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. 
Coryda Gossei, Pfr. Jamaica. Messrs. Vendreyes and Gloyne. 
Jaw not examined. 
Lingual membrane (PI. V, fig. J) broad; of same type as in Plagioptycha, 
Piebecula. 
Plebecula 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 Moérch 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 
Weel. 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 (Pl. 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 Nanina. 
