. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 232 TERRESTRIAL AIR-BREATHING MOLLUSKS. Internal plate of A. Columbianus. Limax Columbianus, Gould in Terr. Moll., II. 43, PI. LXVI. Fig. 1 (1851) ; U. S. Expl. Exped. Moll., 3, Fig. 1, a, & (1852). — Tryon, Am. Journ. Conch., Fig. 129. HI. 315 (1868). Ariolimax Columbianus, MoRCH, Mai. Blatt, VI. 110. —W. G. Binney, Am. Journ. Conch., I. 48, PL VI. Figs. 11-13; L. & Sh., I. p. 279, Fig. 499 (1869). Internal shell longer than broad, hexagonal, ends pointed. Specimens referred to this species have been f
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 232 TERRESTRIAL AIR-BREATHING MOLLUSKS. Internal plate of A. Columbianus. Limax Columbianus, Gould in Terr. Moll., II. 43, PI. LXVI. Fig. 1 (1851) ; U. S. Expl. Exped. Moll., 3, Fig. 1, a, & (1852). — Tryon, Am. Journ. Conch., Fig. 129. HI. 315 (1868). Ariolimax Columbianus, MoRCH, Mai. Blatt, VI. 110. —W. G. Binney, Am. Journ. Conch., I. 48, PL VI. Figs. 11-13; L. & Sh., I. p. 279, Fig. 499 (1869). Internal shell longer than broad, hexagonal, ends pointed. Specimens referred to this species have been found in Wash- ington Territory, Oregon, and California (Straits of Fuca to Santa Barbara,Cooper). It therefore inhabits the Pacific Region. In form, marking, and coloring it may be compared to Arion empiricorum of Europe. Dr. Cooper remarks : — " This large slug abounds in the dense damp forests near the Pacific Coast, and was not observed by me in the dry region east of the Cascade Mountains. It is to be found every month of the year in Washington Territory, being even more abundant in the rainy winter than in warmer seasons; its activity being checked only by extreme cold, while it cannot bear continued drought. It not unfrequently drops from the trees, etc. This slug grows to the length of six inches, but shrinks to a third of that size in alcohol. Its surface is smooth, not rugose, when alive, as represented in Dr. Binney's plate, and its color is a pale yellowish-olive, usually more or less blotched with ; (Pac. R. R. Rep. p. 377.) Jaw narrow, arcuate, dark horn or reddish; anterior surface with more than 15 coarse, crowded ribs, denticulating the concave margin (Fig. 128). Lingual membrane (see p. 231). On PL XII. Fig. C, I have figured the genitalia of A. Columbianus, which has a very large ovary against which the testicle lies, as in the following species. The ovary is so large as to take up one half of the entire visceral cavity, ex- tending compl
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