MONOGRAPH OF THE EXISTING CKINOIDS. 667 



MYZOSTOMUM CORNUTUM VON GRAFF. 



Occurrence. Free-living. 



Hosts. Thaumatometra cypris, and an undeterminable species recorded as 

 Comatula (or Antedon) triqueta. 



Localities. Challenger Station 236, south of Japan, 775 fathoms; and near 

 Bohol, Philippines. 



MYZOSTOMUM BRACHIATUM VON GRAFF. 



Occurrence. Free-living. 



Host. Comatella nigra. 



Locality. Near Bohol, Philippines. 



MTZOSTOMUM FISSUM VON GRAFF. 



Occurrence.- Free-living. 



Hosts. Uncertain; perhaps Pachylometra incequalis; another specimen was 

 found loose in a jar with Stepfianometra spicata and Lamprometra protectus. 



Locality. Challenger Station 174, near Kandavu, Fiji, 210, 225, or 610 fathoms. 



Remarks. Step hanome.tr a spicata and Lamprometra protectus are both strictly 

 littoral types and could not have occurred at any of the depths given. 



MYZOSTOMUM INTERMEDIUM VON GRAFF. 



Occurrence. Free-living. 



Host. -Zygometra microdiscus. 



Locality. Challenger Station 187, off Booby Island, Torres Strait, 6 fathoms. 



MYZOSTOMUM QUADRIFILUM VON GRAFF. 



Occurrence. Free-living. 



Hosts. Zygometra microdiscus and Fleterometra crenulata. 

 Locality. Challenger Station 186, Prince of Wales Channel, Torres Strait, 

 8 fathoms. 



MYZOSTOMUM QUADRICAUDATUM VON GRAFF. 

 PI. 52, fig. 1344. 



Occurrence. Free-living. 

 Host. Zygometra elegans. 



Localities. Challenger Station 190, Arafura Sea, 49 fathoms; and Torres 

 Strait, 10 fathoms, Alert. 



MYZOSTOMUM LOBATUM VON GRAFF. 



Occurrence. Free-living. 

 Host. CapiUaster multiradiata. 

 Locality. Near Bohol, Philippines. 



