REPORT ON THE OSTRACODA. 51 



both extremities are slightly produced ; height equal to two-thiixls of the length; seen 

 from above, the outhne is broadly ovate, with suddenly tapering and produced mucronate 

 extremities, twice as long as broad ; end view very broadly ovate, the greatest ■^ddtli 

 being below the middle, and almost equalling the height. Shell bro'wai and densely 

 hairy. Length, l-16th of an inch (r55 mm.). 



Dredged in lat. 38° 6' S., long. 88° 2' W., bottom of red clay, 1825 fathoms (Station 

 296); and in lat. 33° 42' S., long. 78° 18' W., 1375 fathoms, among giobigerina ooze 

 (Station 300). 



[PI. VIII. figs. 3, a-d. a Carapace seen from left side, h from above, c from IdcIow, 

 d from front. Magnified 30 diameters.] 



4. Bairdia simplex, n. sp. (PI. VII. fig. 1, a-d). 



Carapace, as seen from the side, oblong, subovate, nearly twice as long as high, 

 extremities rather narrow, evenly rounded ; dorsal margin arched, ventral straight or 

 slightly convex ; the outline, as seen from above, is compressed, ovate, about twice as 

 long as broad, widest in the middle, extremities subacuminate ; end view broadly ovate, 

 mdest in the middle, width equal to two-thirds of the height. Shell-surface smooth, 

 with a few scattered hairs. Length, l-20th of an inch (1'3 mm.). 



One or two specimens of this species were found in a dredging (Station 151) made ofi" 

 Heard Island, in 75 fathoms, on a muddy bottom. Were it not for its much more 

 elongated contour and larger size, it might have been referred to Bairdia villosa, to 

 which in other respects it bears a very close resemblance. 



[PI. VII. fig. 1, a-d. a Carapace seen from the left side, b from above, c from below, d 

 from front. Magnified 30 diameters.] 



5. Bairdia exaltata, n. sp. (PI. IX. fig. 2, a-d). 



Carapace, as seen from the side, subovate, highest in the middle ; height ecpal to 

 more than two-thirds of the length ; extremities evenly, and very broadly rounded, dorsal 

 margin excessively arched, ventral slightly convex ; seen from above the outline is ovate, 

 with compressed, though rather obtuse extremities, more than twice as long as broad, 

 the greatest width being in the middle ; end view ovate, much attenuated towards the 

 dorsal edge, widest in the middle, the greatest width equal to two-thirds of the 

 height. Shell-surface perfectly smooth, and polished. Length, 1-1 8th of an inch (•1"4 

 mm.). 



One or two specimens only of this fine and very distinct species were collected in a 

 cbedging from lat. 2° 33' S., long. 144° 4' E., 1070 fathoms. Bottom of giobigerina 

 ooze (Station 218). 



[PI. IX. fig. 2, a-d. a Carapace seen from left side, b from above, c from Ijclow, d from 

 front. Magnified 40 diameters.] 



