﻿PTEROPODA.— Pi.ATK IV. 



Genns BALANTIUM. Leach. 

 Testa triangularis, hyalina, compressa, longitudirialiter 



iindata, apertwra angnsta, transversa, ad angulos 



lion rimata. 

 Shell triaBgular, hyaline, compressed, longitudinally 



wared, aperture narrow, transverse, not slit at 



the angles. 

 This genus does not appear to dilfer very essen- 

 tially from Cleodora. The angles of the apertui-e are 

 not slit, and the outer lip is not produced. Several 

 species are enumerated by authors, but with the 

 exception of the one given below they are not known 

 to the present writer. 



itlriiique transverse undulativi liratd, facie dorxnli 

 longitudinaliter tri-liratd ; facie ventrali ad latera 

 concavd, medio late twmido ; marginibus laterali- 

 hrts acute carinaiis ; spina apicali acuta, recurvd : 

 aperiurd semilunari, ■marginibus undulatis. 



The eecueved Balantidm. Shell oblong-triangular, 

 transversely wavily ridged across ; dorsal surface 

 with three longitudinal ridges ; ventral surface 

 concave at the sides, broadly swelled in the 

 middle ; lateral margins sharply keeled ; apical 

 spine sharp, bent backwards ; aperture semi- 

 lunar, with undulating margins. 



Children. Mus. Brit. 



Cleodora Balantiurn. Rang. 



Hab. Australia. 



Species 2G. (Fig. a, l>, Mus. Brit.) 

 Bai.astium RECURVUM. Bal. textd ohloiiyo-triaiigular 



Vide notice and figures of several other species of 

 Balantiurn at Plate Vl. 



