ARIOLIMAX. 



233 



ArioUmnx CaUfornicm, J. 0. Coopkr, Proc. Acad. Nat. Sc. of Phila., 1872, 146, 



PI. 111. Fig. 1), 1-3. 

 In the California Province, around San Francisco, and in the Sierra Nevada 

 (latitude 39°) of the elevation of 3,500 feet. 



Fig. 131. 



A. Calif ornicus, contracted in spirits. 

 Jaw (see p. 227). 



The lingual membrane (PI. V. Fig. F) has the same type of dentition as in 

 A. Columbianus, but the bases of attachment are more developed, and are pro- 

 duced beyond the reflection at their upper margin. There are 80 — 1 — 80 teeth, 

 with 9 perfect laterals. 



The genital system of A. Cali/ornicus is figured in D of PI. XII. The 

 testicle does not lie far away, imbedded in, or resting on, the upper lobes of 

 the liver, but lies close against the ovary, in the semicircle formed by the 

 recurving of the apex of the ovary upon itself. In this respect, the posi- 

 tion of the testicle is different from that of most slugs, and affords an ex- 

 cellent specific character. The testicle is kidney-shaped, as it is covered 

 by its investing membrane. It appears to consist of closely bound fasciculi of 

 short, white, tubular, not aciniforra caeca. The epididymis is short, and still 

 more shortened by its excessive convolution. The accessory gland is partially 

 imbedded in the ovary. The ovary is large and distinctly lobulated. The ovi- 

 duct is narrow, very long, greatly convoluted. The genital bladder is oval, large, 

 with a short, stout duct. The penis is enclosed in a long tapering sac, termi- 

 nating in a decided flagellum, 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 cham- 

 ber. It joins the penis at the commencement of the flagellum. The vas 

 deferens is peculiar. It leaves the prostate gland as usual, runs 

 alongside of the vagina to the base of the penis, thence runs up- 

 wards, 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 sac did not appear 

 in the animal extended as drawn in the plate, but was twice 

 recurved upon itself. There is also a vaginal prostate, large, 

 ear-shaped, close to the exterior orifice of the female organs, 

 which, with that of the male, is described above (p. 229). 



For other anatomical details, see p. 229 et seq. The internal shelly plate 

 there described is here fijiured. 



Fig. 132. 



Internal 



plate of A. 



Cali/ornicus. 



