330 



BISCATAN PLANKTON: THE OSTEACODA. 



Male. 



Female. 



Plate 24. 



CoNCHCECIA UOTUNDATA, Mullei'. 



COXCHCECIA SPINIFERA, ClaUS. 



Male. Stage II. Fig. 225. Shell, 1-8 mm. 

 Stage III. 226. Shell, 1-4 mm. 



Stage IV. 



Female. Stage II. 



Stage III. 



Stao-e IV. 



227. Frontal organ, and part of antenna i., l''! mm. 



228. Shell, I'O mm. 



229. Frontal organ, and part of antenna i., TO mm. 



230. Shell, 2-2 mm. 



231. Inner branch of antenna ii., 2*2 mm. 



232. Shell, 1--J. mm. 



233. Frontal organ, and part of antenna i. 



234. Shell, 1-0 mm. 



235. Frontal organ, and part of antenna i., I'O mm. 



Male. 



Female. 



CoNCHCECIA SPINIROSTRIS, ClaUS. 



Stage I. Fig. 237. Frontal organ, 1-3 mm. 



Stage II. 



Stage II. 

 Stage III. 



238. A saw-tooth of the principal bristle of male antenna i. (freehand), 

 1'3 mm. 



240. Frontal organ, I'O mm. 



241. Inner branch of right antenna ii., TO mm. 



242. Inner branch of left antenna ii., TO mm. 

 244. Frontal organ, and part of antenna i., 1-2 mm. 

 246. Frontal organ, and part of antenna i., 0'8 mm. 



