Studies on marine Oslracods 213 



ones and the rest. They are somewhat different from each other in length and strength, most 

 of them being moderately long and strong, some of those situated more anteriorly rather short 

 and weak. Some of these bristles, especially the short ones, are furnished only with short, 

 stiff secondary bristles, the others have wreaths of long, stiff secondary bristles in the middle 

 and short ones distally; the wreaths of secondary bristles are rather few on the anterior 

 bristles, more numerous on the posterior ones. The two or three posterior bristles — 

 whose long secondary bristles are of the same type as on the other bristles, stiff and 

 arranged in wreaths — are bare or have rather fine short hairs distally. Pilosity: The inner 

 side and the ventral part of the outer side of the second exopodite joint have numerous groups 

 of short, stiff, fine hairs. 



Seventh limb: — This is unusually long; we may mention that on two specimens, 

 one with a shell 15 mm. long, the other 14 mm. this appendage attained a length of 22 mm. 

 and 20 mm. respectively. The distal V7 of the limb is armed with bristles. The position and relative 

 length of the bristles is about as is shown in pi. II, fig. 11, Th. Scott, 1912 b, but we have, 

 however, to notice that whereas in this figure — presumably owing to a mistake — of the 

 proximal scattered cleaning bristles two are never fixed on the same side of one and the same 

 joint, in my specimens such a duplication is by no means vmcommon. The number of the 

 cleaning bristles varies from about 90 to about 130 — ^140 on each side, the numbers being, 

 however, very difficult to determine with certainty on account of the closeness of the bristles 

 to each other distally on the limb. The bristles (fig. 24) are armed distally with 1 — 10 beUs 

 which are most frequently distally cut obliquely; the tongue of the distal bell is also cut 

 somewhat obliquely; the presence of so few bells as one or two is, however, very rare. Proximally 

 of the bells the cleaning bristles are smooth. The end-comb (fig. 14) has about 90 — 150 teeth, 

 all of about the same type, i. e. fairly square distally and with a series of bristle-like secondary 

 teeth running across the middle. Dorsally between the end comb and the cleaning bristles 

 there is an unpaired and rather small and smooth chitinous peg (fig. 14). 



F u r c a: — This is of the same type as that shown in pi. II, fig. 12, Th. Scott, 1912 b. 

 The number of claws varies somewhat; the specimens from S/S „Michael S a r s" had 

 eleven to thirteen (the type specimen eleven); the specimen from M/S ,,A r m a u e r H a n s e n" 

 had ten; of the specimens from S/S ,,Antarctic" one had eleven -f twelve, the other 

 not less than fourteen + fifteen claws. Behind the claws the furca is bare. 



Upper lip and median eye: — These seem to correspond exactly to these organs 

 in G. Agassizi. The lateral eyes are very greatly reduced, and certainly do not function 

 as organs of sight. 



The number of embryos in the specimens from S/S ,,M i c h a e 1 S a r s" and M/S 

 ,,A r m a u e r Hansen" was about thirty to fifty; in the specimens from S/S ,,A n t a r c t i c" 

 there were 57 — 85. Several of the females with their embryos far developed had rather large 

 eggs in the ovaries, about twenty to twenty-five in each ovary. 



Male: — 



Shell: — Length 12—13 mm.; length : height : breadth about 12,5 : 10 : 9, i. e. the 

 height is comparatively a little less than in the females. The posterior aperture of the shell 



