MONOGRAPH OF THE EXISTING CBINOIDS. 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 arubulacral grooves and most frequently open into them, I suppose in 

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

 the mouth. 



Host. Comanthina schlegelii. 



Localities. Singapore, and Zamboanga, Philippines. 



MYZOSTOMUM PENTACRINI VON GRAFF. 

 Figs. 1283-1285, pi. 43. 



Occurrence. In swellings on the arms. 



Host. Endoxocrinus alternicirrus. 



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



MYZOSTOMUM CLARKI M 5 CLENDON. 



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

 either end. 



Host. Metacrinus rotundus. 



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

 Suruga Gulf and Sagami Bay, southern Japan. 



MYZOSTOMUM EREMITA 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 interruptus. 

 Locality. Not definitely known. 



MYZOSTOMUM BEAIfDI VON GRAFF. 

 Figs. 1288-1290, pi. 44. 



Occurrence. In swellings on the arms. 



Host. Perissomctra ftexilw. 



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. Endoxocrinus alternicirrus. 



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



