MONOGEAPH OF THE EXISTING CRINOIDS. 671 



and I shall have another part of the disk with a group of cysts drawn by my best artist. They 

 are always close to the ambulacrnl grooves and most frequently open Into them, I suppose In 

 order that the Mysostoma may get hold of some of the food particles which are traveling towards 

 the mouth. 



Host. — Comanthina schlegelii. 



Localities. — Singapore, and Zamboanga, Philippines. 



mtzostomtjm: pent.\crini von graff. 

 Figs. 1283-1285, pi. 43. 



Occurrence. — In swellings on the arms. 



Host. — Endoxoci-inus altemicirrus. 



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



MTZOSTOMUM CLAEKI m'cLENDON. 



Occurrence. — In cysts in the form of an oval enlargement with a pore at 

 either end. 



Host. — Metacrinus rofundus. 



Localities. — Albatross Station 3741, off southern Japan, 63 to 68 fathoms; and 

 Suruga Gulf and Sagami Bay, southern Japan. 



>,is(/v'rJ.M MTZOSTOMUM EREillTA WHEELER. 



Occurrence. — In cysts. 



Host. — Metacrinus moseleyi. 



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



MYZOSTOMUM CRYPTOPODIUM WHEELER. 



Occurrence. — In a smooth pea-shaped calcareous cyst. 

 Host. — Metacrinus intei^niptus. 

 Locality. — Not definitely known. 



MYZOSTOMUM BB^ARDI VON GRAFF. 

 Figs. 1288-1290, pi. 44. 



Occurrence. — In swellings on the arms. 



Host. — Perissomctra flexilis. 



Locality. — Challenger Station 192, near the Kei Islands, 140 fathoms. 



MYZOSTOMUM BELLI WHEELER. 



Occurrence. — In hard calcareous galls at the base of the arms. 



Host. — E7idoxociinus altemicirrus. 



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



