188 Papers from the Department of Marine Biology. 
Light finds that Mayer is mistaken respecting the habits of this medusa and 
that it is not a bottom form, but swims in shallow water near the surface. 
Seven specimens found in Manila Bay on December 9, 1907, are in the 
collection made by the United States Fisheries Bureau steamer Albatross, and 
a larger one found on March 11, 1908. This largest specimen serves as the 
type of the species in the National Museum at Washington. Its dimensions 
in millimeters are as follows: Bell 115 wide, evenly rounded, 35 high; arm- 
disk 75 wide where it arises from the subumbrella, 52 wide at level of origin 
of mouth-arms; mouth-arms 58 long, upper arm 7 long, lower arm 51 long 
and 30 wide. 
Another specimen of medium size, nearly mature, was found at Cavite 
Anchorage, Manila Bay, Luzon, on July 2, 1909. 
Light (1914) states that this is the commonest medusa in Manila Bay in 
November and December. 
Catostylus townsendi, sp. noy. 
This species is named in honor of the author’s friend Dr. Charles H. Town- 
send, the distinguished Director of the New York Aquarium. 
Six specimens were found at Station D 5594, September 30, 1909, about 6 
miles off Mount Putri, Borneo, in 11 fathoms. This medusa is closely allied 
to Catostylus purpurus of Manila Bay, Philippine Islands, but in formalin its 
exumbrella is milky in color and bespeckled irregularly with numerous con- 
spicuous purple-brown spots. The mouth-arms are more pointed than in 
C. purpurus. Insome octants of the bell-margin the velar lappets are arranged 
as in C. purpurus, but they are usually more numerous and more irregularly 
arranged than in C. purpurus. 
The dimensions of the largest specimen of C. townsendi, stated in millimeters, 
are as follows: Bell 97 wide, flatter than a hemisphere, exumbrella finely 
granular, gelatinous substance of a horny rigidity. Shape and consistency of 
the bell as in C. purpurus. 8 rhopalia without ocelli, in formalin, and with a 
deep dark-colored, furrowed, exumbrella pit. 
The rhopalar lappets are small and oval, but the velar lappets are about 
twice as wide aslong. Deep clefts between the lappets extend a short distance 
up the sides of the exumbrella. The velar lappets are very irregular in 
arrangement, although they tend to conform to that seen in C. purpurus of 
Manila Bay, Luzon, yet in most of the octants the subdivisions of the principal 
lappets are more pronounced and irregular than in C. purpurus, so that there 
are usually 7 or 8 main velar lappets with 10 to 14 marginal lobes in each octant. 
The arm-disk is similar in shape to that of C. purpurus. It is 61 mm. in 
perradial and 45 mm. in interradial diameter. The perradial columns are 
17 mm. and the subgenital ostia 20 mm. wide. The projections and papille 
of the subgenital ostia are similar to those of C. purpurus. The subgenital 
cavity is unitary. 
The 8 mouth-arms are each about 64 mm. long, the upper, naked outer part 
of each arm being 14 mm. and the 3-winged lower part 50 mm. long. The 
arms are widest at the proximal parts of the 3-winged expansions which, when 
spread out, are about 31 wide. They taper to pointed distal ends and have 
no appendages among the mouth-frills. 
There is a powerful unbroken zone of circular muscles in the subumbrella, 
27 mm. wide, from the outer edge of the arm-disk to the bell-margin. There 
are also radial-muscle fibers on the abaxial sides of the 4 perradial columns of 
the arm disk, as in C. purpurus. 
16 radial-canals arise from the cruciform central stomach. The 8 rhopalar- 
canals extend straight to the rhopalia but the 8 adradial-canals end in the 
