. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 234 TERRESTRIAL AIR-BREATIIING MOLLUSKS. Ariolimax niger, J. G. Cooper. Body long and narrow, blunt before, but little attenuated, and bluntly trun- cated behind, with the termination of the bo<ly not arched down to the tail as in Columbianus and Ccili/arnicus, but rather erect, giving the Fig. 133. appearance of being cleft, and showing much more plainly the caudal gland. Mantle (juite small, bluntly rounded before and behind. Color leaden below, blackish above. Length contracted in spirits about 30 mill.
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 234 TERRESTRIAL AIR-BREATIIING MOLLUSKS. Ariolimax niger, J. G. Cooper. Body long and narrow, blunt before, but little attenuated, and bluntly trun- cated behind, with the termination of the bo<ly not arched down to the tail as in Columbianus and Ccili/arnicus, but rather erect, giving the Fig. 133. appearance of being cleft, and showing much more plainly the caudal gland. Mantle (juite small, bluntly rounded before and behind. Color leaden below, blackish above. Length contracted in spirits about 30 mill. Dr. Cooper gives 2^ inches ^ , , - as the length of the living animal. Caudal pore of ° ° A. niger. Ariolimcix niger, J. G. Cooper, Proc. Phila. Acad. Nat. Sci., 1872, 147, PL III. Fig. B, 1-4. Found in the California Region. I have received specimens from Oakland, Bolinas, Santa Rosa, Ilealdsburg, Sonoma County. They all agree in their genitalia, as well as in outward form. This species preserved in alcohol is most readily distinguished by its smaller size, dark color, subcylindrical body, and especially by its bluntly truncated posterior termination, which is decidedly cleft at the mucus pore. The nature of the pore is described above (p. 229). Jaw (see p. 227). ArioUmax niger, also (PI. V. Fig. D), has the same type of dentition as A. Columbianus; the side cusps of the centrals are, however, more developed. On one specimen I found marginal teeth with one inner stout, short, rounded cut- ting point, and two shorter, rounded, side cutting points (see Fig. F), instead of the usual long cutting point. This is the only variation in the dentition of the genus which I have noticed. There are about 48—1—48 teeth. On opening the body of A. niger (PI. XII. Fig. F), the genitalia are found in the usual place, the testicle lying quite at the rear of the visceral cavity near the extreme point of the upper lobes of the liver, hardly imbedded in it, con- nected with the ovary by a l
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