206 THE CHICAGO ACADEMY OF SCIENCES. 
Types: Cubensis, location not ascertained ; lecontii, Smithsonian 
institution one specimen, No. 121503. Specimen figured by Tryon in 
Con. Hald. 
Tyre Locaritry: Cubensis, Cuba; lecontu, Georgia. 
ANIMAL: Not examined. 
Jaw: (PI. VI, fig. G) Wide and low, with acutely rounded ends 
and a narrow median swelling on the ventral border. 
RapuLaA: (Plate VII, fig. F), Formula :444-#4+$+444$4+314¢ 
(22-1-22) ; central tooth with a long, acute cusp; lateral teeth bicus- 
pid, the mesocone very large, the ectocone much smaller; the 
first marginals (intermediate teeth) become tricuspid (seventh 
tooth) by the appearance of a rather large entocone about midway of 
the inner border of the mesocone; the eighth tooth has the entocone 
placed nearer the distal end of the mesocone, while in the ninth tooth 
it is placed higher up, but is much larger; at the tenth tooth the true 
marginals begin, the cusps becoming simple serrations. About ninety 
rows of teeth were counted. In one membrane the first tricuspid inter- 
mediate appeared at the seventh tooth on the left side and at the eighth 
tooth on the right side. The radula is similar to that of doddsi, the 
principal difference being that the intermediate teeth begin at the 
seventh instead of the fifth tooth. 
GENITALIA: (PI. XI, fig. A) Male organs: Penis-sac from 1.00 
to 1.50 mill. long; penis slender, 0.75 to 1.00 mill. long, or about 2/3 
to 3/4 the length of the penis-sac; vas deferens 2.50 to 3.00 mill. long; 
vas deferens to prostate 1.00 mill. long; prostate long-ovate, flattened, 
rounded at the extremities, narrowed at the proximal end where it 
joins the prostate duct; retractor of penis 0.75 mill. long and penis- 
sac retractor about the same length, the insertion being close together 
in the columella muscle; protractor muscles eight in number, three 
posterior and five anterior; the retractor muscles are large and pow- 
erful. 
Female organs: Receptaculum seminis elongate pear-shaped, the 
duct 2 mill. in length; first accessory albuminiparous gland somewhat 
pcar-shaped ; the receptaculum seminis is a delicate salmon color. 
The genital organs of cubensis are quite uniform. They resemble 
those of modicella more than any other species. Four specimens gave 
the following measurements (dissection Nos. 23320, 23321) : 
Pros. Penis-sac. 
Penis. Penis-sac. Vas.def. duct. Rec.sem. Penis ret. ret. Shell. 
0.75 1.00 2.50 1.00 2.00 0.75 0.75 7.50 
0.75 1.00 2.50 1.00 2.00 0.75 0.75 6.50 
1.00 1.50 2.50 1.00 2.00 0.75 0.75 7.00 
1.00 1.50 3.00 1.00 2.00 0.75 0.75 7.50 
