NATURAL SCIENCES OF PHILADELPHIA. 255 
The vagina is very long, the penis enters it at its lower ex- 
tremity near the exterior opening of the genitalia. | 
For the sake of comparison, we have also given figures of the 
genitalia of two other Pacific subgenera, Arionta and Aglaja. 
In Helix Townsendiana, Lea (Arionta), see plate I. fig. 4, we 
detected the accessory gland of the epididymis (3), composed of 
several acini of different sizes. The genital bladder is lengthened 
oval (9), and differs greatly from that of Helix Newberryana in 
having a very short, stout duct. At the opening of the penis there 
is a decided enlargement, perhaps of the nature of a prepuce, or 
prostate. The vas deferens enters the penis below its apex. 
The retractor muscle is at the apex of the penis. There seems 
no accessory organ, the genitalia being reduced to their simplest 
type. 
Of Aglaia we have examined two species, H. fidelis, Gray, and 
H. infumata, Gould. The genitalia of these are almost exactly 
similar. In neither have we detected any accessory gland to the 
epididymis. In both the penis is extended into a decided fla- 
gellum (15). The vas deferens (7) enters below the flagellate ex- 
tension (15). The retractor muscle (6) is attached on the oppo- 
site side and still lower down. ‘There is a well-marked prepuce 
(12). Opposite the entrance of the penis on the other side of the 
vagina, which is here considerably swollen, is a small sac-like 
organ (14), ending in a smoothiy rounded cul-de-sac, of what use 
in the economy of the animal is unknown to us, unless it be a 
rudimentary dart sac. There was no appearance, however, of a 
dart within it. Just above this organ opens the stout duct of 
another organ (13), cylindrical, bluntly pointed, hollow, of a 
reticulated appearance. There is a contraction where this organ 
joins its duct, which is of about the same size. The two together 
are about as long as the penis with its flagellum, and stouter. No 
dart was noticed within this organ. It is, no doubt, a form of 
vaginal prostate, as described by Moquin Tandon. The genital 
bladder (9) is globular. Its duct is long, free in the upper half 
of its course. The oviduct, ovary, genital bladder, testicle, etc., 
of H. infumata, fig. 2, are not figured by us. They are as in H. 
fidelis, fig. 5, excepting the testicle, which is as in H. Newber- 
ryanda. 
Fig. 4. Genitalia of Helix Towsendiana, Lea. Same reference 
as in Fig. 5, excepting 3, the accessory gland of the epididymis. 
