1908] Kofoid. — Exuviation and Autotomy in Ceratium. 371 



23 



22 



Figs. 21-23. — Ventral views of Ceratium biceps showing progressive and 

 proportionate reduction in the apical and left antapical by autotomy. X 100. 



Fig. 24. — Ventral view of Ceratitim biceps after autotomy of the apical 

 horn, showing two section planes, one of which is oblique, forming near the 

 base of the left antapical. X 100. 



