666 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



MTZOSTOMUM ROTUNDUM VON GRAFF. 



Occurrence. — Free-living. 



Host. — Comactinia echinoptera. 



Locality. — Blake Station 249, off Urenada, 262 fathoms. 



MTZOSTOMUM OBLONGUJI VON GKAFF. 



Occurrence. — Free-living. 



Host. — Probably Comactinia echinoptera. 



Locality. — Blake Station 249, off Grenada, 262 fathoms. 



MTZOSTOMUM OBLONGUM VON GRAFF. 



Occurrence. — Free-living. 

 Host. — N eocovxatella pulchella. 



Localities.— Blake Stations 210, off Martinique, 191 fathoms; 224, off St. Vin- 

 cent, 114 fathoms; and 269, off St. Vincent, 124 fathoms. 



MTZOSTOMUM ELEOANS VON GRAFF. 



Occurrence. — Free-living. 



Hosts. — Comanthus parvicirra, Comactinia meridionalis, and an unidentifiable 

 comatulid recorded as Comatula (or Antedon) triqueta. 



Localities. — Near Bohol, Philippines ; and off French Eeef , Florida. 



MTZOSTOMUM e\t;rmanni m clendon. 



Occurrence. — Free-living. 



Host. — Comactinia echinoptera. 



Locality. — Albatross Station 2166, off Habana, Cuba, 196 fathoms. 



MTZOSTOJrUM ANTENNATUM VON GRAFF. 



Occurrence. — Free-living. 



Host. — Kecorded by von Graff as uncertain; McClendon foimd it on Comanthus 

 pinguis and on M etacnnus rotiindus. 



Localities.— Amoy, China, and Suruga Gulf and Sagami Bays, southern Japan. 



Remarks. — According to McClendon the following should be considered a 

 synonym of this species: 



MTZOSTOMUM AMBIGUUM VON GRAFF. 

 Fig. 12G6, pi. 41. 



Occurrence. — Free-living. 



Host. — This species was found lying loose in a jar with Comatula Solaris, 

 Comanthus bennetti, and five endocyclic comatulids. 

 Locality. — Moluccas. 



