52 Bulletin Vanderiilt Marine Museum, Vol. V 



that curves forward behind the frontal region. There is also a dis- 

 tinct carina on either side of the anterior branchial region, extending 

 inward for about two-fifths of the width of the carapace, vanishing 

 in the median region. The mesogastric, hepatic and outer portion of 

 the branchial regions are finely granulose. The male belt is triangu- 

 late, consisting of five articles, the third, fourth and fifth being fused, 

 the distal segment triangular. 



The external maxillipeds are close-fitting, the merus with the distal 

 margin slightly oblique and the inner distal angle truncated for the 

 reception of the palp. 



The eye is large, the stalk short, the cornea bulbous, terminal. 



The antennulae are rather large and fold transversely beneath the 

 frontal border. 



The antennae have the basal article with its outer distal angle 

 acute, it is situated in the orbital hiatus ; the second and third articles 

 small, the flagellum very fine, multiarticulate, about as long as the 

 frontal margin. 



The chelipeds are equal, the merus rounded on the hinder, distal 

 end, the upper anterior lateral margin laminate, carinate and distally 

 acute; the carpus accentuated by the three longitudinal, elevated, 

 laminated carinae; the outermost of which extends along the outer 

 lateral margin; the second carina is median, terminating distally in 

 an acute point; the third and shortest carina extends the distal half 

 of the inner lateral margin and terminates in an acute distal tooth; 

 the propodus has the palm high, moderately inflated, the upper sur- 

 face ornamented by an outer and an inner longitudinal carinae which 

 are in line with the inner two carinae of the carpus and are separated 

 from each other by a wide, concave trough; a third, less elevated 

 longitudinal carina occurs on the outer face of the palm in line with 

 the outermost carpal carina. The fingers are two-fifths as long as the 

 palm, decidedly compressed laterally, with curved overlapping tips; 

 the upper finger is the more curved and has its upper margin cari- 

 nate; the cutting edges of both fingers meet and are set with small 

 irregular teeth. 



The ambulatories are quite long and slender, the first and second 

 pairs of legs subequal; the third pair slightly shorter, all with the 

 merus, carpus and propodus compressed, cylindrical, the dactyl 

 strong, tapered, with an acuminate tip. The fifth pair of legs are sub- 

 dorsal, shorter than the fourth and are natatory, the propodus and 

 dactyl being subovate, laminate. 



