38 The Philippine Journal of Science 1921 
The floor of the stomach is reenforced by four perradial thick- 
enings corresponding to the walls separating the subgenital 
portici in forms such as Cotylorhiza. 
Besides the numerous, small, pedunculated, knobbed appen- 
dages, the mouth arms bear large, rather stiff clubs which break 
off on lifting the medusae from the water. The club at the 
distal end of each mouth arm is very long and of a solid con- 
sistency. Proximally it is transparent and spindle-shaped, 
narrowing distally before it expands to form a three-sided, dart- 
shaped region, which is frosted white proximally and grayish 
green distally and contains very powerful nematocysts, able to 
pierce the skin of the palm of the hand. They evidently con- 
tain no poison, however, as they cause no itching or burning 
sensation. These clubs contain anastomosing canals like those 
of Mastigias. 
The mouth arms are short, fleshy, and thick and show window- 
like openings in the lateral membranes like those of Mayer’s 
Cotylorhiza pacifica (placed here in Cotylorhizoides) and Lobo- 
nema. The mouth arms of a specimen measuring 200 milli- 
meters in diameter (in preservation) were 80 millimeters in 
length, the upper arm being 20 millimeters long. 
This very large and striking medusa is common in Manila 
Bay at apparently irregular intervals. The specimens upon 
which this description is based were collected by Doctor Shaw in 
May of 1918. I found them common among the more numerous 
Lobonemse at that time. They appear to be very sluggish, their 
sting is negligible, and, having no long, flexible, nematocyst- 
armed appendages (like the tentacles of Chiropsalmus, the 
tentacles and oral lobes of Dactylometra, and the filainents of 
Lobenema ) and being very conspicuous, they are seldom, if ever, 
a source of annoyance to fishermen or bathers. 
Mayer’s description of Cotylorhiza pacifica was made from a 
single mutilated specimen. While the forms here placed in 
that species differ from the description of C. pacifica in certain 
points, most strikingly in the presence of exumbrellar sensory 
pits and ring canal, I am inclined to attribute these differences 
to the poor condition of Mayer’s specimen. A reexamination of 
the type in the light of our present knowledge would probably 
show it to be in agreement with the above description. If not, 
the form described here must be considered as a new species, for 
which I propose the name Cotylorhizoides punctatus because of 
the striking porcelain-white spots which characterize this form. 
I was at first inclined to consider this a new species until a 
reexamination of the type of C. pacifica showed otherwise; but 
