A. E. Verrill — Marine N'emerteans of New England. 451 



cerning the other specimens there are no memoranda, but from their 

 good condition it is more probable that they were all taken in the 

 trawl-wings than in the trawl itself. 



Hyalonemertes, gen. nov. 



Body elongated, fusiform, somewhat flattened, having no evident 

 constriction at the neck, nor marked marginal folds, except in the 

 caudal fin. Cirri wanting. Head not differentiated from the neck. 

 Caudal fin well developed. 



Proboscis long and slender, with a distinct bulb and sac, and, 

 apparently, having a small central stylet. Lateral pouches of the 

 intestine numerous, short, not much divided. Walls of the body 

 thicker and more gelatinous than in Nectonemertes, not showing 

 transverse striations, but covered with fine granulations ; inner mus- 

 cular layer longitudinally striated. 



Pyriform bodies not present in the head. Eyes apparently want- 

 ing. Neither ciliated grooves nor pits were noticed on the head. 



Hyalonemertes Atlantica, sp. nov. 



Body of the larger specimen moderately flattened, fusiform, about 

 four times longer than broad, gradually tapered both ways ; head 

 blunt, flattened ; caudal fin short, stout at base, a little broader 

 toward the end, which is thin and slightly emarginate. Along the 

 sides of the body the marginal fold is very narrow and indistinct, 

 the edges being rounded ; the folds become more evident posteriorly 

 and form the boi'ders of the caudal fin. 



The integument appears somewhat soft and gelatinous, and is 

 more translucent than in Nectonemertes, and not so firm. The whole 

 surface is covered with minute soft granules hardly visible to the 

 naked eye, but appearing, when magnified, something like fine 

 shagreen ; beneath the surface the longitudinal muscular striations 

 can be seen. The granulation of the surface is finer and less dis- 

 tinct on the head. The proboscis is not protuded in this speci- 

 men. The small mouth is just below the end of the snoiit; near the 

 upper margin there is a small round papilla. 



Length of the larger specimen, from Station 2724, 38'""'; breadth 

 of body 11™""; breadth of caudal fin 6"™. 



Length of the smaller specimen, from Station 2428, 20™"'; breadth 

 3-5""". 



The smaller specimen, just mentioned, is rather more slender than 

 the larger one ; its caudal fin is distinctly bilobed, with the lobes 



Trans. Conn. Acad. Vol. VIII. 59 Dec, 1892, 



