54 PROCEEDINGS OF THE ACADEMY OP 



(referred to above under B. Vincentinus). The central tooth is 

 higher than wide, tricuspid, the central cusp short, not extending 

 near the base of the tooth. The laterals (5 in number) are bi- 

 cuspid, the inner cusp with short, subcircular cutting edge. 

 Marginals of the type of B. laticinctus (1. c). 



Bulimus {Paehyotus) egregius, Jay. 



Brazil. J. G. Anthony. 



No jaw received. 



Lingual membrane as usual in the Helicidse. Centrals and 

 laterals higher than wide, the plates almost extending to the point 

 of the cusps ; central with a large median and small side cusps ; 

 lateral bicuspid, the inner cusp very large, and bluntly pointed, 

 the outer cusp very small, and acutely pointed. Marginals quad- 

 rate, about as high as wide, with one wide, very short, blunt 

 inner cusp, and a similar small outer cusp. (PI. YI., fig. 1.) 



Succinea Barbadensis, Guild. 



Barbados. Jaw and lingual membrane as usual in the genus. 

 Lithotis rupicola, Blanford. 



Figs. 3-6 of plate V. represent the jaw and lingual dentition of 

 this species, which are fully described in Ann. Lye. Nat. Hist. N. 

 Y., X. 346. 



Erinna Newcombi, A. Adams. 



Sandwich Islands. 



Figs. 1-10 of plate Y. represent the jaw and lingual dentition of 

 this species, which have been fully described in Ann. of N. Y. Lye. 

 of Nat. Hist., X. p. 349. 



Before closing this paper, I propose reviewing my work on lin- 

 gual dentition and jaws, for the purpose of ascertaining what 

 reliance may be placed on their characters as a basis for subgeneric 

 distinction, in the genera Helix and Bulimus. Of Bulimulus we 

 cannot 3'et speak with confidence, so poor is our material. 



Sagda. — The genus is included in the Vitrinea of von Martens, 

 but we have shown that it belongs to the Helicea, the marginal 

 teeth being quadrate, not aculeate. 



The jaw has no anterior ribs. In H. Jayana there is an approach 

 to a median projection to the cutting edge, but not in Haldemani- 

 ana or Foremaniana. 



The lingual membrane we have examined in connectens^ Jayana^ 



