326 



BISCAYAN PLAjN'KTON : THE OSTEACODA. 



Plate 22. 



CONCHCECIA MAGNA, ClaUS. 



Male. Stage II. Fig. 145. Frontal organ, 1"8 mm. 



146. Armature from about the middle of tiie toothed part of the principal 



bristle of antenna i., 1"8 mm. 



147. Hook of antenna ii., right side, 1"8 mm. 



1 48. Central bristles of the inner branch of antenna ii., the hairs foreshortened 



on one side. 

 Stage III. 150. Frontal organ, usual form^ with sharp terminal spike, 1"3 mm. 



Female. Stage I. 152. Part of dorsal bristle of antenna i., 3"4 mm. 



153. Central bristles of inner branch of antenna ii., 3' 4 mm. 

 Stage II. 155. Frontal organ and end of antenna i., the bristles and tubes cut short. 



The dorsal bristle accidentally omitted, I'd mm. 



156. Part of the dorsal bristle of antenna i., 2"1 mm. 



157. Central bristles of the inner branch of antenna ii. The shorter does 



not always show hairs, 2 1 mm. 

 Stage III. 150. Frontal organ of usual form, and antenna i. carrying a hairless, very 



fine dorsal bristle, 1*2 mm. 

 160. Central bristles of inner branch of antenna ii., 1'3 mm. 



The a liARVJE. 



Male. Stage IV. Fig. 162. Frontal organ, and part of antenna i., ()'9 mm. 



163. Central bristles of antenna ii., 0"9 mm. 

 Female. Stage IV. 165. Frontal organ, O'B mm. 



Male. Stage V. 167. Frontal organ, and part of antenna i., 0"5 mm. 



168. Central bristle of antenna ii., 0'5 mm. 



Male. 



Female. 



Stage IV. 



Stage 



V. 



CoNCHCECiA PRocERA, Muller. 



Fig. 169. Shell, 1-1 mm. 



170. Shell, O-y mm. 



171. Frontal organ, 0"9 mm. 



172. Inner branch of antenna ii., 0'9 mm. 



173. Shell, 0-6 mm. 



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



175. Shell, 1-2 mm. 



176. Frontal organ, somewhat like that oi lirachyaskos, 1*2 mm. 



177. Shell, 0-9 mm. 



178. Frontal organ, and part of antenna i., 0"9 mm. 



179. Shell, 0-7 mm. 



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



181. Inner brunch of antenna ii., 0'7 mm. 



182. Shell, 0-5 mm. 



183. Frontal orsjan. 0*5 mm. 



CoNcncEciA PusiLLA, var. jiAJoK, Miiller. 



:\lale. 

 Female. 



Fig. 184. Shell, 0-8 nnu. 

 180. Shell, 0-8 ram. 



