238 THE CHICAGO ACADEMY OF SCIENCES. 
tinctly tricuspid, the cusps being subequal (fig. B). In specimens from 
New Jersey the marginals began at the ninth tooth, the seventh and 
eighth teeth being transitional. 
GENITALIA (plate XI, fig. B): Male organs: Penis-sac wide, 
rather long; penis very narrow, from four-fifths to seven-eighths the 
length of the penis-sac; penis retractor and penis-sac retractor of 
about equal length (as long as penis), separate, entering the columellar 
muscle in close proximity; protractor muscles four in number, two 
very narrow muscles posterior and two wide, powerful muscles an- 
terior; vas deferens a little longer than penis and penis-sac; prostate 
Vey 
be 
Distribution of 
‘UMBILICATA 


duct as long as penis; prostate long, ovate, flattened with rounded 
extremities, entering the prostate duct by a narrow construction; pos- 
terior portion of prostate very narrow. 
Female organs: First accessory albuminiparous gland very large, 
pyriform; lower portion of oviduct short and thick; receptaculum 
seminis ovate, its duct very narrow and about half as long as the vas 
deferens. The other organs as usual. The receptaculum seminis is 
salmon colored, but the other organs are flesh-colored or whitish. 
The genital organs, with the exception of the penis muscles, are 
very uniform in this species. In two specimens examined the penis 
retractor was attached to the penis-sac retractor about midway of the 
latter, and in one specimen one of the posterior protractor muscles of 
the penis-sac was attached to the latter at the same point as the penis- 
