50 THE VOYAGE OF H.M.S. CHALLENGEE. 



[PL VII. fig. 2, a-d. a Carapace seen from left side, h from above, c from below, 

 d from front. AH magnified 30 diameters.] 



2. Bairdia villosa, n. sp. (PL IIL fig. 3, a, b, PL Y. fig. 2, a-g, and PL VIII. fig. 4, 



Carapace, as seen laterally, subtriangular, highest in the middle, height equal to two- 

 thirds of the length ; extremities well rounded and not at all beaked ; dorsal margin 

 excessively arched, very high and subangular in the middle ; ventral almost straight ; 

 seen from above, regularly ovate with subacute and nearly equal extremities, twice as 

 long as broad ; end view broadly ovate. The shell is finely punctate, and densely 

 clothed with coarse brown hairs, many of which, especially towards the hinder extremity, 

 are very long ; colour, deep brown. Length, 1-1 8th of an inch (1'4 mm.). 



The antennae are more slender than is usual in this genus (PL V. fig. 2, a, b) ; the 

 anterior paii- seven-jointed, the posterior six-jointed (?). The terminal claws of the post- 

 abdominal rami (fig. 2, g) are two, one of them very long, and bearing towards the apex 

 a long seta and a number of short cilia, arranged in a pectinate manner along its 

 concave side ; the other claw, about half as long, and destitute of marginal setae ; the 

 inner margin of the ramus bears near its distal end, five long setae. In other respects 

 the animal exhibits the ordinary characters of the genus. 



The following is the list of dredgings in which Bairdia villosa has been found : — 

 off Nightingale Island (Tristan d'Acunha), 100 to 150 fathoms (Station 135) ; Balfour 

 Bay, Kerguelen Island, 20 to 50 fathoms (Station 149) ; ofi" Christmas Harbour, Ker- 

 guelen Island, 120 fathoms; off Prince Edward's Island, 50 to 150 fathoms; off" East 

 Moncoeur Island, Bass' Strait, 38 to 40 fathoms (Station 162). 



The characters of the species are sufficiently well marked ; it is less compressed, 

 larger and much more hirsute than Bairdia fusca, and much less tumid than the 

 following species, Bairdia hirsuta. In the Balfour Bay dredging there were a consider- 

 able number of specimens, but not so many in those from other localities. 



[PL III. fig. 3, a, b. a Copulative organs and postabdominal rami of the male, b 

 labrum. PL V. fig. 2, a-g. a Anterior antenna, b posterior antenna, c mandible, 

 d maxilla, e first foot with branchial plate attached, f second foot, g postabdominal 

 ramus. PL VIII. fig. 4, a-f. a Carapace seen from left side, b from above, c from 

 below, d from front, e right valve, / left valve ; the figures of the shell magnified 30 

 diameters.] 



3. Bairdia hirsuta, n. sp. (PL VIII. fig. 3, a-d). 



In general appearance very much like the preceding species, but more tumid, more 

 compressed at the extremities, and slightly beaked behind ; seen from the side, the dorsal 

 margin is not so strongly arched as in Bairdia villosa, the ventral margin is convex, and 



