PLATE 24. 



Fig. I. Orfhistoma tentaculata, young medusa. Agassiz Laboratory, New- 

 port, Rhode Island, August 18, 1896. 



Fig. 2. Mclifcrtissa clavigera Haeckel, Tortugas, Florida, June 2, 1906. 



Fig. 3. Mcliccrtissa clavigera Haeckel. One of the marginal sense-clubs of 

 the medusa shown in figure 2. 



Fig. 4. LnnJiffa cruciata var. ulothrtx. Part of the bell-margin of the medusa 

 shown in figure 2, plate 23. 



Fig. 5. Mfliccrtuin campanula, halt-grown medusa with the 4 secondary 

 radial-canals beginning to develop. Nahant, Massachusetts, 

 May 6, 1897. 



Drawn from life, bv the author. 



