Dentition of Pulmonate Mollusks. 113 
Werope. 
Merope fringilla, Pir. Admiralty Island. Prof. A. G. 
Wetherby. 
The dried remains of the animal in the shell of a cabinet specimen fur- 
nished the lingual membrane and jaw here described. The shell is the 
variety with the pink peristome. 
Jaw with numerous crowded, stout ribs, denticulating either margin. 
Lingual membrane (Pl. X, fig. E) long and narrow; teeth 28-1-28, with 
about 11 laterals. Centrals with base of attachment longer than wide; side 
cusps obsolete, side cutting points wanting; middle cusp broad, blunt, with 
a very short, broad, blunt cutting point. Laterals like the centrals, but 
asymmetrical; the cutting point becomes longer as they pass off laterally, 
and at the 12th tooth it commences to be bluntly trifid. The marginals are 
peculiar; their base of attachment is subquadrate, with a single broad cusp, 
bearing a very broad, oblique, expanding, trifid cutting point; the outer 
division very small, pointed; the median longer, very broad, squarely trunc- 
ated; the inner one about half the size of the median, recurved and sharply 
pointed. 
The left hand figure in the plate shows a marginal in profile. 
The dentition of this species is peculiar, resembling that common in 
Orthalicus rather than the type usual in Helix. 
Helia, ————. ‘Costa Rica. Dr. Ws M. Gabb. 
Jaw not observed. 
Lingual membrane (Pl. V, fig. L) long and narrow. Teeth 15-1-15. Cen- 
trals with a base of attachment longer than wide, with lower lateral ex- 
pansions; reflection large, decidedly tricuspid, each cusp surmounted by a 
cutting point. Laterals like the centrals, but asymmetrical and consequently 
bicuspid. Marginals low, wide, irregularly denticulated or serrate, the 
inner three cutting points being longer than the outer ones, of which there 
are several. 
Helix astur, Souv. Ido not know the position of this species. 
New Caledonia. 
Jaw (Pl. XVI, fig. B) low, wide, slightly arcuate, ends scarcely attenu- 
ated, blunt; anterior surface without ribs; a wide, blunt, median projection 
to the cutting edge; a line of reinforcement running parallel to the cutting 
margin; a strong muscular attachment to the upper margin. 
Lingual membrane (Pl. X, fig. F) with 30-1-30 teeth, nine perfect laterals 
on each side; teeth as usual in the Helicide ; with decided side cusps and 
cutting points. 
Helix convicta, Cox. Australia. Dr. Cox. 
Subgeneric position unknown to me. 
Jaw highly arcuate, thick, ends blunt; anterior surface with seven sepa- 
rated, stout ribs, denticulating eijher margin. 
