185 Jaw and Lingual Dentition of Pulmonata. 
Coecilianella Gundlachi, Pfr. 
St. Martin. Dr. H. E. Rygersma to Mr. T. Bland. 
Mr. Bland has already noticed this species in Ann. Lyc. Nat. Hist. of 
N. Y., XI, 152, 1875, where a detailed description of the jaw and lingual 
membrane will be found. 
I add a figure of the jaw (pl. xiii, fig. D), with a still more enlarged 
view of a portion of it (fig. G), to show the character of the ribs. As 
stated in the article referred to, these ribs are quite different from those 
described by Sordelli for C. acicula. 
Pl. xiii, fig. H gives a camera lucida drawing of a central, lateral and 
marginal tooth. Fig. 1 gives a still more magnified view of the transition 
and marginal teeth, not drawn, however, by camera lucida. 
Jaw low, wide, slightly arcuate, ends attenuated; whole surface cov- 
ered with about 22 crowded, broad, flat ribs, denticulating either margin. 
Lingual membrane long and narrow. Teeth 18-1-18, with 4 perfect 
laterals. Centrals with their base of attachment long, narrow, their re- 
flected portion about one-half the length of the base of attachment, tri- 
cuspid; the middle cusp stout, with a short blunt cutting point, side cusps 
subobsolete, but with small, distinct cutting points. Lateral teeth with 
their base of attachment subquadrate, much longer, and very much 
broader than that of the centrals, the reflected portion short, stout, tri- 
cuspid, the middle cusp very stout and long, reaching the lower edge of 
the base of attachment, beyond which projects the short, stout cutting 
point; side cusps subobsolete, but bearing distinct, though small cutting 
points. There are four perfect laterals, the fifth tooth being a transition 
to the marginals, by the base of attachment being lower, wider, not ex- 
ceeding the reflected portion, with one inner large cusp bearing one outer 
large cutting point representing the outer cutting point of the first four 
lateral teeth and one inner, still larger, cutting point, representing the 
middle cutting point of the first four laterals, and one smaller, outer cusp, 
bearing one small, sharp, bifid cutting point, representing the outer side 
cutting point of the first four laterals. The sixth tooth has the largest 
cutting point bifid. The balance of the teeth are true marginals. They 
are very low, wide, with: two low, wide cusps, bearing. each several irreg- 
ular, blunt cutting points. 
The dentition of this species is, as would be anticipated, of the same 
type as the allied Cecilianella acicuta as figured by Lehmann (Lebenden 
Schnecken Stettins, p. 128, pl. xiii, fig. 48, and Sordelli, 1. c., fig. 26). 
The jaw, however, has no appearance of the ‘‘ brace” like ribs described 
in that species by Sordelli (Atti Soc. Ital. Sc. Nat., XIII, 1870, 49, pl. i, 
fig. 25). The ribs are quite like those figured of Helix Lansingi (Ann. 
Lyc. Nat. Hist. N. Y¥., XI, p. 75, fig 2 A) although they are narrower. 
