216 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



from C. mosaicus in having only 10 marginal lappets in each octant 

 instead of about 16, as in G. mosaicus. Moreover, in G. mosaicus the 

 lappets are all long, pointed, and similar in size and shape each to 

 each, whereas in the Philippine medusa there are eight long, pointed 

 velar and two much shorter, oval, occular lappets in each octant. 

 The Philippine medusa is, however, quite small, being only 86 mm. 

 in diameter, whereas C. mosaicus becomes fully 350 mm. wide. These 

 differences may therefore be due to immaturity. In the Philippine 

 medusa the bell is 86 mm. wide, mouth arms 63 mm. long, the upper 

 arms being 11 mm. and the lower 52 mm. The interradial subgenital 

 ostia are 18 mm. wide, with a large oval or nearly spherical papilla 

 on the subumbrella. The perradial columns of the arm disk are only 

 12 mm. wide, thus the ostia are 1.5 times as wide as the columns. 

 The perradial diameter of the arm disk is 52 mm. and its interradial 

 diameter 44 mm. The powerful ring muscles of the subumbrella are 

 only partially interrupted in the eight chief radii. The exumbrella 

 is coarsely granular and besprinkled thickly with numerous minute 

 cinnamon-brown flecks. Other parts of the medusa are pale milky 

 pink. The gelatinous substance is tough and rigid. 



If this be not G. mosaicus it is certainly very closely related to 

 this well-known Australian medusa. G. mosaicus is abundant in 

 bays and estuaries along the Australian coast from Melbourne to 

 the mouth of the Brisbane River in Queensland. 



In Sydney Harbor all specimens of this medusa are dull creamy 

 brown or yellowish in color, but in Moreton Bay, Queensland, most 

 of them are cobalt blue. It is interesting to see that H. B. Bigelow x 

 finds that Stomolophus meleagris in San Diego Bay, California, is 

 Prussian blue instead of being dull yellow, as in the Atlantic. 



Catostylus mosaicus appears to breed throughout the year in 

 Moreton Bay, Queensland, but in the temperate regions of Australia 

 it is said to become mature only in summer and autumn. 



Genus LYCHNORHIZA Haeckel, 1880. 



Lychnorkiza+Cramborhisa Haeckel, 1880, Syst. der Medusen, pp. 587, 

 633.— Mayer, 1910, Medusae of the World, vol. 3, p. 672. 



Generic Characters. — Rhizostomata triptera with filaments, but 

 without clubs, upon the 3-winged mouth-arms. No axial terminal 

 club at end of each arm, and no club-shaped appendages between the 

 mouths. The stomach gives rise to 16 radial-canals — 8 rhopalar and 

 8 adradial. The rhopalar-canals extend to the bell-margin, but the 

 adradial ones end in the ring-canal. Blindly ending, centripetal 

 vessels arise from the inner side of the ring-canal and may anasto- 

 mose to some extent. On its outer side the ring-canal gives off a net- 

 work of anastomosing vessels which extend into the lappets. 



1 1914, University of California Publications in Zoology, vol. 13, p. 239. 



