286 BULLETIN OF THE 



PLATE II. 



Fig. 1. Cassiopca frondosa (aboral view). 

 " 2. The same (oral view). 



" 3. Linergcs Mcrcurius (side view). The marginal lobes are infolded. 

 " 4. The same. The marginal lobes are extended and the crescentic form of 



the ovaries is shown. 

 " 5. L. Mcrcurius (aboral view). 



PLATE III. 



Fig. 1. Portion of the oral surface of C. frondosa. 

 " 2. Peripheral extremity of a canal lying in the central cavity between 



two ovaries. Showing also the opening (b) leading from it into the 



chymiferous system of the oral anus. 

 " 3. Oral cylinder cut off from the bell, so as to expose its cavity. 

 " 4, 5. Life-size figures of L. Mercurius in attitudes assumed while swimming. 

 " 6. Section cut through the cavity which lies above the stomach of L. M< r- 



curius. One half this sinus is drawn in longitudinal plane, i. e. 



section cut in the direction of the axis of the medusa. 

 " 7. View of the opening by which this cavity communicates with the 



stomach. 

 " 8. The same opening shown in an ephyra in order to illustrate its relations 



to the remaining structures of the same. 

 " 9. Cassiopea frondosa. 

 " 10. The same (position assumed in floating). 

 " 11. Ovary (shrunken) of L. Mcrcurius. 

 " 12. Portion of the inner bell wall of the same medusa. 

 " 13. L. Mercurius from oral side. 



a. Circular orifice, centrally placed, communicating between the 



stomach and the cavity situated above it. 

 h. Opening leading from the cavity of the oral cylinder into theohymif« 



eroru vessels of the anus. 

 c. Cavity above the stomach. 



