120 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



aft, slightly so from side to side. Antero-lateral margins arcuate, 

 marked by a very slightly raised line which after making a rounded 

 turn at the lateral angle is continued obliquely on the dorsal surface 

 for a short distance. Margin of front slightly convex, not advanced 

 bej'ond the curve of the antero-lateral margins. Postero-lateral mar- 

 ginal raised line sinuous and oblique. Posterior margin sinuous. 



Ventral surface and margins of carapace clothed with soft hair. 

 Outer maxillipeds very small; inner distal angle of propodal seg- 

 ment fits against inner angle of merus, which is thickened and 

 clothed with hairs; merus-ischium subspatulate, curved; propodus 

 about as long as carpus, widening distally, truncate, and bearing on 

 the extremity at inner angle, a short, stumpy dactylus. 



Outer and upper surfaces of carpus and propodus of chelipeds 

 crossed by oblique rugae fringed wuth hair; propodus elongate, sub- 



a 



FlO. 07. DlSSODACTTLUS EXCOPEI, MALE (23430). O, OUTLINE OF CAnAPACE, X 0; 



1), TIIIKD LEG, X 10; C, ENDOUNATH OF OUTEtt MAXILLU'ED, X 40 ; d, FOUUTU LEG, X IG ; 

 e, CUELA, X 10. 



cylindrical; upper margin nearly straight, lower margin sinuous, 

 fingers deflexed, grooved, meeting when closed, tips acute, crossing, a 

 tooth at base of dactyl fitting in sinus of propodal finger. Chelipeds 

 of female more slender than of male. 



Legs sparingly fringed with long hair; dactyli 1-3 bifurcate for 

 less than half their length, forks slender, curved, acuminate and 

 largely horny; dactylus of last leg straight and sty li form. 



In male abdomen, segments 1 and 2 fused, slightly constricted at 

 middle, 3-G inclusive fused, sides slightly convex, last segment an 

 equilateral triangle; appendages of first segment not reaching last 

 one, straight and far apart until near tips Avhere they curve strongly 

 outward; tips acute and bearing a few hairs. All segments separate 

 in female abdomen, first half as long as second, second two-thirds as 



