LYMNZIDZ OF NORTH AMERICA. 203 
Clessin (op. cit.) discusses the group of Lymnea truncatula, plac- 
ing humilis, desidiosa (=obrussa) curta, cubensis, galbana, etc., in it. 
He also places solida, pallida and traski in the same group, clearly 
showing that he did not understand these species. 
The Liver-fluke (Fasciola hepatica) has been found parasitic on 
Lymnea truncatula (Journ. Conch., III, p. 329, 1882). 
Galba doddsi Sp. Nov. Plate XXVII, figures 5-8. 
Limnea truncatula CocKERELL, Journ. Conch., VI, p. 63, 1889; Nautilus, 
III, p. 9, 1889 (part). 
Limnea humilis Henverson, Univ. Col. Studies, IV, p. 179, 1907 (part). 
SyeLL: Elongated, turreted; color brownish horn; surface with 
very heavy growth lines, giving the shell a rough aspect; whorls 5%, 
plano-convex, the body whorl slightly ventricose ; spire turreted, a trifle 
longer than the aperture ; sutures impressed; aperture ovate or roundly 
ovate; inner lip reflexed to form a projecting shelf, which is not 
tightly appressed to the parietal wall, but is erect and emargines the 
umbilical chink, which is large and conspicuous. 
Length. Breadth. Aperture length. Breadth. 
9.00 4.50 4.25 2.50 mill. Type. 
8.00 4.00 Bo OOD eae os 
6.50 sli) 3.00 BO a 
6.50 3.50 3.00 Qo) S 
Types: The Chicago Academy of Sciences, four specimens, No. 
23937. 
Type Locatity: Hot Sulphur Springs, Colorado. 
Jaw: Not differing materially from that of cubensis. 
Raputa: (PI. VI, fig. N). Formula: Ayes $+ tt et etitsls 
(25-1-25) ; central tooth with long, spade-shaped cusp; lateral teeth 
bicuspid, the mesocone very large, pointed, the ectocone smaller, promi- 
nent, placed rather high up on the reflection; there are two sets of 
intermediate teeth; the fifth and sixth tecth are tricuspid, the entocone 
arising on the lower part of the mesocone and being rather small; 
the seventh and eighth teeth have the mesocone almost subequal, the 
ectocone splitting into two teeth which become smaller; the marginal 
teeth begin on the ninth tooth, the entocone splitting into two or three 
small cusps. There are over seventy rows of teeth. The radula of 
doddsi is very uniform, exhibiting little or no variation among the 
individual teeth. In one ribbon 26-1-26 were counted. 
GENITALIA: Resembling closely those of Galba cubensis. 
Male organs: The penis-sac is twice the length of the penis, which 
is short and rather thick; the vas deferens is six times the length of 
the penis; the prostate is large, oblong-ovate, contracted at the proxi- 
