Dentition of Pulmonate Mollusks. 107 



with one inner, oblique, large bifid cutting point, and two outer smaller 

 cutting points. A marginal is shown in the figure, with a central and 

 lateral. 



Coryda. 



Cory da Gossei, Pfr. Jamaica. Messrs. Vendreyes and Gloyne. 

 Jaw not examined. 

 Lingual membrane (PI. V, fig. J) broad ; of same type as in Plagioptycha. 



Plefoecula. 



Plebecida lurida. Madeira. Dr. Hillebrand. 



Jaw low, slightly arcuate, ends scarcely attenuated ; anterior surface with 

 about eight broad, separated ribs. 



Lingual membrane (PI. V, fig. K) with tricuspid centrals, bicuspid later- 

 als, all the cusps bearing cutting points ; marginals with one, inner, long, 

 oblique, bifid cutting point, and one outer, smaller, bifid cutting point. 



Lepiaxis. 



Leptaxis undata, Lowe. Madeira. Dr. Hillebrand. 



Jaw described by Morch as narrow, with numerous ribs converging to 

 the centre. 



Lingual membrane (PI. VIII, fig. C) of the individual examined, pecu- 

 liarly abnormal, the malformed teeth as figured being repeated frequently 

 on each transverse row, and down the whole length of the membrane. 

 Such malformations are often found in lingual membranes. 



Pomatia. 



See Terr. Moll., V, for description of jaw and membrane of 

 P. aspersa. 



Pomatia Sieboldtiana, Phil. Japan. 



Jaw high, arched, ends but little attenuated, blunt; anterior surface with 

 eight stout, separated ribs, denticulating either margin; no median projec- 

 tion to cutting edge. (PI. XVI, fig. H.) 



Lingual membrane (PI. VIII, fig. B) long and narrow; teeth 39-1-39, 

 with 21 perfect laterals on each side of the median line; base of attachment 

 of centrals long and narrow, reflection broad, with stout median cusp and 

 cutting point; side cusps and cutting points wanting; laterals like the cen- 

 trals, but asymmetrical, the fifteeenth lateral is the first with the side cutting- 

 point; marginals low, wide, with one broad, oblique, bluntly bifid cutting 

 point, and one side, short, cutting point. 



The species was put by von Martens in Acusta, a sub-genus 

 of Xanina. 



