. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 214 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. fornia coast are in the number of proboscidial nerves and the char- acter of the armature of proboscis (see p. 215). It is possible that collections in intermediate localities, as Puget Sound, will bring to light forms M'hich show an intergradation between these two sup- posed species, thus uniting them into a single s])ecies showing considerable varia- FiG. 35.~Zygonemertes tha- . j? i â lassina. Accessory stylets. tion in Structure ot proboSClS. 45. Zygonemertes virescens
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 214 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. fornia coast are in the number of proboscidial nerves and the char- acter of the armature of proboscis (see p. 215). It is possible that collections in intermediate localities, as Puget Sound, will bring to light forms M'hich show an intergradation between these two sup- posed species, thus uniting them into a single s])ecies showing considerable varia- FiG. 35.~Zygonemertes tha- . j? i â lassina. Accessory stylets. tion in Structure ot proboSClS. 45. Zygonemertes virescens (Verrill) Montgomery. Amphiporus virescens Verrill, Proc. U. S. Nat. Mus., 2, p. 183, 1879; Trans. Conn. Acad., 8, p. 400, PI. 33, figs. 4-4e, 1892. Zygonemertes nirescens Montgomery, Zool. Jahrb., Syst., 10, |). 2, 1897. PI. 22, figs. 141-144. This common New England species occurs in considerable num- bers on the piles of wharves in the harbors of Monterey, San Pedro, and San Diego, California. It may be recognized by the following characters: â Body slen- dei", rather depressed, head variable in shape, often wider than parts immediately following, provided with two })airs of oblique furrows as usual; anterior pair of furrows situated about half-way between brain and tip of snout when moderately extended, conspicuous on lateral margins when head is somewhat compressed. 6'ize. â The individuals collected in California were all of small size, although sexually mature. They measui'ed only from 5 to 20 mm. in length, and were usually from to 1 mm. wide. On the coast of New England the same species may become 40 mm. long, although the usual size is 25 mm. or less. âUsual color pale green, although some individuals, especially when immature, are flesh colored anterioi-ly, becoming pale green towards intestinal region, while others are yellowish green or pale olive green throughout. A few of the smaller indi- viduals found at Monterey were cream colored in life,
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