316 



BISCATAN PLANKTON : THE OSTEACODA. 



Male. Staff e I. 



Stage II. 



Earlier stages. 



Female. Stage I. 



Stage II. 



Earlier stages. 



Plate 17. 



CoNCHCECiA cuRTA, Lubbock. 



Fig. 30. Shell, 102 mm. [stigmatica stage). 



31. Frontal organ, 10 mm. 



33. Armature of principal bristle of antenna i., I'O mm. 



33. Inner joint of right antenna ii. (one basal and one central bristle are 



obscured by their fellows), 10 mm. 



34. Hook of left antenna ii., TO mm. 



35. Shell, 0-82 mm. {curta stage). 



36. Frontal organ, and part of antenna i., 075 mm. 



37. Inner joint of right antenna ii., 08 mm. 



38. Hook of left antenna ii., 08 mm. 



39. Shell, 082 mm. (before acquirement of secondary sexual characters). 



40. Shell, 0-59 mm. 



41. Frontal organ, and part of antenna i., 059 mm. 



42. Inner branch of antenna ii., 059 mm. 



43. Shell, I'Ol mm. [stigmatica stage). 



44. Frontal organ, and part of antenna i., 101 mm. 



45. Frontal organ, I'Ol mm. 

 4(). Frontal organ, 101 mm. 



47. Distal sense-tube of antenna ii., I'Ol mm. 



48. Shell, 0'80 mm. [curta stage). 



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



50. Shell, 0-59 mm. 



51. Frontal organ, and part of antenna i., 0'59 mm. 



52. Frontal organ, and part of antenna i., 0"57 mm. 



53. Shell, 0-45 mm. 



54. Shell, 0-39 mm. 



Male. Stage 1. 

 Female. Stage III. 



CoNCHCECIA DAPHNOIDES, ClaUS. 



Fig. 55. Shell, 23 mm. 



56. Shell, 1'2 mm. 



57. Frontal organ, and part of antenna i., 1-2 mm. 



Male. Stage. II. 

 Female. Stage HI. 



CONCHOJCIA ELEGANS, SarS. 



Fig. 63. Postero-dorsal angles of the shell from inside. 

 71. The same. 



