12$ Dentition of Pulmonale Mollusks. 



Jaw with the accessory plate as usual in the genus. 



Lingual membrane (PI. XI, fig. M), centrals tricuspid ; laterals larger, but 

 also tricuspid ; marginals irregularly pectinate. 

 Specimens from Trinidad have the same dentition. 



Succinea. 



For jaw and dentition, see Terr. Moll., V. 



Succinea pallida, Pfr. Raiatea Island. Mr. A. ijarivi t. 



Jaw as usual ; no anterior ribs. 



Lingual membrane V P1. X, fig. K) with about 30-1-30 teeth ; eleven later- 

 als on either side. 



Succinea papillata, Pfr. 

 Jaw as in last. 



Lingual membrane (PI. X, fig. L) with 25-1-25 teeth, nine laterals on each 

 side ; some of the outer laterals have their outer cutting point bifid. 



Succinea sagra, D'Orb. Jamaica 

 Jaw as usual ; a median projection to cutting edge. 

 Lingual membrane as usual in the genus. 



Succinea canella, Gld. West Maui, Sandwich Islands. 

 Jaw and lingual membrane as usual. 



Succinea Barbadensis, Guild. Barbadues. 

 As in last species. 



GONIOGNATHA. 



Jaw in separate pieces: the upper median one usually tri- 

 angular. 



Orthalicus. 



For jaw and lingual membrane, see Terr. Moll., V. 



Orthalicus obductus, Shuttl. Islands in the Bay of Panama. 

 Mr. McNiel. 



Jaw as usual in the genus. 



Lingual membrane (PI. XII, fig. B) as usual in the genus, with lateral 

 teeth; teeth about 96-1-96. The base of attachment in centrals and first 

 marginals is extended beyond the reflection. 



Orthalicus gallina- sail f ana, Chemn. Maranon, Peru. Prof. 

 Or ton. 



