188 Bulletin, Vanderhilt Marine Museum, Vol. Ill 



the spine which terminates the dorsal carina ; the hinder margin is 

 incised similar to that of the preceding segment, but the lateral mar- 

 gin of the pleura is more convex, the postlateral angle acute. There is 

 a median longitudinal carina extending the length of the first to 

 fifth segments, inclusive, but which is weak on the first and second 

 segments, but increases in strength successively on the third, fourth 

 and fifth segments, terminating on the posterior margin of the latter 

 in an acute tooth. On the sixth segment this carina is replaced by a 

 pair of submedian carinae, each of which terminate in a short spine 

 and which are separated throughout their entire length by a concave 

 groove ; the posterior margin is produced into an acuminate, triangu- 

 lar process on either side at the outer base of the telson and the lower 

 postlateral angle of the segment bears an acute tooth. The telson is 

 narrow, tapering to an acute point, a median longitudinal groove 

 throughout its length; three pairs of articulated spines on the distal 

 lateral margin; one pair subdistal to the apex of telson; the second 

 pair halfway between the first and third pairs, which latter is about 

 one-third the length of telson from the apex. The uropoda are about 

 as long as the telson, the inner blade slightly narrower than the outer, 

 with a pronounced median rib ; the distal margin narrowed, rounded 

 eiliate; the outer blade has a blunt, subdistal tooth at the terminus 

 of the lateral margin, the distal margin is more widely rounded than 

 that of the inner blade and is ciliated ; there is an oblique rib running 

 from the base to the tooth on the outer lateral margin, also a median 

 rib which is separated from the outer one by a groove. 



The eyes are set close together on substantial cylindrical stalks, di- 

 rected upward ; the cornea terminal, spherical, a small, rounded pro- 

 jection of the stalk on the inner distal margin. 



The antennulae have the basal article greatly elongated, extending 

 beyond the eyes ; the inner part cylindrical but flattened beneath the 

 eyes and with a heart-shaped process on the outer side, bent up, form- 

 ing a lateral shield for the eye ; the second and third joints are suc- 

 cessively shorter and smaller than the first; the flagella are slightly 

 unequal, the smaller one consisting of 13 rings and the larger, 18 rings ; 

 the inner whip with a thick brush of cilia along its lower outer side. 



The antennae have the proximal joint small, a tooth at the upper 

 distal angle; the scaphocerite is large, the outer margin nearly 

 straight, terminating in an acute tooth, which extends slightly farther 

 than does the rounded margin of the inner distal portion. The inner 

 margin of the scaphocerite is convex, the widest point being situated 



