9g BULLETIN 166, UNITED STATES NATIONAL MUSEUM 



CYMONOMUS QUADRATUS A. Milne Edwards 



Figure 23; Plate 30, Figure 3; Plate 31, Figure 3 



Cymonomiis quadralus A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, 

 p. 26, 1880 (tj'pe localities, from Havana to Grenada, 175-508 fathoms; 

 cotypes in M. C. Z.). — Bouvier, Bull. Soc. Philom. Paris, ser. 8, vol. 9, 

 p. 66 [13], 1898. — A. Milne Edwards and Bouvier, Mem. Mus. Comp. 

 Zool., vol. 27, p. 81, pi. 16, 1902. — Lankester, Quart. Journ. Micr. Soc, 

 new ser., vol. 47, pp. 448, 453, fig. 10 (upper), 1903. 



Diagnosis. — Carapace squarish, rostrum linear, eyestalks long, 

 without cornea. Merus of outer maxilliped elongate, the palp 

 attached at middle of inner margin. 



Figure 2Z.—Cymonomus guadratus, male (68094): Outline of carapace, X 3. 



Description. — Surface finely granulate. Anterolateral borders of 

 carapace almost on the same transverse line as the facial region, which 

 is very narrow. Rostrum slender and pointed, shorter than eyestalks; 

 the latter are partially movable and denticulate on inner border; 

 they do not reach the tip of the antepenult article of antennal pedun- 

 cle. Antennules stout, the peduncle about two-thirds as long as 

 carapace. Antennae shorter and slenderer; the peduncle does not 

 reach beyond the penult article of the antennules; subantennal tooth 

 visible in dorsal view. Anterolateral margins armed with some small 

 spines, posterolateral unarmed and parallel; posterior margin broad. 

 Chehpeds short, granulate; two spinules on inner margin of carpus; 

 fingers as long as palm. Ambulatory legs of first two pairs smooth. 



Measurements. — Female (6921), length of carapace to tip of rostrum 

 7.2, width 6.9 mm. 



Range. — Gulf of Mexico to Lesser Antilles; 101 to 508 fathoms. 



Material examined. — See table 30, page 97. 



Genus CYMOPOLUS A. Milne Edwards 



Cymopolus A. Milne Edwards, Bull. Mus. Comp. Zool., vol. 8, p. 27, 1880 

 (type, C. asper A. Milne Edwards). — Bouvier, Bull. Soc. Philom. Paris, 

 ser. 8, vol. 9, p. 66 [13], 1898. — A. Milne Edwards and Bouvier, Mem. 

 Mus. Comp. Zool., vol. 27, p. 74, 1902. 



Near Cymonomus; differs in its eyes normally developed, merus of 

 outer maxilliped not overreaching palp, antennules smaller and 



