HYDROMEDUSAE, SIPHONOPHORES, AND CTENOPHORES. 347 



Suborder RHIZOPHYSALIAE. 



Family PHYSALIIDAE Brandt, 1835. 



Genus PHYSALIA Lamark, 1801. 



PHYSALIA UTRICULUS (La Martiniere) Eschscholtz. 



Medusa vtriculus La Martinique, 1787, p. 365, pi. 2, figs. 13, 14. Syno- 

 nymy, Bigelow, 19116, p. 323. 



Locality.— Latitude 25° 10' N.; longitude 166° 20' W., between 

 Oahu and Midway Island; 3 specimens (Cat. No. 29411, U.S.N.M.), 

 with pneumatophore 22 to 30 mm. long. It is somewhat surprising 

 that during so long a cruise only three small specimens of a species 

 so common and generally distributed over the warmer parts of the 

 Indo-Pacific were collected. 



Suborder CHONDROPHORAE. 

 Family PORPITIDAE Brandt, 1835. 



Genus PORPITA, Lamark, 1801. 



PORPITA, species? 



Locality.— Latitude 25° 10' N.; longitude 166° 20' W., between Oahu 

 and Midway Island; 5 specimens (Cat. No. 32994, U.S.N.M., 4 speci- 

 mens; Cat. No. 1606, M.C.Z., 1 specimen), 7 to 10 mm. in diameter. 



These specimens are so young that I hesitate to identify them 

 specifically. From the standpoint of the zoogeophrapher an incor- 

 rect identification would be much worse than none, because the ques- 

 tion whether the Porpitas of Philippine, Malayan and Indian waters 

 belong to the smooth Atlantic umbella, or to the papillated Pacific 

 paciftca is an open one (Bigelow, 19116.) The upper surface of the 

 disk is smooth in these Philippine specimens ; but it is probable that 

 the papillae which occur in this region in large paciftca are forma- 

 tions which appear late in development. The same is true of the 

 complex branching of the limbar canals of paciftca which passes, in 

 growth, through what may be called an " umbella " stage. The 

 present specimens might develop either into umbella or into paciftca. 



Glass CTENOPHORES. 



Order BEROIDA. 



Family BEROIDAE Eschscholtz, 1829. 



Genus BEROE Fabricius, 1780. 



The genus name Beroe has usually been credited to its author, P. 

 Browne (1756), but according to the international rules of zoological 

 nomenclature, it should date from its earliest post Linnean em- 

 ployer, Fabricius (1780). 



The Beroes in the Philippine collection are all of the ovata type, 

 which, as Mortensen (1912) has conclusively shown, is merely a 

 variety of Beroe cucumis. 



