672 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



MYZOSTOMUM DEFORMATOR VON GRAFF. 

 Figs. 1277-1279, pi. 43. 



Occwrence. Within the pinnules, which become swollen and ovoid. 



Host. Endoxocrinus altcrnicirrus. 



Locality, Challenger Station 214, off the Meangis Islands, 500 fathoms. 



MYZOSTOMUM CYSTICOLUM VON GRAFF. 



Figs. 1276, pi. 42, and 1293-1297, pi. 44. 



Occurrence. In independent sessile cysts on the pinnules and on the ambu- 

 lacral side of the arms. 



Hosts. Comactinia echinoptera, Comactinia meridionalis, and Anthometra 

 adriani. 



Localities. Off Cape Frio, Brazil; Blake Station 249, off Grenada, 262 

 fathoms; and shores of the Antarctic Continent near Mounts Erebus and Terror, 

 500 fathoms. 



MYZOSTOMUM CYSTICOLUM YAH. CYSTIHYMENODES M'CLENDON. 



Occurrence. In uncalcified ovoid cysts protruding from the ambulacral groove 

 of the arms. 



Host. Florometra asperrima. 



Locality. Off the Trinity Islands. Gulf of Alaska, 159 fathoms, at Albatross 

 Station 2853. 



MYZOSTOMUM CYSTICOLUM VAR. ORIENTALS M'CLENDON. 



Occurrence. Found in a cyst 5 mm. in length with a pore at each end, which 

 contained two individuals, a large one occupying nearly the cavity of the cyst and 

 a small flat one between the larger and the wall of the cyst near one of the pores. 



Host. One or more of the local species of Calometridse. 



Locality. Southern Japan. 



MYZOSTOMUM TENUISPINUM VON GRAFF. 

 Figs. 1254, pi. 40, 1270-1275, pi. 42, and 1298, 1299, 1302-1304, pi. 44. 



Occurrence. In roundish arm cysts. 



Hosts. Pachylometra inwqualis, Perissometra angusticalyx, C haritometra 

 basicurva, and C haritometra incisa. 



Localities. Challenger Stations 170, off the Kermadec Islands, 630 fathoms; 

 174, near Kandavu, Fiji, 210, 225, or 610 fathoms: and 214, off the Meangis Islands, 

 500 fathoms. 



MYZOSTOMUM WII.LEMCESII VON GRAFF. 

 Figs. 1267-1269, pi. 42, and 1291, 1292, pi. 44. 



Occurrence. In spiral malformations of the pinnules. 



Hosts. Pachylometra incequalis, Perissometra flexilis, and Charitometra basi- 

 curva. 



