152 Bulletin Vanderbilt Marine Museum, Vol. VI 



telson and an outer small pair of triangulate spines, one each at the 

 base of the telsonic margin. The median distal margin of the 

 telson, between the pair of larger spines, is beset with thick 

 longish bristles. On the distal half of the dorsal telsonic surface 

 there are two pairs of well spaced, acute, articulated spines, in 

 longitudinal series; the ventral surface of the telson is a deep 

 trough. The uropoda are nearly one-third longer than the telson ; 

 the peduncle is short, produced into a laminate, triangulate point 

 at the base of the outer blade ; the outer blade is wider and slightly 

 longer than the inner blade and more evenly rounded distally, 

 with the outer margin thickened and tapered to an acute subdistal 

 tooth ; the inner blade is more narrowed distally and somewhat 

 unequally tapered. 



The eye is set obliquely upon a short stalk and is hemispherical 

 with a small ocellus beyond the corneal margin. 



The antennulae are not quite as long as the antennae and have 

 the peduncular articles not quite so long as the rostrum, termi- 

 nating about opposite the predistal rostral spine. The first article 

 is expanded, concave beneath the eye and laminate distally, with 

 the outer lateral margin thickened and armed with a small acute 

 tooth proximally and a stronger acute tooth distally; the inner 

 distal margin is bluntly rounded and ciliate ; the second article is 

 thickish, cylindrical, produced into a thick, triangulate tooth at 

 the outer distal angle and a similar but more cylindrical tooth at 

 the inner distal angle; both projecting beside the base of the third 

 article, which is smaller, cylindrical; the flagellum is three- 

 branched, multiarticulate, the superior branch being decidedly the 

 thicker one proximally. 



The antennae have the basal article thick, with a blunt rounded 

 upper margin succeeded by an acute tooth at the outer lateral 

 angle ; the second and third articles lie beneath the scaphocerite, 

 together extending about midway its length ; the multiarticulate 

 flagellum is very long. The scaphocerite is very large, with the 

 tip extending slightly beyond the rostrum. The outer margin of 

 the scaphocerite is nearly straight, thickened, and terminating 

 in an acute subdistal spine; the distal margin is rather evenly 

 rounded and the inner lateral margin is moderately convex, widen- 

 ing toward the proximal portion. The outer half of the dorsal sur- 

 face of the scaphocerite is emphasized by the longitudinal carinae, 



