PLATE IX. 



All the figures represent the calyx and upper stalk joints of 

 Pentacrinoid larvæ of Hathrometra prolixa (Sladen) in different stages 

 of development. 



Fig. 1. Stage I. ^^''/i. 



— 2. Stage II. The oralia are open and the oral tentacles 



protruding, ''"/i. 



— 3. Stage III. "-'/i. 



— 4. Stage IV. '-'/i. 



— 5. Stage V. 'O/i. 



