THE OSTKACODA. 



255 



Coitchoecia ; it is possible that (as certainly happens in rotaiulata) the opening shifts 

 forward with suceessivc moults. 



Shell very elongate, the length about twice the height; dorsal border straight; 

 ojiening of left asymmetrical gland about \ of the border from the poster o -dorsal 

 angle. Posterior border a steady curve, meeting the ventral border without any 

 postero-vcntral angle; ventral border parallel to dorsal border, slightly arcuate 

 centrally; the anterior border beginning very far forward. The right asymmetrical 

 gland in the usual position. Frontal organ with three long flue spines dorsally, and 

 about ten veutraliy. Antenna i. with a dorsal bristle carrying very minute liairs. 

 Antenna ii. with two central bristles, the longer nearly twice the length of the shorter, 

 and with short stout liairs ; the shorter with fine hairs. 



If it be not dorsutuherculata, the specimen probably belongs to au undcscribed species. 



CONCHOECIA C. 



(Plate 25. figs. 258-262.) 



A single male with secondary sexual characters, I'l mm. long, occurred in haul 35 I 

 (500-100 fathoms). A comparison of the figures given here with Miiller's figures of 

 haddoni, iiwlsa, orthotrichota, &c. (pis. 18, 19) will show that the specimen is obviously 

 referal)le to his hlspinosa group. The shells had been slightly damaged, but I saw no 

 trace of a postero-dorsal spine ; the angle had, however, somewhat suffered. 



It may possibly prove to be a small specimen of the penultimate stage of haddoni, but 

 the size and the supposed contour of the postero-dorsal angle are against tins. In addition 

 to the features figured, may be mentioned that the armature of the principal bristle of 

 antenna i. (which I failed to get into profile position lor drawing) much resembled that 

 of incisa (Midler, xix. 7), and consisted of about 18 pairs of fine close-set teeth, markedly 

 directed backwards; there were two central bristles on antenna ii., the one about 

 two-thirds the length of the other. 



Halocypris globosa, Claus. 

 (Plates 25, 26. tigs. 263-278.) 

 Stage I. 



Male (2'1 mm.) *.— Shell with the height about f (65 p. c.) of tlie length; the two 

 shells together, viewed from a longitudinal vertical plane, are not subspherical as in the 

 female, but are hardly thicker from right to left than in an ordinary Conchoecia. 

 nostrum well developed, forwardly directed, placed at the end of the dorsal border, not 

 far down the anterior border as in the female. Shoulder-ridge inconspicuous, postero- 

 dorsal angle rounded, posterior border a steady curve with the opening of the right 

 asymmetrical gland about the middle of the height, no postero-vcntral angle. The 

 ventral border flatter than in the female. Frontal organ short, straight, segmented; 

 without hairs or spines; the terminal joint forms a slight angle with the thicker stem, 

 and is thinnest about the middle of its length. Antenna i. of female type, with four 



* Mullor's siuglc spocimcn was 2-2.5 mm. ; the spccitncus were probably at the oldest stage, if Ealocijiiris follows 

 the proportions usual in ConcJicecia. 



