318 BISCAYAN PLANKTON: THE OSTEACODA 



Plate 18. 



CoNCHCECIA ELEGANS, Sars. 



Male. Stage II. Fig. 58. Shell, 1-1 mm. 



59. Frontal orgaUj Tl mm. 

 Stage III. 60. Shell, 09 mm. 



61. Frontal organ, and antenna i., 9 mm. 



62. Frontal organ, 09 mm. 

 Stage IV. 64. Shell, 06 mm. 



Female. Stage II. 65. Shell, M mm. 



66. Inner branch of antenna ii., 11 mm. 

 Stage III. 67. Shell, 0-9 mm. 



68. F^rontal organ, and end of antenna i., 0'8 mm. 



69. Frontal organ, 0'8 mm. 

 Stage IV. 70. Shell, 0-6 mm. 



Stage V. 72. Shell, 0-4 mm. 



CoNCHfficiA iiADDONi, Brady and Norman. 



Male. Stage I. Fig. 73. Shell, 2-1 mm. 

 Stage III. 75. Shell, 1-0 mm. 



