FIGURES 47-51 



Fig. 47. Typical mature Ceratocorys horrida Stein, from station 57. A, antapical 

 view; B, ventral view; C, apical view; D, left lateral view; E, right lateral view. Magnifi- 

 cation: X 340. 



Fig. 48. Daughter cells of Ceratocorys horrida Stein. A, B, C, D, apical, antapical, 

 left lateral, and ventral views, respectively, of left (two-spined) daughter cell with old left 

 moiety and new right moiety, from sample 192; E, F, G, apical, right lateral, and ventral 

 views, respectively, of right (four-spined) daughter cell with old right moiety and new left 

 moiety, from sample 335; H, left daughter cell with directly opposed spines, from sample 

 256; I, left daughter cell with rather dependent spines, from sample 284. Magnification: 

 X 230. 



Fig. 49. Ceratocorys horrida Stein. A, long-spined form from sample 278; B, thick- 

 walled, heavily sculptured form from sample 161; C, long-spined form with double dorsal and 

 ventral spines, from sample 272; D, short-spined form with dorsal spine absent, from sam- 

 ple 161; E, anterior view of sixth girdle plate showing the partitioning lists on the girdle; F, 

 short-spined form (hypotheca only) with double dorsal and ventral spines, from sample 240; 

 G, long-spined form, from sample 1; H, short-spined form showing autotomy of the spines; 

 three of the antapical spines have been cast off; the other spines are fracturing; I, J, K, cross 

 sections of bases of dorsal, right, and ventral spines, respectively. Magnification: x 230; 

 except B, x 340. 



Fig. 50. Thin-walled, spineless specimen of Ceratocorys horrida Stein from sample 

 284. A, ventral view; B, apical view; surface of pr2-pr4 not shown; C, right lateral view, 

 surface not shown. Magnification: x 340. 



Fig. 51. Frequency distribution of length of spine in C. horrida . 



114 



