A. E. Verr'dl — Mdriue JVeinertcaus of New EiKjland, etc. 419 



PoUa ohscura Girard iu Stimpsou's Marine Invertebrates of Graud Manaii, p. 82, 



1853 (no description). 

 Nemertes viridis Diesiug, yiczuugsbericlito der kais. Aliad. der Wissenschafteu, 



vol. xlv, p. 305, 18G2. 

 Bmiasia olivacea Johnston, Catalogue British Nou-parasitical Worms, jj. 21, pi. 2'', 



fig. 1, 1865; Mcintosh, Trans. Roy. Soc. Edinb , vol. xxv, pt. ii, p. 371, 1869. 

 Lineus wmfe Johnston, Catal., pp. 27, 296, 1865. 



Nemertes viridis Verrill, Marine Invert of Vineyard Sound, etc., p. :J34 [628], 1873. 

 Lineiis Gesseretisis Mcintosh, Hist. British Annelida, Part I, Nemerteans, (Ray 



Society) p. 185, pi. iv, fig. 2; pi. v, fig. 1, (red var.); pi. xviii to xxii, (anatomy); 



pi. xxiii, (green var., embryology), 1873. 

 Linens viridis Verrill, Check List Marine Invert., p. 12, 1879; Notice of Recent 



Addit. to Mar. Invert., Part I, in Proc. National Mus., ii, p. 185, 1879. 



PLATE XXXV^I, FIGURES 5 to 5^ ; PLATE XXXVIII, FIGURES 6 tO 6C? ; 

 PLATE XXXIX, FIGURES 18, 22. 



Budy soft, very contractile and changeable ; in full extension 

 elongated and moderately slender, in large examples six to eight 

 inclies long and abont one-lifth of an inch iu diameter ; usually thick- 

 est in advance of the middle, tapering gradually to the rather slender 

 caudal portion, and decreasing less toward the head; not iinfrequently 

 the body is dilated in two or more places at the same time, the 

 swollen parts moving continually ; in extension the body is usually 

 Romewdiat flattened, but tlie dorsal surface is decidedly convex and 

 the sides well-rounded ; it is often crossed by faint, light-colored, ir- 

 regularly si)aced wrinkles. In contraction the body becomes short 

 and thick, oblong, swollen and almost saccular at times. 



Head, in extension, rather large, dei)ressed, usually wider than the 

 neck, short, ovate-spatulate, or elongated, accoi-ding to the degree of 

 extension ; the snout is blunt, often emai'ginate, and bears three 

 small ciliated papilhe ; proboscis-pore terminal, rounded, or in the 

 shai)e of a short vertical slit ; lateral foss:i? long and very deep, with 

 wide, thin, pale margins, above and below, the anterior ends of the 

 slits reaching close to the proboscis-})ore. 



The ocelli are arranged in a simple row on each side of the head, 

 close to the edge of the dorsal pigmented region ; they vary in 

 number and size according to the age, the large specimens often hav- 

 ing six or eight on each side, while the small ones have but three or 

 four, and the very young ones have only a single pair ; usually the 

 anterior ocelli are slightly larger than the others. 



The mouth is situated opposite to, or a little behind, the posterior 

 ends of the lateral fossae ; it is ordinarily small and elliptical, with 

 a distinct, lighter colored border, but it is capable of great dilation 



Trans. Con-v. Acad., Vol. VIII. 55 .June, 1892. 



