MONOGKAPH OF THE EXISTING CRXNOIDS. 663 



MTZOSTOMUSr BRE\TrCinKUM VON GRAFT. 



Occurrence. — Free-living. 

 Host. — Comanthus parvicirra. 



Localities. — Between Swatow and Formosa (Taiwan) (lat. 23° 20' N., long. 

 118° 30' E.), 17 fathoms, and the Tonga Islands. 



MYZOSTOMUM PICTUM VON GRAFF. 



Occurrence. — Free-living. 



Host. — Probably Stylometra spinifera. 



Locality. — Blake Station 1.57, off Montserrat, West Indies, 120 fathoms. 



■""■ MTZOSTOMUM NIGRESCF.NS VON GRAFF. 



Occurrence. — Free-living. 

 Host. — Comanthus parvicirra. 

 Locality. — Tokyo Bay, Japan. 



MYZOSTOMUM CIRRTFERUM F. S. LF.UCKART. 



Synonyms. — Cyclocirra thompsonii J. Miiller. 

 Myzostomum thornsoni Diesing. 

 Myzostomum scTiultzeanum Diesing. 



Occurrence. — Free-living. 



Hosts. — Antedon petasus, A. hifda, A. mediterranean A. adnatica, and Hath- 

 rometra prolixca. 



Localities. — Probably cold area, Faroe Channel {Porcupine, 1869) ; Triton 

 Station 3, on the P'aroe Banks (lat. 60° 39' 30" K., long. 9° 06' 00" W.), 87 

 fathoms; Norway; Arendal, Norway; western coast of Sweden; Cattegat; Bressay 

 Sound. Shetland, 5 to 7 fathoms: "northern seas"; Arran, .5 to 10 fathoms; Isle 

 of Man; Oban; Keumaes Bay, north coast of Anglesea; Torquay; Ireland; Naples; 

 Trieste. 



Keinarks.—lL\ds. is the species that was mistaken by Delle Chiaje for a madre- 

 poric plate. Miiller recognized his figure as representing a parasite similar to the 

 one to which attention had already been called by J. V. Thompson, upon which he 

 bestowed the name of Cyclocirra thompsonii. 



MYZOSTOMUM CERRTFEROIDIUM m'cLF-NDON. 



Occurrence. — Free-living. ' 



Hosts. — Crinometra insculpta and Analcidoinetra armata. 

 Localities. — Albatross Stations 2752, off St. Vincent, West Indies, 281 fathoms; 

 2753, off St. Vincent, 281 fathoms ; and 2146, near Colon, 34 fathoms. 



MYZOSTOMU5t CRENATUM VON GRAI F. 



Occxirrence. — Free-living. . ■■ • . 



Host. — fComactinia meridionalis. 



Localities.- — Blake Station 203, off Martinique, 10 to 27 fathoms; and Inves- 

 tigator Station near St. Lucia (lat. 13° 22' N., long. 61° 07' W.). 278 fathoms. 

 142140— 21— Bull. 82 44 



