MUSEUM OF COMPAEATIVE ZOOLOGY. 285 



EXPLANATION OF THE PLATES. 



PLATE L 



Fig. 1. Ocyroe crifstaUina {yonng). 



2. The same, with oral lobes expanded. 



3. A single oral lobe extended. 



4. Position assumed by the oral lobe. 



5. View of oral lobe from the aboral pole (expanded). 



6. The same contracted. 



7. Cassiopea frondosa in. natural position. 



8. Young of the same (aboral view). 

 9 a. Side view of young Cassiopca. 

 9 b. Older larva of the same. 



10. Cassiope.a frondosa (aboral view). 



IL The same (oral view). 



12. Marginal sense body of the same (aboral side). 



13. The same (oral side). 



14. Double marginal sense body of 0. frondosa (monstrosity). 



15. The same (aboral view). 



16. Marginal sense body with two ocelli (monstrosity). 



17. Extremity of the oral arms of Cassiopca. 



18. Mouths and pouches of the same. 



19. Oral appendage from upper side. 



a. Auricles. 



h. Bifurcation of the lateral tubes. 



c. Primary tubes from the base of the funnel, 

 c c. Secondary tubes, branches of the primary. 



d. Oral branches. 



e. Radial stripes. 



cK Intermediate spaces between the radial stripes. 



/. Marginal zone. 



h. Hood. 



i. Oral disk. 



'. Otocyst. 



k. Stomach. 



I. Lips, 



m. Mouth. 



0. External sexual opening. 



