1873.] 



177 



[McCrady. 



the fibres found in the previous examples. These were more partic- 

 ularly examined and proved to be nodose branching tubes, recalling 

 forcibly tfie branching stems of Hydroids, being occupied like them 

 by a fleshy parenchyma enclosing a canal, d (except in young 

 branches, like fig. 8, e), and expanding at irregular intervals into 



Fig. 2. 



1-8, stages in the development of Bucephalus euculus. 7, extremity of tentacu- 

 lum. 8, sporocyst. a, apparent cavity, b, opake nucleus, c, already formed 

 worm with tentacula t. d, central canal, e, young branch without canal. 



PROCEEDINGS B. S. N. H. — VOL. XVI. 12 MARCH, 1874. 



