624 



placed it in his subfamily Corophina, found it subsequently appropriate to 

 regard it as the type of a separate subfamily, Helaince. As, however, I am 

 unwilling to accept any subfamilies, it is here retained within tlie family 

 CoropJdidw. Besides the northern form described below. Prof. Sidn. Smith 

 has recorded another nearly-allied species from the coast of New England 

 as iV^. phctf^ma. On the other hand, the form described by the Rev. Mr. Steb- 

 bing from the Challenger Expedition as N. serrata does not belong to this 

 genus, but is now believed by that author to be more properly a species of 

 the genus Melpliidippa. 



10. Neohela monstrosa, (Boeck). 



(PI, 224). 

 Hela monstrosa, Boeck, Crust. Araph. bor. & arct- p. 181. 



Body extremely slender and elongated, with the anterior part of the 

 body distinctly depressed, metasome very narrow, and nearly c3'lindric in 

 form. The 4 anterior segments of mesosome having the lateral parts some- 

 what expanded and angularly produced in front, those of the 3 posterior 

 segments slightly reflexed, and obtusely truncated at the tip. Urosome rather 

 slender, about eqxralling in length the last 2 segments of metasome combined. 

 Cephalon very short and broad, scarcely longer than the 1st segment ot 

 mesosome, and almost transversely truncated in front, lateral parts produced 

 on each side to a strong spiniform projection. Coxal plates extremel}' small 

 and far apart, the 3 anterior pairs terminating in front in an acute point. 

 Epimeral plates of metasome nearly obsolete. Eyes imperfectly developed, 

 and replaced on each side by a small patch of an opaque whitish pigment. ' 

 Superior antennse very slender and exceeding in length the whole body, 1st 

 joint of the peduncle comparatively short, 2nd very elongated, 3rd not atain- 

 ing half the length of the latter, flagelluni half as long again as the peduncle, 

 and composed of numerous short articulations, accessory appendage slender, 

 and nearly as long as the last peduncular joint, being composed of about 

 10 articulations. Inferior antennae still longer than the superior, basal 

 joint rather thick, and produced outside to a strong spiniform projection, 

 the last 2 joints of the peduncle very much elongated, and, like the peduncular 

 joints of the superior antennae, clothed all round with short spines, flagellum 

 somewhat exceeding the peduncle in length, and, like that of the superior ones, 

 filiform, multiarticulate. Anterior gnathopoda in female with the carpus oval 

 in form and densely aetous, propodos likewise densely setous, and scarcely 



