206 THE CHICAGO ACADEMY OF SCIENi ES. 



Types: Cubensis, location not ascertained; lecontii, Smithsonian 

 Institution one specimen, No. 121503. Specimen figured by Tryon in 

 Con. Hakl. 



Type Locality: Cubensis, Cuba; lecontii, 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. 



Radula: (Plate VII, fig. F), Formula :£*Ll§+| + '.+ % +\+\i 

 (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 

 pear-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) : 



Penis. 



Penis-sac. 



Vas. def. 



Pros, 

 duct. 



Rec. sem. 



P 



enis ret. 



Pe 



nis-sac. 

 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 



