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333 



Type locality. — Koh Lan, 30 fathoms, mud; III. 2; one ovigerous female. 

 In P. alcocki the fourth leg is decidedly longer than the first and second and 

 lis (hiclylus is the longest of all. 



Pinnotheres quadratus Rathbun. 



I'innollicrcs quadraliis Rathjiun, Proc. Uiol. Soc. Washington, XXII, 110, 1909. 



Belongs to Bürger '.s section I', in which the dactylus of the outer maxilliped 

 is styliform, inserted on the inner margin of the propodus, and to section d, in which 

 the third and fourth ambulatories are longer than the first and second; the carapace, 

 however, is scarcely broader than long. The dactylus of the maxilliped does not 

 nearly reach the end of the propodus; the third pair of legs is the longest, and 

 the dactyli of the third and fourth pairs are subequal. This brings the species near 

 P. palaensis Bürger- which, however, is hexagonal in form, and noticeably broader 

 than long. 



Carapace subquadrate, with rounded corners, its length and breadth about 

 equal (length 5'2 mm., breadth 5'3 mm.); convex in all directions, thin. Orbits 

 ventral, transversely oblique, eyes pigmented on the ventral side near the tip; orbits 

 and antennae occupying one-third width of carapace. 



The propodus of the maxilliped is large and spatulate and overreaches the 

 inner angle of the merus; the dactylus is very small, linear, 

 reaches exactly to the inner angle of the merus and is 

 scarcely visible when the maxillipeds are folded in place, 

 being hidden beneath the merus. 



The single cheliped (on the left side) is stoutish; the 

 palm widens distally, is slightly more than twice as long as 

 high, and nearly twice as long as the stout fingers, which 

 meet along their apposed edges, the tips curved inward, the 

 dactylus overreaching the pollex; a large tooth near the 

 base of the dactylus fits between two smaller teeth on the 

 pollex. 



Legs slender; the third leg (the longest) is 125 times 

 as long as the carapace; on the right side of the unique 

 type this leg is abnormally shortened. Fourth leg slighth' 

 longer than second, second slightly longer than first. Third merus longest, 

 first, second and fourth subequal; carpus of all the legs subequal; third propodus 

 longest, first, second and fourth subequal ; third and fourth dactj'li longest, sub- 

 equal, first and second dactyli subequal. 



Type locality. — Koh Chang, 1 fath., coral; I— III; 1 ? ovig. 



' Zool. Jahrb., Syst., VIII, 3ö2. 1895. 



- Zool .lahrb.. Syst, VIII, lil-l, pl. IX, fig V2, pl. X, fig. 12. 



Fig. 13. 

 Pinnotheres quadratus, 

 type 9. 5-3 mm. wide: 

 a, maxilliped; b, chela. 



1). K. I). Vidensli.Selsk. SUi-. 



. H;ekke. n:itui%i(lensk cjj; iiiatllen). AfU. V. 4. 



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