PLATE 17. 



Fig. I. Bou%ainvillia supt-rciliaris. Showing planulae developing upon the 

 interradial sides of the manubrium. Woods Hole, Massachu- 

 setts. 



Fig. 2. Bougainvillia nigosa, young medusa. Charleston Harbor, South 

 Carolina, December 17, 1904. 



Fig. 3. Bougainvillia tuitiiinnalis, young medusa. Agassiz Laboratory, 

 Newport, Rhode Island, July, 1902. 



Fig. 4. Bougainvillia autumnalis, mature female. Agassiz Laboratory, 

 Newport, Rhode Island, August, 1892. 



Fig. 5. Nemopsis bachei. One of the median marginal tentacles of the 

 medusa shown in figure 6. 



Fig. 6. 'Nemopsis baflici, mature male. Hampton Roads, Virginia, 

 November I, 1904. 



Fig. 7. Bougainvillia carolinensis, mature male. Charleston Harbor, 

 South Carolina, September 10, 1897. 



Fig. 8. Bougainvillia britannica, mature female. Eastport, Maine, Sep- 

 tember 19, 1898. 



Drawn from life, by the author. 



