96 MARGARET 0. COLLOUTT. 



3. Eudoderm of the Blastostyle. — The cndoderni 

 lining the cavity of the blastostyle is mostly richly ciliated 

 with very long cilia ; the cells of the " head " are large^ and 

 each contains a nucleus like that in the endoderm cells of the 

 rest of the colony; these cells digest food material, apparently 

 becoming amoeboid at their free ends (PI. !_, fig. 6), the blasto- 

 styles undoubtedly taking in nutritive material by their 

 mouths. 



The cells of the '' neck " are very long, regular, and narrow, 

 and there are numerous small nuclei, each containing several 

 distinct nucleoli in this region, which is richly ciliated ; egg- 

 cells are here present in abundance (PI. 1, fig. 6). 



Below this region the body of the blastostyle dilates, and 

 sporosacs arise; the cells here are smaller, have large nuclei, 

 and cilia are not so apparent. Gland-cells are nowhere 

 present in the endoderm of blastostyles. The tentacles have 

 a solid endodermal core as in the gasterozooids. Egg-cells 

 have been observed in the endoderm of the base of the blasto- 

 style. 



4. Endoderm of the Dactylozooid. — This endoderm is 

 very vacuolated ; the cells are approximately equal in size, but 

 are rather smaller towards the distal extremity of the polyp. 

 The nuclei are situated in the middle of the cells. The endo- 

 derm of the upper half of the body is often crowded with food 

 granules, but I have never observed food masses in the lumen 

 of the endodermal gut, nor are gland cells present. 



5. Endoderm of the Tentacular Polyps. — This endo- 

 derm is also crowded with food granules throughout its extent. 

 The cells are very regular, long, and narrow, and the lumen 

 of the gut widens considerably towards the base of the polyp. 



