274 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Description. — Carapace considerably broader than long, sides with 

 tAvo teetli behind the orbital tooth. Surface finely punctate and pu- 

 bescent. Eegions little marked; a gastro-cardiac sulcus; a depression 

 at the inner angle of the hepatic region; a sulcus between the 

 epigastric Icbes. 



Lower edge of front sinuous as seen from above, being arched over 

 the antennules; convex in front view; outer angles rounded; sides 

 oblique. Upper margin of orbit sloping backward and outward. 

 The orbital and two side teeth are sharp pointed, deeply separated, 

 and diminish in size from the first to the last; the first and second 

 are similar, their outer margin convex; the last is slender, outer 



margin straight. 



Epistome very 

 narrow, and in 

 front view concave 

 each side of the 

 middle. 



Inner half of 

 postorbital stridu- 

 lating ridge in 

 male very finely 

 striated ; outer half 

 formed of two 

 elongated tuber- 

 cles, the inner of 

 which is twice as 

 long as the outer, 

 and is continuous 

 with the striated portion; in the female there are four elongated 

 dentiform tubercles and at the inner end a few denticles. 



Outer surface of arm crossed by short squamiform rows of fine 

 granules; a very prominent lobe on the distal half of the inner 

 margin bears a horny ridge. Inner angle of wrist produced in a very 

 small tooth in the male, a spine in the female. Palms of male 

 swollen, smooth, above proximally marginate; fingers stout, with fine 

 prehensile teeth and a linear gape; a large patch of long hair occu- 

 pies the center of the inner surface of the chela. The chela of the 

 female is very small, upper margin of propodus complete, a ridge 

 on lower part of outer surface; fingers faintly grooved, more broadly 

 spooned than in male; inner surface of palm with a few hairs. 



Legs slender, hairy, carpal and propodal joints, save in the last 

 pair, densely pilose; merus joints crossed by short, granulated lines; 

 dactyli slender, of last pair curved upward at tip. 

 Abdomen of male very narrow, last joint suboblong. 



i 



Fig. 139. — TETRACRArsus jouyi, male (17496). a. Buccal 



CAVITY, X 8J ; b, ORBITAL AND ANTENNAL REGION, X 63 : 

 C, ABDOMEN, X 65. 



