660 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



MYZOSTOMUM COSTATUM F. 8. LEUCKAKT. 

 Figs. 1255-1262, pi. 40. 



OccurTence. — Free-living. 



Hosts. — ComatuJa sola7'is, Co7nanthus parvicirra, Heterometra savignii, fLcmip- 

 rometra palmata, Prometra chadwicki, and ophiurans commensal on Heterometra 

 savignii. Comatula, or Antedon, tnqueta Semper, MS., is also given as a host of 

 this species, but this form has never been identified. 



Localities. — Red Sea; Tur, near Sinai; Ul Shubuk, 9 fathoms; Suez Bay, 10 

 fathoms; near Bohol, Philippines. 



MYZOSTOMUM PLICATUM VON GRAFF. 



Occw^ence. — Free-living. 

 Host. — Comatclla stelligera. 

 Locality. — Australia. 



MYZOSTOMUM RUBROFASCIATUM VON GRAFF. 

 Fig. 1263, pi. 40, 



Occurrence. — Free-living. 



ZTos^.— -Uncertain ; Boulenger states that his specimens were obtained from an 

 unidentified comatulid. 



Localities. — Tur, near Sinai, Eed Sea ; Forculch Barrier Island, Eed Sea. 



MYZOSTOMUM PARASITICUM F. S. LEUCIvART. 



Synonyms. — Myzostomum glabrum F. S. Leuckart. 

 Myzostomum tuherculosum Semper. 



Occurrence. — Free-living; this species is found on the disk in the immediate 

 vicinity of the mouth. 



Hosts. — Antedon adriatica, A. mediterranea, A. bifida, and A. petasus. 



Localities. — Adriatic Sea, at Cattaro; Mediterranean Sea, at Naples. It is 

 stated to be very common on the disks of the several species of Antedon in all 

 European seas. 



MYZOSTOMUM OIGAS (LL'TKEN, MS.) VON GRAFF. 



Occurrence. — Free-living. 



Hosts. — Hellometra glacialis and Tropiometra picta. 



Localities. — Barents Sea (lat. 76° 51' N., long. 44° 20' E.), 145 fathoms; 

 Barents Sea (lat. 74° 71' 04" N., long. 50° 23' E.), 84 fathoms; Porcupine Station 

 57, 1869, southeast of the Faroe Islands (lat. 60° 14' N.; long. 6° 17' W.), 632 

 fathoms ; Jan Meyen ; Proven, north Greenland, 50 fathoms ; Challenger Station 48, 

 Le Have Bank (lat. 43° 04' N., long. 64° 05' W.), 51 fathoms; Bahia, Brazil. 



MYZOSTOMUM GIGANTEUM NANSEN. 



Occurrence. — Free-living. 

 Host. — Hathrometra prolixa. 

 Locality. — 



