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



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

 rente munito. Axis Tl poll. 



Habitat. In the earth. 



*ClausUia 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 erecia. 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. 



Aqtjatica. 



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

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

 que sequahter convexo ; peripheriii carinata, spira basique ambabus 

 depressis, umbilicatis, umbilico inferiori arctiori ; labro suj^eriori 

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

 poU. 



Habitat. Canals, ponds, attached to Chara. 



*Planorbis hemispharula. 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 ; sj)ira medio- 

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

 evasa. 



Habitat. Ponds. 



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

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

 turis leviter impressis ; apertura ovata, plica columellse obsoleta. 



Habitat. Same locality' as the latter. 



Tectibranchiata. 



*Bullcca caurina. Testa ovato-oblonga, alba, tenuissima, papyracea, 

 transversa eleganter minutissimeque striatula ; apertura auriformi 

 supra angustata, infra patulante ; labro apicem supcrante ; spira 

 nulla. 



Habitat. Said to inhabit canals. 



Pectinibranchiata. 



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

 viridi-olivacea, anfractibus sex planulatis, leviter transverse j)licatis, 

 longitudiualiter liratis ; liris subquinis ; apertura mediocri, intCis al- 

 bida violacea ; umbilico arcto, peritremate nigrescente. 



Habitat. Canals and ponds. 



