Dr. Cantor oti the Flora and Fauna of Chusan. 3 1 



5. MOLLUSCA. 

 {Described by W. H. Benson, Esq., Bengal Civil Service.) 

 Gasteropoda. 

 Pulmonifera. Terrestria. 



Incilaria f, nov. gen. Corpus elongatum, postic^ attenuatum, 

 repens, undique velo marginatum. Tentacula quatuor, superioribus 

 oculiferis, inferioribus integris. Foramen commune in latere dextro, 

 non procul ab extremitate antica veli situm. 



"^Incilaria bilineata. Corpore livido, velo punctis maculisque fuscis 

 conspersis ornato, lineis duabus lateralibus, nigrescentibus, unica ob- 

 scuriore mediana strigata. Long, ad poll. 1-|. 



Habitat, The earth, under roots, on trees and plants. 



*'Helix ravida. Testa subglobosa, umbilicata, epidermide olivacea, 

 anfractibus sex transverse subplicatis, ultimo ventricoso, suturis im- 

 pressis, umbilico mediocri ; apertura suborbiculari elongatiuscula, 

 labio reflexo, tenui explanato, labro acuto. Axis 1'3, diam. 1'33. 



Habitat. Trees, stones, rocks, earth. 



"^ Helix tapeina, Journ. Asiatic Society, vol. v. p. 352. No. 7. 



Habitat. N.E. frontier of Bengal. Rare at Chusan. 



*Helix naninoides. Testa solidiuscula, subdiscoidea, superne ra- 

 diatim tenuiter striata, infra striis Isevigatis, distantibus ; spira de- 

 presso-conoidea, apice obtusato, planulato ; apertura transverse lunata, 

 labro obtuso, crasso, infra subreflexo. 



Habitat. Singapore ; scarce at Chusan. 



* Clausilia pluviatilis . Testa fusiformi pallide olivacea; spira atte- 

 nuata, crystallina, apice papillari ; anfractibus 14, medianis ventri- 

 cosioribus, omnibus leviter transverse striatis ; peristomate valde 

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

 rente munito. Axis Tl poll. 



Habitat. In the earth. 



*Clausilia aculus. Testa subulata nitida, epidermide fuscescenti, 

 anfractibus 1 aut 1 1 , 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, vi^alls 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, w^here hovt^ever 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 ; peripheriii carinata, spiril basique ambabus 



depressis, umbilicatis, umbilico inferiori arctiori ; labro superiori 



t From incile, a gutter, with reference to the gutter-like channel which 

 divides the mantle from the foot. 



