328 



BISCATAN PLANKTON : THE OSTEACODA. 



Plate 23. 



Male. 

 Female. 



CoNCHCECiA PusiLLA, var. MAJOR, IMiillcr. 



Fig. 185. Inner joint of antenna ii., 0'7 mm. 



18/. Postero-dorsal angle of shells^ from inside, 0"8 mm. 



CoNCHCECiA RHYNCHENA, Miiller. 



Male. Stage II. Fig. 188. Shell, 2-5 mm. 



Sta-e III. 



Stage IV. 



Female. Stage II. 



Stage III. 



Stage IV. 



Stage V. 



189. Pad on proximal accessory bristle of antenna i., 2*5 mm. 



190. Shell, 1-7 mm. 



191. Frontal organ, and part of antenna i., 1"7 mm. 



192. Shell, 1-1 mm. 



193. Frontal organ, and end of antenna i., 1"1 mm. 



194. Part of antenna ii., I'l mm. 



195. Shell, 2-5 mm. 



196. Frontal organ, with unusually blunt end, 2'^> mm. 



197. Frontal organ, with imnsually sharp end, and end of 



antenna i., 2'5 mm. 



198. Frontal organ witli prolonged tip, 2'4. 



199. Shell, 1-6 mm. 



200. Frontal organ, and end of antenna i. (dorsal bristle accidentally 



omitted), 1"G mm. 



201. Shell, 1-1 mm. 



202. Frontal organ, and end of antenna i., I'l mm. 



203. Shell, 0-8 mm. 



204. Frontal organ, and end of antenna i., 0"8 mm. 



Male. 



Stage 



Stage II. 



Stage III. 



I. Fi£ 



Stage IV. 

 Female. Stage I. 



Stage II. 

 Stage III. 

 Stage IV. 



CoNCHCECiA ROTUNDATA, Miiller. 



206. Inner branch of light antenna ii., 0*9 mm. 



208. Frontal organ, and part of antenna i., 0"7 mm. 



209. Inner branch of right antenna ii., 0'7 mm. 



210. Inner branch of left antenna ii., 0*8 mm. 

 212. Frontal organ, and part of antenna i., 0"6 mm. 

 214. Frontal organ, and part of antenna i., 0*4 mm. 



216. Frontal organ, typical form, 1"2 mm. 



217. The same, unusual form, resembling that o{ pusil/a, 09 mm. 



218. Inner branch of antenna ii., 1*2 mm. 



220. Frontal organ, and part of antenna i., 08 mm. 

 222. Frontal organ, and part of antenna i., 0'5 mm. 

 224. Frontal organ, and part of antenna i., 0'3 mm. 



