18, 1 Light: Philippine Scyphomedusan Jellyfishes 43 
at frequent intervals but in small numbers. Two specimens col- 
lected by Doctor Shaw at Pasay beach in June, 1918, agreed with 
my description (1914). 
Genus LOBONEMA Mayer, 1910 
Lobonema mayeri Light. 
Lobonema mayeri LIGHT, Philip. Journ. Sci. § D 9 (1914) 217, figs. 7-9. 
This specific name was given in 1914 to a medusa common in 
Malampaya Sound, Palawan, in May, 1913, which differed in 
several important points from L. smithii as described by Mayer 
from Manila Bay in 1910. These differences combined with the 
different habitat seemed to make it certain that the two were 
distinctly different regional species, although I had not had the 
opportunity of examining specimens of Lobonema from Manila 
Bay. 
On examining Lobonema from Manila Bay in 1918 I was 
greatly surprised to find that it agreed in all important details 
with my description of L. mayeri rather than with Mayer’s L. 
smithii as I had expected. 
The question at once arises, Are these the same species or 
separate ones? Unfortunately, this question cannot be answered 
until after a careful reéxamination of the type and comparison 
with specimens of Lobonema mayeri, and perhaps not definitely 
then. 
I am inclined to believe, however, that the characters which 
seemed to mark Lobonema smithii as distinctly different from L. 
mayeri were due to a great extent to the condition of the material 
from which the diagnosis was made. Mayer’s description was 
based on a “quadrant” of a perfect specimen, and two imperfect 
specimens. The chief outstanding difference between the two 
species was that L. smithii had but 8 sense organs while L: mayeri 
has from 12 to 16, usually about 14. This may be accounted for 
by Mayer’s “quadrant” having been less than one-fourth of the 
entire medusa and also by its having been that part of the bell 
in which the sense organs were least numerous, for the distribu- 
tion of sense organs is often unsymmetrical. In a number of 
specimens I have seen two sense organs nearly side by side, 
giving the appearance of having arisen by fission. This dif- 
ference in the number of sense organs could not be due to the 
immaturity of Mayer’s specimens since several specimens less 
than half as large as his showed 14 sense organs. While, there- 
fore, I believe that Lobonema smithii and L. mayeri are prob- 
ably the same species, or at most varieties, I have no scientific 
