674 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



MTZOSTOMUM, 8P. 



Occurrence. — Free-living. 

 Host. — Glyptometra tuherosa. 



Locality. — Challenger Station 210, oflF Panglao and Siquijor, Philippines, 375 

 fathoms. 



MYZOSTOMUM, SP. 



Occui'rence. — Free-living. 



Host. — Amphimetra 7nolleri or Zygometra comata. 



Locality.— PadsLU Bay, Mergui Archipelago. 



MTZOSTOMUM, SP. 



Occurrence. — Free-living. 



Host. — Possibly T hauraatometra tenuis; Professor von Graff gives the host as 

 " a small form of Antedon." 

 Locality. — Vladivostock. 



MTZOSTOMUM, SP. 



Occurrence. — Free-living. 



Host. — "Antedon, sp." 



Locality. — Blake Station 219, off St. Lucia, 151 fathoms. 



PROTOMYZOSTOMA POLTNEPHRIS FEDOTOV. 



Occurrence. — Endoparasitic, in the genital organs. 



Hosts. — Two ophiurans of the family Gorgonocephalidse, Gorgonocephalus 

 eucnemis (Miiller and Troschel) and G. arcticus Leach. 



Localities. — Kola Fjord, 100 to ISO meters (in Gorgonocephalus eucnemis) ; 

 Kara Sea (in G. arcticus). 



STELECHOPUS HTOCRINI VON GRAFF. 



Occurrence. — Free-living. 



Host. — Hyocrinus hethellianus (in the original description given as Hyocrinus 

 hetheUianus and Ilycrinus atistralis, but later corrected). 



L^ocalities. — Challenger Stations 146, west of tlie Crozet Islands (lat. 46° 46' S., 

 long. 45° 31' E.), 1,375 fathoms; and 147. between Marion Island and the Crozets 

 (lat. 46° 16' S., long. 48° 27' E.) . 1.600 fathoms. 



Dr. L. E. (iriffin reports finding undetermined species of mj'zostomes on speci- 

 mens of Sfephano7iietra echinus and S. oxyacantha taken at Port Galera. Mindoro, 

 Philippines. 



It is an interesting fact that the myzostomes are parasitized b}' several internal 

 organisms belonging to groups not known to infest their hosts. 



Nansen has described a tapeworm, Tcpnia my^ostoma, from Myzostonium 

 grafp,. Dr. Brayton H. Ransom writes me that from Nansen's description it is 



