stage with the oesophagus reduced to four tubes and with three 

 osGula and an oral vesicle on each arm, which it has in cornnon 

 with Pilerna and Cotylorhiza. 



A somewhat cursory examination of my material made to de- 

 termine the mode of development of the oral funnels and vesi- 

 cles, inclines me to the views on this point upheld by Glaus, 

 rather than to those of Hamann. 



A s^^/Tiopsis of the principal characters of the adult medu- 

 sa is given in the diagnosis of the species and the following 

 section. l^lTiat most strikes a casual observer, is the peculiar 

 concave exumbrella and the animal's m^ode of life. The only 

 other species that has been described as naving a similar shape 

 is Gassiopea pol^^^oides . Keller, but I have observed that Poly - 

 c Ionia frondosa also approaches this conaition. The habit of 

 living in schools in shallow water and resting; on the bottom 

 with the mouth upwards has been noticed by a mmber of persons 

 in other species of Gassiopea and in Polyclonia and seems to be 

 common in these two genera. 



- 67 - 



