670 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



MYZOSTOMUM METACRINI M'CLENDON. 



Occurrence. Free-living. 



Host. Metacrinus rotundus. 



Locality Southern Japan, Suruga Gulf and Sagami Bay. 



MYZOSTOMUM CUBANUM M'CLENDON. 



Occurrence. Free-living. 



Host. Uncertain. 



Locality. Albatross Station 2156, off Habana, Cuba, 289 fathoms. 



Occurrence. Free-living. 



Hosts. Florometra serratissima and F. perplexa. 



Localities. Albatross Stations 3449, off the state of Washington, 135 fathoms; 

 and 3350, off northern California, 75 fathoms ; and off Pacific Grove, California. 



MYZOSTOMUM CRO8SLANDI BOULENGER. 

 Figs. 1251-1253, pi. 40. 



Occurrence. Free-living. 



Hosts. Heterometra savignii, Promctra chadwicki, and an undetermined 

 comatulid. 



Localities. Red Sea ; Ul Shubuk, and Suez Bay, in 10 fathoms. 



MYZOSTOMUM AXTARCTICUM VON STUMMER-TRAUNFELS. 



Occurrence. Free-living. 

 Host. Anthometra adriani. 



Locality. Shores of the Antarctic continent, in 124 fathoms ; winter quarters 

 of the Discovery. 



MYZOSTOMUM ASYMMETRICUM VON GRAFF. 



Fig. 1282. pi. 43. 



Occurrence. Sticking fast to, and enlarging, the pinnules. 



Host. Endoxocrinus alternicirrus. 



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



MYZOSTOMUM PLATYPUS VON GRAFF. 



Figs. 12S6, 12S7, pi. 43, and pi. 57, fig. 1363. 



Occurrence. In swellings on the disk. In regard to these swellings P. H. 

 Carpenter wrote to Professor von Graff : 



Among six individuals of Actinometra no'bilis [Comanthina schlegcUi] from Sarubounga I 

 find one with some structures on the disk that I now recognize as Myzostonta cysts, though 

 I did not know them in 1S78. They seem to have no plating whatever, which Is curious. I 

 send you one with the Myzostoma inside, which I cut from a corner where the disk was torn; 



