424 PROCEEDINGS OF THE NATIONAL MUSEtJM. vol. xxxV. 



The vermiform limb (fig. 4) has both apical lips serrately divided, 

 and with but a few spine-like setae on its margin. 



Caudal lamina each with eight rather slender spines and setae 

 (fig. 2), thus appearing as though sixteen in a row, the spines twelve 

 in a row, and larger, very faintly serrate ; the smaller four in number, 

 seta-like. 



Higher magnification of a claw (fig. 3) plainly shows character- 

 istic serrations, every eighth or tenth one being larger than the rest. 



Distribution. — British seas (Brady) ; Mediterranean Sea (Midler) ; 

 Scandinavian seas (Sars) ; California coast (Juday) ; Vineyard 

 Sound (Cushman) ; San Diego Bav, California, Cat. No. 13108; 

 U.S.N.M. 



27. CYLINDROLEBERIS LOBIANCI G. W. Muller. 



Plate LXIII, figs. 1-5; Plate LXV. figs. 3-7. 



Cylindroleberis lobiaci G. W. Muller, Die Ostracoden des Golfes von Neapel, 

 1S!>4. ]». 220, pi. iv, figs. 40-42; pi. v, figs. 2, 3, 26, 32, 34, 40. 



Dimensions of male. — Length, 5.25 mm. ; height, 3.G5 mm. 



Dimensions of female. — Length, 5.85 to G mm. ; height, 4.8 to 5 mm. 



Shell of the male (fig. 2) longer than that of the female (fig. 1) 

 and of different shape; the height being to length approximately as 

 1 to 1.45, while the shell of the female is approximately as 1 to 1.2, 

 thus being slightly oblong to almost circular in outline. Surface of 

 shell covered with small pittings in both sexes. 



The rostral incision is rather obliquely set, not deep, narrow, and 

 a little above the middle. 



First antennae rather stout, elongate, terminal segment short, about 

 one-fifth as long as the fifth segment; second segment with seven 

 lateral setae and three marginal outer ones, two of the latter long 

 and plumose; third segment about half as long as the second, outer 

 margin about twice as long as the inner, and armed with about seven 

 long plumose setae, most of them clustered at the outer distal margin. 

 Terminal spine stout, slightly curved, and as long as the part distal 

 to the fourth segment. 



About all the natatory setae of the second antennae armed on their 

 lower margins with a row of teeth (fig. 7). 



Inner rudimentary branch of the second antennae of the female 

 composed of three segments, the basal one as long as the other two, 

 with a tuft of short setae at its base, and seven to eight marginal ones. 

 Penultimate segment about one-half length of basal one, with four to 

 five short setae; terminal segment conical, and terminating in a long 

 ringed seta (Plate LXV, fig. 5). Occasionally another form of 

 branch is to be seen (Plate LXV, fig. 4), which, however, is evidently 

 that of the younger stages. This is usually four-segmented, the basal 

 segment with two or three short setae, antepenultimate segment with a 



