132 Chusan Shells. [No. 2. 



nopsis. There are seldom more than seven whorls present, the apex 

 being subject to decollation, which in this genus, I have observed to 

 be an indication of residence in stagnant water. 



" Nearly all adult specimens somewhat mutilated. Found in the 

 canals close to the sea in the mud, and makes its appearance in the 

 market, not as an article of food, but in company with the fish 

 caught by dragging the bottom of the canals." 



Melania (Hemisinus ? Swainson) crebricostis, Benson. 



Testa elongato-turrita, olivacea, tenui, anfractibus plurimis leviter 

 convexis ; costis frequentissimis albidis, lsevigatis munitis, ultimo 

 costulis evanidis ; balteo submediano, rugisque plurimis basalibus 

 circumdato ; suturis impressis ; columella subrecta ; basi leviter cana- 

 liculato-effusa ; labro tenui, laevi, sub-reflexo ; apice decollate Axis 

 testae decollate 1.05 poll. 



This is a very interesting shell, agreeing nearly with Swainson's 

 subgenus Hemisinus, the type of which is figured in Griffith's 

 Cuvier as Melania lineota (Vol. XII. PI. 18, fig. 4). The Chusan 

 shell however, shews no symptom of the crenation in the aperture, 

 which is attributed to the type. The species now described leads 

 to the sub-genus Cerithidea. 



" Pound among specimens of Melania cancellata." 



Batillaria,* Nov. Gen. 



Testa turrita, insculpta, rudi ; anfractibus plurimis, apertura ob- 

 longa, infra angustiore, basi truncata, evasa; labro sinuata, supra 

 emarginato, infra provecto ; labio supra callo munito ; columella 

 planata, basi incrassata, oblique truncata, canalem vix efFormante ; 

 operculo corneo, tenui, spirali, multiverticillato. 



Batillaria zokalis, Benson. 

 Testa elongato-turrita, scabra, albida, fasciis fuscis ornata ; anfrac- 

 tibus tredecim mediocriter convexis, costulis liris longitudinalibus 

 decussatis, supra sub-nodulosis ; apertura intus fasciis fuscis strigata ; 

 columella alba. Axis 1.4 poll. 



Syn. Cerithium zonale, Lam. L'ocean des Antilles. 



C. zonale, Gray, Griff Cuv. 12, Pi. 14, fig. 1, China? 



* Bati/la, a shovel ; frooi the lengthened form of the shell, and the conformation 

 of the base of the aperture. 



