234 



ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOL. 24 



Polyonyx confinis, new species 

 Plate 17; text-fig. 12(3) 



Types: Holotype, male, Allan Hancock Foundation Cat. No. 3817, 

 from Corinto, Nicaragua, 3 fathoms; January 5, 1938; collected during 

 Eastern Pacific Zaca Expedition of 1937-1938, New York Zoological 

 Society, at Zaca station 200 D-14. Paratype: same data as holotype, one 

 ovigerous female. 



Diagnosis: Carapace subovate, distinctly broader than long; front 

 transverse in frontal view ; merus with a strong lobe on anterior margin ; 

 anterior margin of carpus with a convex crest, its proximal end sub- 

 rectangular; outer margin of manus and pollex with a row of fine 

 granules and a thick fringe of plumose hairs; manus of both chelipeds 

 with a low longitudinal crest on dorsal surface; merus of walking leg 

 3 about twice as long as wide, its posterior margin with four or five 

 strong spinules; propodus with three posterodistal movable spinules, 

 that of leg 3 over twice as long as wide ; dactylus with two strong fixed 

 spines, the distal one composed of two nearly joined together, and with 

 a minute proximal spinule. 



Description: Carapace subovate, 1.3 to 1.5 times as broad as long, 

 strongly convex front to back, nearly smooth with light plications on 

 lateral regions, surface slightly uneven and regions well marked, lateral 



Text-fig. 12. Propodus and dactylus of walking leg of 1, Polyonyx quadriungu- 

 latus, X 25 ; 2, P. nitidus, x 32J^ ; 3, P. confinis, x 44^- 



