Notes ou the Physiology of C'b.irybdea rastoiiii. 



preseiit a, tree-like appearance." His figure is here reproduced 

 (Fig. 4). In C. arhorifera of Maas, which is supposed to he the 

 same species as C. rastonii, the phacellae are said to he deiuh-itic, 

 all the tufts arising from a single stalk (Maas '97 PI. 14, Fig. <)). 

 The phacelhe of Japanese Charyhdea present an entirely diffei-ent 

 aspect from the altove description, especially when they are ex- 

 amined in living medusae. The filaments are clustered in four 

 groups on the iuterradial sides of octagonal gastral cavity. They 



number nine or ten in 

 each group and are dis- 

 posed at irregular intervals. 

 Each filament is composed 

 of a stalk and a terminal 

 tuft. Some stalks have a 

 side l)ranch, it is true. 

 I)ut the whole structure 

 can hardly l)e called den- 

 dritic (Fig. 5). The 

 phacella? show a slow 

 squirming movement, as 

 was observed by ï'ritz 

 ■ ' Müller ('58 p. 543) and 



also by Conant ('98 p. 14). 

 The filaments can best 

 Ite studied by holding a 

 medusa with food in its 

 stomach against the inner 

 side of a glass vessel and 

 by examining it with a 

 Fig. s. handlens from the outside. 



