33 ± BISCAYAN PLANKTON : THE OSTRACODA. 



Plate 26. 



Halocypkis globosa, Claus. 



Male. Stage I. Fig. 264'. Frontal organ and antenna i. 



265. Frontal organ. 



266. Hook of right antenna ii. 



267. Inner branch of left antenna ii. 

 Female. . 268. Shell, 2-7 mm. 



269. Frontal organ, and part of antenna i., 2"5 mm. 



270. Frontal organ, 2'5 mm. 

 Stage II. 271. Shell, 1-6 mm. 



272. Inner branch of antenna ii., 1"7 mm. 

 Stage III. 273. Shell, 09 mm. 



Stage IV. 274. Shell, 0-6 mm. 



27"). Left shell, from the ventral border, O'C mm. 



276. Frontal organ, and part of antenna i., 0'6 mm. 



277. Inner branch of antenna i., 0"6 mm. 

 Stage V. 278. Shell, 0--i ram. 



Cypkidina castanea, Brady. 



? Female. Stage IV. Fig. 279. Shell, 1-8 mm. 



280. Shell, from inside, to sliow the deeply ventral position of the rostrum. 



281. The rostral region. 



GiGANTOCYPius PELLUciDA, MuUer. 



Fig, 282. Embryo of 21 mm. in length, showing five pairs of appendages. 

 The edges of the shell have grown n\arkedly downwards in the 

 anterior part {sh). 



I 



