194. THE CHICAGO ACADEMY OF SCIENCES. 
Jaw: About twice as wide as high, with squarish ends and a 
heavy convex median swelling. The jaw resembles that of Galba 
palustris (see pl. VI, fig I). 
Rapvuta: (Plate VIII, fig. E) Formula:  917s+3+$444+343+0%5 
(21-1-21). Central tooth with a sharp, spade-shaped cusp, the opaque 
portion of the reflection strongly trilobate; lateral teeth eight in num- 
ber, bicuspid, the mesocone very broad and modified on the inner side 
by a strong swelling which probably corresponds in position to an en- 
tocone ; ectocone small, broad, placed rather high up on the reflection ; 
the seventh and eighth teeth are narrower than those preceding; the 
ninth tooth is intermediate and is strongly tricuspid, the entocone being 
very sharp, wide, and placed rather high upon the inner side of the 
tooth; marginal teeth beginning abruptly with the tenth tooth and six to 
eight cuspid, acquired by splitting of the ectocone being high up on 
the outer margin of the tooth; the mesocone persists throughout the 
marginal teeth as a rather large cusp, while the entocone splits up into 
several small denticles. The first lateral on one side in one membrane 
had a double cuspid ectocone. There are about 80 rows of teeth. 
The radula of haldemani differs widely from that of any other 
known species of this family and is approached only by Lymnea ha- 
waiensis Pilsbry, as mentioned on a previous page. 
GENITALIA: (pl. XI, fig. F) Male organs; penis-sac cylindrical, 
2.25 to 2.60 mill. long and about .90 mill. wide; penis short, thick, 1.50 
to 2.00 mill. long (4/6 to 4/7 the length of penis-sac) ; vas deferens 
6.00 to 6.50 mill. in length; prostate duct 2.80 to 2.90 mull. long, en- 
tering the prostate by a slight enlargement; prostate flatly cylindrical, 
1.60 by .60 mill., its ends broadly rounded, the posterior portion very 
narrow; penis and penis-sac retractors equal in length (each 1.65 in 
alcoholic specimen and 3.00 in fresh specimen), attached distally to 
the columellar muscle; protractors of penis-sac three to four in num- 
ber, two posterior and one small or two large anterior; each muscle is 
very slender and enters the penis-sac by several terminations. 
Female organs; receptaculum seminis large, rounded, with a duct 
three mill. long, which enters the oviduct by an enlargement; first ac- 
cessory albuminiparous gland large, ovate; second accessory albumini- 
parous gland very small; free portion of oviduct large, short; the other 
organs not differing from those of the other Lymnezide. 
The penis-sac retractor muscles exhibit some variation in their 
insertion in the penis-sac (pl. XV, fig. E). In two examples (pl. XI, 
I’; pl. XV, E, 2) the muscle is split to form four rather widely sepa- 
