^72 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



MYZOSTOMUM DEFORMATOR VON GRAFF. 

 Figs. 1277-1279, pi. 43. 



Occurrence. — Within the jjinnules, which become swollen and ovoid. 



Host. — Endoxocnnus altemicirrus. 



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



MTZOSTOMUM CTSllCOLUM 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. — C'omactinia echinoptera, Comactinia Tneridionalis, 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. y\-^viyjv> 



MTZOSTOMUM CTSTICOLUM VAR. CTSTIHTMENODES m'cLENDON. 



Occurrence. — In uncalcified ovoid cysts protruding from the ambulacra] groove 

 of the arms. uoji;'^ bn« tlisi • 



Host. — Florotnetra asperrima. 



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

 Station 2853. 



MTZOSTOMUM CTSTICOLUM VAR. ORIENTALE 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 Calometridae. 



Locality. — Southern Japan. 



MTZOSTOMUM TENUISPINUM VON GRAFF. 

 Figs. 1254. pi. 40, 1270-127.'i. pi. 42. and 1298, 1299, 1302-1304, pi. 44. 



Occurrence. — In roundish arm cysts. 



Hosts. — Pachylometra ma>qualis, Perissometra angusticalyx, Charitometra 

 iasicurva, and Charitometra 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. 



MTZOSTOMUM WIIJ.EMCESII VON GRAFF. 

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



Occurrence. — In spiral malformations of the pinnules. 



Hosts. — Pachylometra incequalis, Perissometra fexilis, and Charitometra iasi- 



