100 Dentition of Pulmonate Mollusks. 
The figuresof the jaw and lingual dentition of this species were photo- 
graphed from the microscope by my friend, Mr. Samuel Powel, of Newport, 
to whom I am greatly indebted for assistance in my studies of lingual den- 
tition. 
Stenogyra. 
See Terr. Moll., V, for dentition of S. suwbula, Pfr., and 
decollata, Lin. 
Stenogyra gonostoma, Gundl. Cuba. PD. Rafael Arango. 
Lingual membrane as in next species. 
Stenogyra octona, Chemn. Bahia. J. G. Anthony. 
Lingual membrane short and broad. 
Teeth about 30-1-80. Centrals with base of attachment long, narrow, an- 
gularly expanded at centre; reflection small, bluntly tricuspid, the central 
cusp bearing a short, stout, cutting point; laterals much larger, as wide as 
long; reflection very large, with an inner median large, and a small outer 
cusp on each side of it, all the cusps bearing distinct cutting points; mar- 
ginal teeth low, wide, irregularly denticulated by minute cutting points. 
The peculiarity of the dentition, as in the other species of Stenogyra, is the 
small central as well as distinctly tricuspid laterals; the latter are not 
crowded on the membrane. 
Stenogyra hasta, Pfr. Cuba. 
Jaw (Pl. XV, fig. I) low, arcuate, ends somewhat attenuated, blunt; no 
median projection to cutting margin; anterior surface with numerous, ver-. 
tical, delicate, striz. 
Lingual membrane (PI. VII, fig. D). Teeth 18-1-18, as usual in the genus. 
(See Terr. Moll., V.) 
Stenogyra guncea, Gld. Island of Huahine. Mr. A. Garrett. 
Described by Gould and Pfeiffer as a Bulimus. 
Lingual membrane with 28-1-28 teeth, eight of which on each side are 
laterals; dentition as in S. hasta. 
Strophia. 
See Terr. Moll., V, for jaw and lingual dentition of S. incana. 
Strophia decumana, Fer. Castle Island, Bahamas. 
Jaw stout, strongly arcuate, ends slightly attenuated, bluntly rounded; 
anterior surface ribless, transversely striate, and with several stout lines of 
reinforcement; a small, blunt, median projection to the cutting edge. 
Lingual membrane (Pl. VII, fig. A) with 801-80 teeth ; centrals short, 
about as broad as long, with short, stout median cusps to the reflection, 
bearing a stout, broad cutting point, and subobsolete side cusps bearing 
eee 
