130 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



the fourth pair with numerous stout spines along its internal edge, 

 these becoming fewer and weaker on posterior pairs, which are more 

 abundantly furnished with long slender setae, 

 the fifth joint of last pair of legs broad and 

 almost rectangular. 



"Abdominal appendages subsimilar, the uro- 

 pods not projecting beyond the margin of tel- 

 son, attached to underside, in structure similar 

 to the pleopods and probably branchial in 

 function. 



"Color gray, with arborescent brown pigmen- 

 tation becoming more dense posteriorly, on 

 abdomen collected principally in a median 

 wedge-shaped mass with the apex on base of 

 telson, each segment of pleon with two subellip- 

 tical paler lateral areas, with about twenty-five 

 to thirty longitudinal lines of pigmentation, the 

 areas between which are reticulated with brown. 

 lopus Mandibles, legs, and underside of body more 

 MTTOKALIS (AFTER or less pigmeiited. 



^f "One specimen, from station 6079, 20 fath- 



oms, 6 by 2.2 mm." MOORE. a 



24. Genus BATHYNOMUS A. Milne Edwards. 



Second pair of antennae with a peduncle composed of five articles; 6 

 rudimentary scale attached to end of peduncle of first antennae. 



The plate of the second article of the maxillipeds furnished with 

 hooks. 



Abdomen with all six segments distinct. 



Pleopoda with supplementary ramified branchiae developed at the 

 base of the inner branches. 



BATHYNOMUS GIGANTEUS A. Milne Edwards. 



Bathi/nomus giganteus A. MILNE EDWARDS, Compt. Rend. Acad. Sci., LXXXV1II, 

 1879, pp. 21-23; Ann. Mag. Nat. Hist. (5), III, 1879, pp. 241-243. FILHOL, 

 La vie au fond des Mers, 1885, p. 147. MARSHALL, Die Tiefsee und ihr 

 Leben, 1888, p. 261, fig. 86. AGASSIZ, Bull. Mus. Comp. Zool., Harvard 

 College, XV, 1888, p. 49, fig. 252. HANSEN, Vidensk. Selsk. Skr. Math, og 

 Naturvid., Afd. (6), V, No. 3, 1890, pp. 252, 318, 378. WOOD-MASON and 

 ALCOCK, Ann. Mag. Nat. Hist. (6), VII, 1891, p. 270. ORTMANN, Proc. Acad. 

 Nat. Sci. Phila., 1894, p. 191. BOUVIER, Bull. Soc. Entom, France, 1901, 

 pp. 122-123; Compt. Rend. Acad. Sci., CXXXII, 1901, pp. 643-645. A. 

 MILNE EDWARDS and BOUVIER, Mem. Mus. Comp. Zool., Harvard College, 

 XXVII, No. 2, 1902, pp. 141-159, pis. i-vi. HANSEN, Journ. Linn. Soc. 

 London, Zool., XXIX, 1903, pp. 12-25, pi. iv, figs. 8-9. 



oBull. U. S. Fish Comm., XX, Pt. 2, 1902, p. 168. 

 6 See remarks at end of description. 



