680 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



POLYTREMA MINIACEUM (LINNAEUS). 



P. H. Carpenter has recorded this species as common on the stems and cirri 

 of the pentacrinites dredged by the Challenger near the Kei Islands in 140 fathoms 

 and off the Meangis Islands in 500 fathoms. 



It was similarly abundant on the pentacrinites dredged by the Albatross 

 in the Philippines, usually in the variety alba Carter, and is also found on the 

 pentacrinites in the Caribbean Sea. 



It is unusual to find this form on the cirri of the, comatulids, though it occurs 

 sporadically (pi. 53, fig. 1346). 



The crinoids in association with which parasitic or commensal organisms have 

 been recorded are the following : 



COMATELLA NIGRA. 



Myzostomum brachiatum,. 



COMATELLA STELIJGERA. 



f Myzostomum echinus. Myzostomum plicatum. 



NEOCOMATELLA PULCHELLA. 



Myzostomum abundans. Myzostomum, cannatum. 



Myzostomum inflator. 



CAPILLASTER SENTOSA. 



Ophiomaza cacaotica. Ophiomaza obscura. 



CAPILLASTKR MULTIRADIATA. 



Sabinella capillastericola. Myzostomum lobatum. 



NEMA9TER IOWEN8I8. 



Myzostomum margindtum. . 



NEMASTER RUHIGINOSA. 



Myzostomum testudo. 



NEMASTER DTSCOIDEA. 



Myzostomum marginatum. 



COMATULA ROTALARIA. 



Anilowa, sp. ^Myzostomum horologium. 



COMATULA SOLARIS. 



Anilocra, sp. Myzostomum pallidum. 



Ophiophthiriux actinometrce. fMysostomum dentatvm. 



fMyzostomum holorogium. f Myzostomum a-nthiguuum. 



Myzostomum costatum. Myzostomum carinatum. 



COMATULA PURPUREA. 



Synalpheus brucei. Ophiomaza cacaotica. 



