174 PROCEEDINGS OF THE ACADEMY OF 
The Limax Ingersolli was received since this paper was com- 
menced. It has not yet been described. 
Being thus confident of the identity of the species before me, I 
will proceed to describe their jaws and dentition in detail. 
I have examined the jaw of all the species, finding it to agree 
with the well-known character of the jaw in the genus. It is 
arcuate with slightly attenuated, but blunt ends; 
anterior surface smooth, cutting margin with a 
decided beak-like median projection. There is 
often a central vertical carina to the jaw. The 
ends are often more pointed than in the jaw 
figured. 
Limax maximus, Linn. (pl. IV., fig. 4) has about 76—1—176 
teeth. The centrals have a large, subquadrate base of attachment. 
The reflection is large, subquadrate, and bears a single stout 
median cusp, which has a short cutting point, often longer than 
in the teeth figured; the side cusps are subobsolete, and bear no 
cutting points. The lateral teeth, about 18 in number, are like 
the centrals, but unsymmetrical. The marginal teeth are aculeate. 
Only a few are simple, as in fig. b, the balance are bifid, as in fig. 
c. The bifurcation of the marginals commences much nearer the 
median line than in the specimens examined by Lehmann and 
Heynemann. ‘There are, indeed, but twelve marginals without the 
bifurcation on one membrane examined. 
Inmax flavus,’ Linn. (pl. IV., fig. 1). The specimen examined 
has about 60—1—60 teeth, with 16 laterals. The centrals and 
laterals are of the same type as in JZ. maximus, the outer mar- 
ginals are also bifid. PI. IV., fig. 1, represents the dentition of the 
species. On other portions of the same membrane the cutting 
points are longer and sharper. Fig. e represents an extreme 
marginal. Both of the figures of this species, published by me,? 
were drawn from lingual membranes of another species. 
fimax agrestis, Linn. (pl. LV., fig. 3, a. 6. ¢.) has about 50—1— 
Jaw of Limaz. 
1 L. and Frw. Sh. N. A., I. p. 68, fig. 105, is no doubt ZL. agrestis. Fig. 
6, p. 285, of Ann. Lyc. N. H., N. Y., vol. IX., would more correctly repre- 
sent the dentition of this species, if the extreme marginals were bifid. 
2 The description and figure given by Morse (Journ. Portland Soc. N. H. 
1864, 7, fig. 1) of the jaw of this species could not have been drawn from 
any Limaz, as it is said to be ribbed. The figure of the lingual membrane, 
also (pl. III., fig. 2), does not give the impression of aculeate marginals. 
’ The figure given of the marginals of L. agrestis, by Lindstrom (Gotlands 
