662 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



Greenland (lat. 77 18.5' N., long. 18.5' W.), in 304 meters, and (lat. 76 06' N., 

 long. 13 26' W.), in 200 to 250 meters. 



MTZOSTOMUM AEEOLATUM VON GRAFF. 



Occurrence. Free-living. 



Hosts. Comactinia echinoptera and Comactinia meridionalis (recorded as 

 Actinometra blakei and Actinometra meridionalis var. quadrata. 



Localities. Blake Stations 172, off Guadeloupe, 62 to 100 fathoms; 203, off 

 Martinique, 10 to 27 fathoms; and 278, off Barbados, 69 fathoms. 



MTZOSTOMUM TRISTE VON GRAFF. 



Occurrence. Free-living. 



Hosts. Comanthus parvicirra, and undetermined comatulids recorded as 

 " uncertain," and " Comatula, sp., in 111. Semper collectione No. 6 signata." 



Localities. Near Bohol, Philippines, and Oceania ("Tahiti, Samoa, etc."). 



MYZOSTOMUM CORIACEUM VON GRAFF. 



Occurrence. Free-living. 



Host. Colobometra perspinosa, and " a black Actinometra (n. sp.)." 



Localities. Port Denison, Queensland, 3 to 4 fathoms ; Moluccas. 



Remarks. The host of this species was originally recorded as Antedon insignis 

 Bell; later von Graft stated, on the authority of P. H. Carpenter, that Bell had 

 changed his specific name insignis to loveni; but insignis-loveni is the same species 

 that had previously been described by Carpenter under the name perspinosa. 



MTZOSTOMUM RAPIATUM VON GRAFF. 



Occurrence. Free-living. 



Host. A species closely allied to, if not, Comactinia meridionalis. 



Locality. Near Barbados. 



MTZOSTOMUM PULVTNAR VON GRAFF. 



Occurrence. Free-living. 



Hosts. Leptometra celtica and L. phalangium. 



Localities. The Minch, 60 to 80 fathoms; off Loch Scavaig. Skye; Bay of 

 Sorrento (near Naples). 



MYZOSTOMUM CALTCOTTLE VON GRAFF. 



Occurrence. Free-living. 



Host. Endoxocrinus alternicirrus. 



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



MTZOSTOMUM COMPRESSUM VON GRAFF. 



Occurrence. Free-living. 

 Host. Ilycrinus australis. 



Locality. Challenger Station 146, in the vicinity of the Crozet Islands (lat. 

 46 46' S., long. 45 31' E.), 1,375 fathoms. 



