650 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



Family BICELLARIID^E. 



GEMELLARIA LORICATA. 



Mortensen has recorded young colonies of this species on the cirri of Hathro- 

 metra prolixa from northeastern Greenland. 



Family LOXOSOMATID^E. 



LOXOSOMELLA ANTEDONIS MORTENSEN. 

 Figs. 1241-1245, pi. 39. 



This species was found by Mortensen on the cirri of Hathrometra prolixa 

 from latitude 77 N. and longitude 17.5 W., in 300 meters. 



Osburn has recently recorded it from Etah, Foulke Fjord, Greenland, where it 

 occurred on the cirri of Heliometra glacialis. 



ANNELIDA POLYCHJETA. 



Family POLYNOIOE. 



The first notice of a polynoid worm as a commensal on a comatulid was con- 

 tained in a letter from R. von Willemoes-Suhm to Prof. C. Th. E. von Siebold 

 and published by the latter in 1876. Willemoes-Suhm had observed in the Arafura 

 Sea black and white worms of this type living on a large black and white comatulid. 



In 1902 A. Alcock recorded the discovery of a sea worm banded yellow and 

 purple living on a comasterid, which also was banded yellow and purple. 



In 1908 H. C. Chadwick recorded a predominantly yellow specimen of Lampro- 

 metra palmata from Suez which had a brown commensal polynoid living upon it. 



Lieut. F. A. Potts described in 1910 a species of Polynoe commensal on coma- 

 tulids which had been found by Prof. J. Stanley Gardiner in the Maldive Islands, 

 and in 1915 he described a second, which he himself had found at Torres Strait. 



POLYNOE CRINOIDICOLA POTTS. 



The original specimens were collected at the following localities: From 

 comatulids at Suvadiva Atoll ; at Kolumadulu Atoll ; with a crustacean from a 

 comatulid found on the west reef at Hulule, Male Atoll ; and from a black comatulid 

 at Miladummadulu Atol ; all these atolls are in the Maldive archipelago. 



Potts states that the examples from two localities were dark red in color, but 

 others described as commensals on black comatulids are colorless in alcohol, though 

 they were black when alive. 



POLYNOE MINCTA VAR. OCULATA POTTS. 



This worm was found by Lieutenant Potts rather frequently on the darker 

 varieties of Comanthus annulatus at Torres Strait. 



The dorsum, with the exception of two longitudinal pigment-free bands, is 

 covered by a dark brown pigment which is insoluble in 70 per cent alcohol. The 

 markings are hidden by the elytra, which are uniformly pigmented. 



