38 PROCEEDINGS OF THE ACADEMY OF 



convolution. The accessoiy gland is shown in 3, partiall}^ iml)edded 

 in the ovaiy. The ovaiT (11) is large and distinctly lobulated. 

 The oviduct (8) is narrow, ver^' long, greatly' convoluted. From 

 the testicle to about the middle of the course of the oviduct is a 

 stout thread-like organ, of unknown use to me, either a muscle, 

 nerve, or duct. It is not figured in my plate, as I am not certain 

 of its forming part of the genital S3'stem. The genital bladder 

 (9) is oval, large, with a short, stout duct (16). The penis is 

 inclosed in a long tapering sac (5), terminating in a decided fla- 

 gellum (15), in which I detected no capreolus. On the end of 

 the flagellum is a large, globular bulb. The retractor muscle of 

 the penis is attached to the roof of the general visceral cavity, 

 below the pulmonary chamber. It joins the penis at the com- 

 mencement of the flagellum. The vas deferens (7) is peculiar. 

 It leaves the prostate gland (4) as usual, runs alongside of the 

 vagina to the base of the penis, thence runs upwards, swelling to 

 an enormous extent, so as to equal the breadth of the penis, then 

 again becomes gradually reduced to its former size until, as the 

 most delicate thread, it enters the penis at the end of the flagellum 

 below the bulb. The penis did not appear in the animal extended 

 as drawn in the plate, but was twice recurved upon itself. There 

 is also a vaginal prostate (13), large, ear-shaped, close to the 

 exterior orifice of the female organs, which, with that of the male, 

 is described above (p. 34). 



On plate II. fig. c, I have figured the genitalia of A. Columhi- 

 anus? which also has a xevy large ovar^^ (11) against which the 

 testicle (1) lies as in the preceding form. The OA'ary is so large 

 as to take up one-half of the entire visceral cavit}^, extending 

 completel}' across the body, resting on the floor of the cavitj', its 

 ends recurved upwards so as to rest upon the liver on the upper 

 surface of the viscera. The body of the animal externally is 

 swollen by the large size of the ovary. The oviduct (8) is narrow, 

 long, greatly convoluted, ending in an extremely' long, convoluted 

 vagina. The genital bladder (9) is oval, large, with a short, stout 

 duct (16). The vas deferens (7) unlike that of the preceding 

 form, is as nsual in the land shells. It enters the penis (5) at its 

 summit, opposite the retractor muscle (6). The sac of the penis 

 is very stout, long, cylindrical. The external orifice is described 

 above (p. 34). 



