400 A. E. Verrill — Marine JVemerteans of Nevi England, etc. 



Color light flesh-color or yellowish white with conspicuous bright 

 red median and lateral blood-vessels. 



Length 25™'° to 40™'". 



Vineyard Sound, 4 to 10 fathoms; off Newport, R. I., 3 to 8 

 fathoms. Not very common. 



AmphiporUS Virescens Vernll, Proc. Nat. Mus., p. 183, 1875. 

 Nemertes, sp. undet. (c) Yerrill, Invert. Vineyard Sd., p. 335, 1873. 



Plate .xxxiii, figures 4, 4fl, 45, 4c, 4f7, 4e. 

 Body, in extension, broadest anteriorly, rather depressed, long, 

 slender, tapering gradually to the rather attenuated posterior end. 

 Active in its movements. Head changeable in form, rather large, 

 in expansion usually ovate, broader than the body, depressed, and 

 obtusely rounded in front. A pair of faintl}'^ marked, nearly trans- 

 verse f ossfe runs up on each side .of the posterior part of the head, 

 crossing the rows of ocelli; farther forward and parallel with these 

 there is another pair of similar furrows that cross the eye- patches, 

 and beneath the head curve forward to the mouth. Ocelli numer- 

 ous, forming a long lateral cluster on each side of the head; ante- 

 riorly each cluster consists of three or more rows, but backward the 

 interior rows cease, finally leaving only the outer row, which ex- 

 tends back beyond the head and neck. Proboscis in partial exten- 

 sion clavate and covered with prominent papillae ; central stylet 

 with an oblong shank, which in one mounted specimen is light 

 greenish blue, together with the transverse, pigmented band near it. 

 Color clear light green, varying in tint. 



Length of largest specimen seen, about 40""". New Haven and 

 Noank, Conn.; Newport, R. I.; Wood's Holl, Mass., etc. Common 

 in shallow water among hydroids and ascidians, and on the piles 

 of wharves between tides. 



Amphiporus agilis VerriU. 



Ophionemertes agilis Verrill. Am. Jour. Science, vii, p. 45, pi. 1, fig. 1, 1873; Vpr- 

 rill, Expl. of Casco Bay, in Proc. Amer. Assoc, for 1873, p. 389, pi. 2, fig. 4. 



Amphiporus agilis Verrill, Notice of Recent Addit. to Mar. Invert , Part I, in Proc. 

 National Mus., ii, p. 183, 1879. 



Plate \.\.\v, figure 4. 

 Body versatile, slender and elongated in extension, slightly de- 

 pressed, with the sides well rounded, thickest in the middle, taper- 

 ing gradually to the slender, obtuse posterior end. Head some- 

 what separate from, and wider than, the anterior part of the body, 

 changeable in form, often oval, sometimes sub-triangular, generally 



