164 Bulletin Vanderbilt Marine Museum, Vol. VI 



fifths of the rostrum ; the seventh tooth is distinctly smaller and 

 further apart than the sixth tooth, being nearly subapical, the 

 apex itself is acute; the inferior rostral margin has three teeth 

 placed approximately obliquely opposite the fourth, fifth and sixth 

 spines of the upper margin. The carapace has no grooving. There 

 is no preorbital spine ; the antennal spine is strong ; the hepatic 

 spine is acute, shorter than the antennal spine. 



The abdominal segments are compact, the third segment is 

 slightly convex in its median posterior margin ; the sixth segment 

 is about one and one-third times as long as the fifth segment, not 

 greatly elongated, and produced into a median lateral triangula- 

 tion on either side of the telson. The telson is one and three- 

 fourths times as long as the sixth segment; with a median 

 longitudinal sulcus dorsally, margined by paired dorsolateral 

 longitudinal low ridges on which are two pairs of articulated short 

 spines, a third similar pair of spines being distal in position ; the 

 distal telsonic margin is a shallow triangle, armed with a pair of 

 submedian long spines, and between these are six to eight long, 

 coarse, multispinose bristles. The uropoda are longer than the 

 telson, moderately large, ovate distally, the outer blade with a 

 subdistal tooth on the lateral margin, from which point the suture 

 curves inward. Both blades have the margin heavily fringed with 

 cilia. 



The eye is set upon a short conical stalk of less depth than the 

 large hemiovoidal black cornea, which is somewhat obliquely 

 placed, with excellent visual range in all directions. 



The antennulae have the first peduncular article elongate, ex- 

 panded beneath the eye ; the second and third articles are cylindri- 

 cal, subequal ; the flagellum is two-branched with the outer branch 

 deeply cleft, the proximal portion thickened and pilose ; the inner 

 branch is the longest of the three. 



The antennae have the basicerite strong; the scaphocerite is 

 almiost as long as the rostrum, and of moderate length, with the 

 outer lateral margin thickened and terminating in an acute spine 

 which extends beyond the inner distal portion, which is trans- 

 versally truncate, very slightly convex at the inner distal angle 

 and with the inner and distal margins fringed with setae. 



The mandibles carry a palp. The second maxilliped has no 

 podobranch. The third maxilliped is narrow and bears a vestigial 

 arthrobranch. 



