36 The Philippine Journal of Science 1921 
In the large specimen referred to above, the mouth-arm disk 
is approximately 150 millimeters in diameter, the subgenital 
ostia have a maximum aperture of about 180 millimeters, and 
the mouth-arm pillars show a minimum diameter (at the center 
of the subgenital ostia) of about 65 millimeters. The mouth 
arms are about 340 millimeters long, the undivided portion being 
about 280 millimeters long. The fleshy, unbranched portion is 
about 60 millimeters broad and 17 millimeters thick. The 
mouth-arm club is distinctly pedunculated, more than 150 milli- 
meters in length (all are imperfect) and about 12 millimeters 
in diameter. The proximal half of its central canal is a mottled 
brownish purple, the distal half of the purple color characteristic 
of the mouth-arm canals of the species. 
The canal system consists of 16 broad, radial canals : 8 ocular 
canals which run to the margin and bifurcate at the base of the 
sense organ (see fig. 1), and 8 interocular. The interocular 
canals end at the ring canal, which is very broad and distinct 
and is connected externally to the canal network of the margin 
by several small branches in each octant (7 in the specimen 
figured), and gives off internally between each 2 radial canals 
(that is, 2 in each octant) a single, broad and very short, blind 
diverticulum. The interocular canals are considerably larger 
than the ocular canals which are narrowed, proximally. 
The muscles are poorly developed, not being visible externally. 
I have named this strikingly beautiful medusa after Prof. 
W. R. Shaw, of the department of botany, University of the 
Philippines, who collected the first perfect specimen (figured 
here) and whose untiring interest in collecting specimens from 
Pasay beach is responsible for much of the data in this paper. 
While this paper was with the printer, Mr. Hilario A. Roxas, 
assistant in the department of zoology, collected the splendid 
specimen referred to above. 
Genus COTYLORHIZOIDES novum 
Generic diagnosis. — Rhizostomata dichotoma with 8 simple 
bifurcated mouth arms, the terminal branches of which branch 
pinnately. Subgenital porticus unitary, 8 marginal sense organs 
with or without ocelli and exumbrellar sensory pits, 8 large rho- 
palar canals and many small, anastomosing, interocular canals. 
No radial muscles. Strong circular muscles interrupted in the 
8 principal radii. Circular canal small or absent. Bell high 
and dome-shaped, without a central dome-shaped region as in 
Cotylorhiza. 
