LYMNZIDZ OF NORTH AMERICA. 423 
GENITALIA: (PI. XII, fig. H). Male Organs: Penis-sac long and 
cylindrical, 3.50 to 5.00 mill. in length; penis short and thick, 2.00 to 
3.00 mill. in length, or about one-half the length of the penis-sac; vas 
deferens 24.00 to 26.00 mill. in length, or about five times the length 
of the penis-sac; prostate portion of vas deferens 6 mill. long ; prostate 
very large and somewhat quadrate, narrowing posteriorly to form a 
rounded tube as large in diameter as the oviduct; a side view of the 
prostate shows it to be very elongate-ovate; protractor muscles six 
to seven in number, four narrow, slender posterior muscles with 
numerous small branches entering the penis-sac and two to three large 
anterior muscles, with many branches entering the penis-sac. Penis 
retractor 3.00 mill. long, narrow; penis-sac retractor wide, ribbon-like, 
swollen in the middle and entering the penis-sac by many small 
branches. The retractors have a common insertion in the columellar 
muscle. 
Female Organs: Similar to those of emarginata,; the first acces- 
sory albuminiparous gland is somewhat pear shaped, elongated and 
very large; the second accessory albuminiparous gland is very small 
and rounded and placed rather high up on the oviduct; receptaculum 
seminis large, rounded, its duct 5.00 to 6.00 mill. in length and at- 
tached to the oviduct one mill. from the vaginal opening, by a bulbous 
termination. 
The organs are colored as follows: Penis and penis-sac yellowish, 
prostate yellowish or amber-colored; ovotestis yellowish, albuminipar- 
ous gland greenish, receptaculum seminis pearly white, and the other 
organs yellowish. 
The genitalia measure as follows: (Dissection No. 23667). 
Ret. Vas. 
Penis- mus. Ret.mus. Vas. def. Rec. 
Penis. sac. penis. penis-sac. def. prot. sem. Shell. 
3.00 5.00 3.25 2.25 24.00 600 . 4.20 19.00 Michigan. 
2.75 3.50 3.00 2.00 24.00 600 6.00 20.00 
3.00 425 3.00 225 25.00 600 5.00 23.50 a 
There is some variation in the lengths of the penis and penis-sac 
but otherwise the measurements are quite uniform. The form and 
position of the protactor and retractor muscles of the male organs are 
also very uniform. 
The genitalia of angulata differ from those of emarginata prin- 
cipally in the form of the first accessory albuminiparous gland which is 
longer and more spindle shaped. 
RANGE: (Figure 47). Michigan to Minnesota, Northern Michi- 
gan south to Southern Wisconsin. A race of the Transition (Caro- 
2 
