46 



BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



CYRTOPLAX SPINIDENTATA (Benedict). 



Plate 11. 



Eucratoplax spinidcntata BENEDICT, Johns Hopkins Univ. Circ., No. 11, 



1892, p. 77 (type-locality, Jamaica; holotype male, Cat. No. 17219, 



U.S.N.M.). 

 Eucratopsis spinidentata RATHBUN, Bull. U. S. Fish Comm., vol. 20, for 



1900, pt. 2, 1901, p. 11. 

 Cyrtoplax spinidentata RATHBUN, Proc. U. S. Nat. Mus., vol. 47, 1914, p. 



119, pi. 2. 



Diagnosis. Hexagonal, very broad. Eyes narrowing distally. 

 Wrist two-spined. Buccal cavity widening anteriorly. Legs slender. 

 Third abdominal segment narrower than the sternum. 



Description. Carapace more convex longitudinally than trans- 

 versely ; lateral teeth upturned. Front between a third and a fourth 

 of the width of the carapace, deflexed, lobes slightly convex, median 

 notch V-shaped. The orbits trend forward and outward, and there is 



a shallow lobe between the two 

 upper fissures; below the blunt 

 outer angle, a large sinus; the 

 feeble inner tooth is situated be- 

 low the middle of the eyestalk 

 which is narrow except at the base 

 and fits snugly in the orbit. Of 

 the five antero-lateral teeth, the 

 second is lobiform and separated 

 from the orbital angle by a shallow 

 FIO. 20. CIRTOPLAX SPINIDENTATA, MALB sinus ; third tooth more or less 



HOLOTYPE, OUTER MAXII.UPED8, SHOW- j , ,_*-.. ./ , ^Al, J C*U 



ING APPROXIMATION, x o. truncate ; fourth and fifth spmi- 



form, subequal; carapace widest 

 at the last tooth. Postero-lateral margins moderately convergent. 



Arm provided with a strong superior subterminal tooth. Wrist 

 with a deep sulcus parallel to the margin next the palm, and two 

 stout spines at the inner angle, one below the other, the upper one 

 the longer. The palms are convex above and below, and the upper 

 margin is granulate. The fingers are slender, much deflexed and 

 curved inward ; the dactyli are granulate above at the proximal end ; 

 the fingers are irregularly toothed along their prehensile edges which 

 gape narrowly. The meral and carpal joints of the legs are hairy 

 along the anterior margins, the propodi along both margins; the 

 dactyli have four fringes of hair. 



The first segment of the male abdomen is wider at its proximal 

 than at its distal end, where it is the same width as the second seg- 

 ment ; the third segment forms narrow but obtuse angles at its widest 

 part. 



