula. Testa elongato-ovata, cornea, scabriuscula ; 

 anfractu ultimo transverse plicatula, suturis impressis ; spira medio- 

 cri, apice acuto plerumque ferrugineo; apertura infra patulante, basi 

 evasa. 



Habitat. Ponds. 



*Lymncea minor. Testa ovato-acuta, cornea, polita ; spira, vix di- 

 midium testae efformante, apice obtusiusculo ; anfractibus quatuor, su- 

 turis leviter impressis ; apertura ovata, plica columellas obsoleta. 



Habitat. Same locality as the latter. 



Tectibranchiata. 

 *Bull&a caurina. Testa ovato-oblonga, alba, tenuissima, papyracea, 

 transverse eleganter minutissimeque striatula ; apertura auriformi 

 supra angustata, infra patulante ; labro apicem superante ; spira 

 nulla. 



Habitat. Said to inhabit canals. 



Pectinibranchiata. 



*Paludina quadrata. Testa elongato-conoidea, crassa, epidermide 

 viridi-olivacea, anfractibus sex planulatis, leviter transverse plicatis, 

 longitudinaliter liratis ; liris subquinis ; apertura mediocri, intus al- 

 bida violacea ; umbilico arcto, peritremate nigrescente. 



Habitat. Canals and ponds. 



