178 BULLETIN OF THE 



Fig. 3. Upper part of tlie bell of T. cpiscopalis. This figure shows one of the four 



continuations of the bell cavity into the apical prolongation of the walls 



of the bell. 

 Fi" . 4. Optical section of the ovaries and bell margin of T. cpiscopalis. The origin 



of two long tentacles and the three intermediate papilla is shown on the 



lower side. 

 Fi». 5. The tentacular hulh oi T. cpiscopalis. The figure shows the relative position 



of the ocellus. 

 Fif^. 6. Undeveloped tentacular papilla of T. cjnscopalis. 

 YW, 7. Tentacular bulb and ocellus of Mocker ia multitcntacula (lower side). 

 Fit'. 8. Modeeria inultitentacula. 

 Fig. 9. Optical section (from aboral side) of the same. 

 Fig. 10. Tentacular bulb of M. multitcntacula (right side). 

 Fig. 11. Ocellus and base of a tentacle of Sarsia mirahilis. 

 Fig. 12. Cells and pigment spots of the spherical base of the tentacle of S. mirabilis. 



PLATE IV. 

 Fig. 1. Ounitia discoides. 



a. Sub-umbrella. 



b. Otocyst. 

 V, Veil. 



Fig. 2. View of C. discoides from oral side. One tentacle and one otocyst rep- 

 resented. 

 Fig. 3. Dinematclla carosum (adult). 



c. Cavity in the apical prolongation of the bell. 

 Fig. 4. YoMVLg Turritopsisnutricola {oraWiey;). 



Fig. 5. Dipurena strangulata (adult). 



Fig. 6. Pedunculated structure found on the adult oral lappets of T. nutricola. 



Fig. 7. Young T. nutricola (side view of Fig. 4). 



Fig. 8. Oral appendages of T. nutricola. 



Fig. 9. Stage in development of T. nutricola between Figs. 7 and 10. 



Fig. 10. Turritopsis nutricola (adult). 



PLATE V. 



Fig. 1. Euf ima fjracilis (adnlt). 



Fig. 2. Two rudimentary tentacles (?) with cirri, and a single ocellus, of E. gracilis. 



Fig. 3. Tentacular knob of ^. (/roci/is (adult). 



Fig. 4. Mouth of E. gracilis (adult). 



Fig. 5. Young of Zygodactyla grocnlandica. 



Fig. 6. Side view of the .same. 



Fig. 7. Euchcilota vcntricularis (young). 



Fig. 8. E. vcntricularis (oral view). 



Fig. 9. llvM oi E. vcntricularis {».fh\\t). 



Fig. 10. Quadrant of E. vcntricularis (oral view). 



Fig. 11. Single undeveloped tentacle oi Zygodactyla grocnlandica. 

 c, e. Green bodies. 



