322 



BISCAYAN PLANKTOX: THE OSTEACODi . 



Plate 20. 



CoNCHCECIA HYALOPHYLLUM, ClaUS. 



Fig. 97. Opening of left lateral gland, from inside, 1"5 mm. 

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



103. F'routal organ, and part of antenna i., 2*5 mm. 



104. Part of inner branch of antenna ii., 2'5 mm. 



106. F'rontal organ, 1-7 mm. 



107. Central l)ristles of inner branch of antenna ii., F7 mm. 

 Stage III. 109. Frontal organ, and end of antenna i., TO mm. 



Male. Stage 11. 



Stage III. 



Female. Stage I. 



Stage II. 



Male. Stage II. 



Stage III. 

 Stage IV. 



Female. Stage II. 



Stage III. 



Stage IV. 

 Stasre V. 



CoNCHCECiA iMBRicATA (Brady pars), Miiller. 



Fig. ] 10. Ilook and bristles of antenna ii., right side, 2"0 mm. 



111. Hook of left side, 3'0 mm. 



112. Shell, 1-5 mm. 



113. Shell, 1-0 mm. 



114. F^rontal organ, and end of antenna i., 1"0 mm. 



115. F'routal organ, and end of antenna i., 2'5 mm. 



116. Part of antenna ii., 2'5 mm. 



117. Shell, 1'5 mm. 



118. F'routal organ, and end of antenna i., 1"5 mm. 



119. Shell, 1-0 mm. 



120. Frontal organ, 10 mm. 



121. Shell, 0-6 mm. 



CoNCHCECIA INKR.MIS, ClauS. 



Male. Stage ? II. Fig. 122. Shell, 1-9 mm. 

 Stage ?III. 123. Shell, 1-5 mm. 



124. Frontal organ, and part of antenna i., 1'5 mm. 



125. The rostra, from inside, I'o mm. 

 Female. Stage ?II. 126. Right shell, from inside, 2'0 mm. 



Male. 



Female 



Stage 



Stage HI, 



Stage 1. 

 Sta"e III. 



CONCHCECIA LORICATA, ChuiS. 



I'ig. 128. I'rontal organ, 2'4 mna. 



129. Armature of antenna i., 2'4 mm. 



132. Frontal organ, 1'4 mm. 



133. Inner branch of antenna ii., 1"4 mm. 

 13.1. Inner branch of antenna i., 2'G mm. 



138. Frontal organ, and end of antenna i., 1'2 mm. 



