206 Bulletin Vanderbilt Marine Museum, Vol. V 



The chelipeds of the male are quite massive, subequal, about twice 

 as long as the carapace; the merus is trigonal, stocky, much shorter 

 than that of convexiis; the carpus of quadratus is rounded, with a dis- 

 tinct inner angle, but less emphasized than that of convexus; the palm 

 is similar in shape, very much deflected, laterally compressed with the 

 upper portion bent over toward the carapace; the outer surface con- 

 vex, smooth ; the lower lateral edge is more compressed and there is no 

 carina present, only a few rough, blunt granules on the lower inner 

 surface ; the lower finger is short, with a large subbasal molar and sev- 

 eral shallow small teeth. The upper finger curves downward and has 

 a rudimentary molar and similar small teeth. On the inner surface 

 both fingers have the heavy brush of setae which in this species extends 

 upon the palm to a much greater extent than in convexus, running 

 back obliquely on the upper half to near the proximal border. 



The ambulatories are of the same proportion and kind as in con- 

 vexus, but quadratus has the dorsal margin of the merus, carpus and 

 propodus much more setigerous. 



Eeperences: Macrophthalmus quadratus A. Milne Edwards, Nouv. 

 Archiv. Mus. Hist. Nat., t. IX, p. 280, pi. 12, fig. 6, 1873. 



