MUSEUM OF COMPARATIVE ZOOLOGY. 289 



Fig. 1. Glossocodon tcnuirostris. 



" 2. Larva of the same (fourth period, Haeckel). 



" 3. The same more developed (fifth period, Haeckel). 



" 4. Larva in fifth period. 



" 5. Larva in sixth period. 



" 6. Same, more developed. 



" 7. Fig. 1 from aboral pole. 



" 8. Base of the adult tentacle. 



" 9. Everted stomach walls and protruded gastrostyle. 



" 10. Aglaura vitrca. 



" 11. Eucharis multicornis (one half body of the young). 



" 12. Sameatrightanglestofig.il. 



" 13. Tiaropsis diademata (young). 



" 14. Quadrant of the same (oral view). 



" 15. Halicalyz tenuis (only four of the twelve marginal tentacles are drawn). 



" 16. Stauropkora laciniata. 



" 17. Tentacular knobs and " spur " of the same. 



a. Embryonic tentacles from bell walls. 



b. Ribs connecting the embryonic tentacles with the bell rim. 



c. Club-shaped tentacular bodies, 

 e. Tentacular spur. 



/. Auricle. 



Cambridge, April 1, 1882. 



