160 BULLETIN 129_, UNITED STATES NATIONAL MUSEUM 



Range. — Florida Straits and Gulf coast of Florida. Depth, 15 to 

 27 fathoms. 



Material examined. — Gulf of Mexico; southwest of Cape San 

 Bias, Florida; lat. 29° 15' 30" N., long. 85° 29' 30" W.; 27 fathoms; 

 G.; February 7, 1885; station 2372, Albatross; 1 male (18129). Only 

 the body, the right cheliped and one of the second and of the fourth 

 pair of legs are preserved. 



Genus EUPLEURODON Stimpson 



Eupleurodon Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 1871, p. 98; 



type, E. trifurcatus Stimpson. — Miers, Journ. Linn. Soc. London, vol. 14, 



1879, p. 650. 

 Euplorodon A. Milne Edwards, Crust. R4g. Mex., 1878, p. 141. 



Allied to Epialtus, but with a depressed and uneven carapace; 

 antero-lateral angles strongly prominent, forming projecting teeth 

 directed forward, almost parallel to axis of body. Ambulatory legs 

 strongly prehensile, with dentigerous penult articles. Size small. 



West coast of America at Cape St. Lucas, Mexico, and Ferrol Bay, 

 Peru. 



KEY TO THE SPECIES OF THE GENUS EUPLEURODON 



A^ Carapace as wide between antero-lateral as between postero-lateral teeth. A 

 small tooth between antero-lateral and postero-lateral tooth. No preoc- 

 ular tooth trifurcatus, p. 160. 



A^. Carapace narrower between antero-lateral than between postero-lateral teeth. 

 No small tooth between antero-lateral and postero-lateral tooth. A 

 preocular tooth peruvianus, p. 161. 



EUPLEURODON TRIFURCATUS Stimpson 



Eupleurodon trifurcatus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 

 1871, p. 98 (type-locality. Cape St. Lucas; holotype not extant). — 

 Rathbun, Proc. U. S. Nat. Mus., vol. 38, 1910, pp. 535 and 572 (part). 



Euplorodon trifurcatus A. Milne Edwards, Crust. R6g. Mex., 1878, p. 142. 



Diagnosis. — Orbital arch without tooth. A small tooth on lateral 

 margin between the two large teeth or lobes. 



Description. — Carapace with a^deep depression in front of the gas- 

 tric region and one on either side of the cardiac region, which with the 

 gastric region forms a prominent median ridge. Branchial region 

 depressed, with a tubercle near the postero-lateral angle. Teeth and 

 prominences of the carapace generally setose. Rostrum half as long 

 as the postfrontal part of the carapace and one-third as broad as long, 

 flattened, truncate, and emarginate at extremity. Tooth at antero- 

 lateral angle half as long as rostrum and curving forward; the dis- 

 tance between the tips of these equals the greatest width of the cara- 

 pace, and is one-third greater than the middle width. There is a small 

 tooth on the lateral margin behind the antero-lateral angle. Orbital 

 margin arched but not toothed. Feet with an angular or dentated 

 carpus. (After Stimpson.) 



