18, 1 Light: Philippine Scyphomedusan Jellyfishes 41 
canal, and its circular muscles than to Cotylorhiza and the other 
genera of the Rhizostomata dichotoma. 
Much more so is this true in the case of Anomalorhiza. Here 
even the branching of the mouth arms is difficult to homologize 
with the other Rhizostomata dichotoma, since they branch di- 
chotomously only near the tip, and the axial canal is continued 
downward into the terminal club. Here also there are no other 
characters to place it with this group. On'the other hand, how- 
ever, it is equally hard to place it among the Rhizostomata trip- 
tera on the basis of its mouth arms. Indeed, it is because of this 
anomalous condition of the arms that I have given it the generic 
name Anomalorhiza. 
Rhizostomata triptera Vanhoffen, sensu Maas, 1903 
Genus CATOSTYLUS L. Agassiz, 1862 
Catostylus purpurus Mayer. 
Catostylus purpurus MAYER, Medusae of the World 3 (1910) 671, 
fig. 412; LigHT, Philip. Journ. Sci. § D 9 (1914) 207; MAYER, Pub. 
Carnegie Inst. Washington 212 (1915) 187. 
This is the commonest jellyfish of Manila Bay. Its bell, vary- 
ing in color from deep brown to black through purple, is to be 
seen at practically all seasons of the year dotting the shallower 
waters of the bay and its tidal streams and creeks (esteros). 
In a former note? I spoke of this medusa as not being capable 
of administering a sting of any severity. Statements on the 
part of bathers that the sting was severe when the mouth arms 
of the medusze came into firm contact with the body led me 
to experiment on myself. I rubbed the mouth arms of a large 
specimen across the back of my wrist. There was no immediate 
severe stinging sensation as is the case with Lobonema, but it 
was more intense and of longer duration. I quote from my 
notes: “The area soon became very red and hot with a pronoun¢éed 
stinging and burning sensation. This was relieved somewhat 
by application of ammonia but much more so.by powdered sodium 
bicarbonate. The relief was only temporary and numerous ap- 
plications were necessary. Although the burning sensation 
passed away after a few hours the area was still sore some 
twelve hours later. About three hours after the sting the bones 
and joints began to ache as in dengue fever, and this was accom- 
panied by a dull but persistent ache over the kidneys and a dull 
headache. After taking 10 grains of aspirin the symptoms were 
much alleviated.” 
* Philip. Journ. Sci. § B 3 (1908) 329. 
