446 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



Color (Miers). — In spirit, light reddish brown above, white below; 

 a longitudinal band of white along middle of carapace on dorsal 

 surface. 



Range. — Yucatan Channel and West Indies; Fernando Noronha, 

 Brazil. Depth, 4 to 24 fathoms. 



Material examined. — 



Yucatan Channel, off Cape Catoche, Mexico; 24 fathoms; wh. R. 

 Co.; Jan. 30, 1885; station 2365, Albatross; 1 young female (16052). 



MayaguezHarbor, Porto Rico; 4 to 6 fathoms; Co.; temp. 68° F.; 

 Jan. 20, 1899; station 6065, Fish Hawk; 1 ovigerous female, holo- 

 type (23774). 



St. Croix, West Indies; 1 female (Copenhagen Mus.). 



Additional record. — Fernando Noronha, Brazil; 7 to 20 fathoms; 

 H. M. S. Challenger; 1 male (Brit. Mus.). 



Genus COELOCERUS A. Milne Edwards 



Coelocerus A. Milne Edwards, Crust. Reg. Mex., 1875, p. 84; type, C. spin- 

 osus A. Milne Edwards. 



Carapace swollen, spinose; rostrum in the form of a gutter open 

 below, the lateral margins folding under, and the extremity bifid; 

 orbit with a narrow buttonhole fissure above and below; preocular 

 angles spiniform; postocular cup squarish, strongly produced later- 

 ally. Basal antennal segment thick, outer-inferior margin bidentate, 

 outer-superior margin, bordering the orbit, also bidentate; movable 

 portion inserted below the involuted portion of the rostrum. Ocular 

 peduncles stout. Merus of outer maxillipeds a little dilated at outer 

 angle, deeply cut at inner angle for insertion of palp. Ambulatory 

 legs short, first pair not much longer than second. 



Contains only one species. 



COELOCERUS SPINOSUS A. Milne Edwards 



Plate 263; plate 264, figs. 1 and 2 



Coelocerus spinosus A. Milne Edwards, Crust. R^g. Mex., 1875, p. 85, 



pi. 18, figs. 2-2 b (type-locality, off Florida, 19 fathoms; holotype, young 



male. Cat. No. 1989, M.C.Z.). 

 Coelocerus grandis Rathbun, Proc. U. S. Nat. Mus., vol. 16, 1893, p. 79, pi. 5 



(type-locality, Gulf of Mexico, 35 fathoms; holotype, adult female, 



Cat. No. 9694, U.S.N. M.). 



Diagnosis. — Orbits prominent; rostrum ascending, involuted; 

 median spines 6; lateral spines 5. 



Description. — Covered everywhere, except on fingers and greater 

 part of ambulatory dactyls, with a short, close pile. Carapace 

 behind the orbits oval-orbicular, much swollen, armed with a definite 

 number of conical, subacute spines, between the spines closely 

 punctate. Median spines 6, 2 gastric, 1 genital, 2 cardiac, 1 intes- 

 tinal; a lateral gastric spine (paired) in advance of median spines. 



