94 iS. J. Smith — Crustaceans of the Atlantic Coast. 



margin projects in an obtuse and rounded angle between the eyes, 

 and, beneatli the eye each side, the lateral margin projects into an 

 acute and spiniform angle, just above which there is a deep sinus in 

 the margin for tlie reception of the l)ase of the antenna. The trans- 

 verse sulcus is well-marked, strongly arcuate, and terminates eacli 

 side just above the antero-lateral spine. The lateral margin is bent 

 strongly upwai'd in an obtuse angle at a point about a third of its 

 length from the anterior margin. The jjosterior margin is only 

 slightly emarginate. The eyes are very large, their greater diame- 

 ter being more than a third of tlie breadth of the carapax, remote 

 from each other, and attached by very slender bases; they are very 

 nearly globulai-, though slightlv flattened above, and the black, 

 faceted area, occupying the greater portion of the surface, terminates 

 in a regular and slightly arcuate line above. The peduncles of the 

 antennulfe are only a little longer than the eyes, and the distal seg- 

 ment in each is as long as the two proximal, of which the second one 

 is very short, not half as long as the first and much shorter upon the 

 outer than upon the inner side. The flngella are stout and the outer 

 longer than inner, as usnal. In the adult male the segments of the 

 peduncle are stouter than in the female, the basal and terminal seg- 

 ments each being as broad as long, and the distal segment termin- 

 ates, beneath the base of the inner flagellum, in an obtuse, conical, 

 and densely hirsute or ciliated process similar to that in the males of 

 Erythrops and Parerythropf'. The squamiform appendage of 

 antenna (Plate XII, figure 2), is only about three times as long as 

 broad, the greatest breadth being toward the distal extremity; the 

 outer margin is nearly straight from near the base and terminates in 

 a very large dentiform spine. From the base of this spine the ante- 

 rior margin is very oblique, only slightly arcuate, scarcely longer 

 than the breadth of the scale itself, and terminates in an oval tip 

 which is about a third of the width of the scale in front of the tip of 

 the lateral spine. The innei- and terminal margins together are fur- 

 nished with nearly fifty seta?, of which about a third are on the term- 

 inal maro-in. The peduncle of the antennula does not reach to the 

 middle of the squamiform appendage, and the three distal segments 

 ai-e very short, the nltirnate and antepenultimate each being about as 

 broad as long and the two nearly equal in length, while the penulti- 

 mate is shorter than either. The flagellum is stout and probably 

 nearly as long as the rest of the animal, though, in all the specimens 

 examined, the terminal portion is wanting. 



The mandibles agree very closely, except in some of the details of 



