no. 1651. REPORT OX THE OSTRACODA— SIlAh'I'i:. 427 



Seen from the side, the shell is about twice as long- as broad (fig. 

 1), ventral margin very much curved, dorsal margin less so; antenna! 

 notch narrow, vertical, and with a small tuft of seta?; rostral arch 

 much produced, posterior extremity much produced into a conspicu- 

 ous beak which is gently curved ventrallv, but dorsally forms a very 

 decided angle with the shell (fig. 1). 



Secondary branch of the second antenna is formed of six seta 1 

 (fig. 3). The vermiform limb is armed at tip with five slender 

 curved claws (fig. 2). 



Furca with nine toothed spines (fig. 4), of which the second or 

 subterminal one is united with the f ureal plate, the remainder being 

 plainly articulated to the plate. 



The upper lip (fig. 5) as seen'from the side is very strikingly de- 

 veloped, the hindmost tooth being the largest and notched, the others 

 finger-like. 



The pigmentation, which is supposed to be the seat of its ability to 

 produce phosphorescent light, shows plainly as a dark pigmentation. 

 I have never seen anything of like character associated with any other 

 Ostracoda. 



One specimen studied by me w T hich was collected by the Bureau of 

 Fisheries Steamer Albatross, Station 3921, May G, 1902, 8.45 p. m., 

 night anchorage; surface; off Honolulu. 



18. Genus PHILOMEDES Lilljeborg 1853. 

 Cypridina Authors, 1853. 

 Eurypylus Brady, Descriptions of Ostracoda, Les Foods de la Mer, 1867 



1886, Bordeaux, I, p. 141, pi. xvm, figs. 1, 2. 

 Philomedes Lilljeborg, Oni de inoru Skane for. Crust, af ord. Cladocera, 



Ostracoda och Copepoda. Lund., 1S53, p. 175. — Baird, Proc. Zool. Soc. 



Lond., XXVIII, 1860, p. 202.— Sars, Arch. Math. Naturv. Christiania, 



XII, 18S7, p. 45.— Brady and Norman. Trans. Royal Dublin Soc, Pt. 2. 



1S96, p. 653. — G. W. Muller, Die Ostracoden des Golfes von Neapel, p. 



207, 1004, pi. in, figs. 1-33, 36-44.— J uday, Univ. of Cal. pubs., Ill, 1907, 



No. 9, p. 139. 

 Bradycinetus Sars, Forh. Vid. Selsk. Christiania. 1865, p. 109. — Beady, 



Trans. Linn. Soc. Lond., XNVT, 1868, p. 466. 



Shell always with a distinct rostral sinus which is overhung by ;i 

 broad, blunt rostral process. First antenna six-segmented, with 

 medium long, sparsely plumose setse, and female with no sensory seta 1 . 

 Second antenna with a weak secondary branch. Secondary branch 

 of second antenna of male three-jointed, prehensile, the last joint re- 

 flexed upon the second. First maxilla of female rather large and 

 strong; of male indistinctly joined, weak, and armed with delicate 

 seta?. Second maxilla of female with two rather large teeth at its 

 anterior angle, the inner tooth the smaller and bifid; the maxilla of 

 the male without teeth. Eyes of female rudimentary or lacking; 

 those of male well developed. First pair of legs more or less dis- 

 tinctly jointed. 



