678 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



Uemispeira asteriasi Fabre-Domergue. Found on the gills of M arthasterias 

 glacialis (O. F. Miiller). 



Suborder SPIROTRICHA. 



Section PEB.ITRICHA. 



Family LICHNOPHORID^E. 



Lichnop fiora aiterbachii (Cohn). Found on Cladonema and on various worms 

 (Psygnobranchus, Halosydna, Pterosyllis, Pionosyllis, Thysanozoon, etc.), mollusks 

 (Doris, Eolis, etc.) and other invertebrates, and occurring very frequently on 

 echinoderms, in which class it has been recorded from the ambulacral grooves of 

 Astropecten jonstoni (Delle Chiaje), the gills of Asterina gibbosa (Pennant), the 

 body surface of Ophiothrix fragilis (Diiben and Koren), and the gills of holo- 

 thurians. 



Family URCEOLARIID^. 



Trichvdina synapfae Cuenot. Found in the ccelomic fluids of Synapta inhcerens 

 (O. F. Miiller), at Roscoff. 



IIEMISFEIROPRIS ANTEDONIS (CUENOT). 



In 1886 Perrier mentioned and figured five specimens of a curious peritrichous 

 infusorian which he had found on Antedon bifida at Roscoff. This was described 

 in 1891 by Cuenot under the name of Trichodina antedonis, and again independ- 

 ently by Konig in 1894 under the name of R ' emispeiropsis comatulce. 



These infusorians occur on the lower (dorsal) surface of the hosts, between 

 the cirri. They crawl over the integument by means of the lower ciliated crown, 

 and they can also detach themselves entirely, swimming about by means of their 

 large peristomial cilia. 



H emispeiropsis antedonis occurs on Antedon bifida at Roscoff and at St. 

 Waast-la-Hougue, and on Antedon mvditerranea in the Mediterranean. 



Cyclochccta asterisci (Grube). Found on the gills of Asterina gibbosa (Pen- 

 nant) at Genoa. 



Cyclochceta ophiothricis (Fabre-Domergue). Found on Ophiothrix fragilis 

 (Diiben and Koren) at Concarneau. 



Urceolaria ophiocomte Giard. Found on Amphiura squamata (Delle Chiaje) 

 at Wimereaux. 



Family VORTICELLID^E. 



Vorticella amphiurce Cuenot. Found on Amphiura squamata (Delle Chiaje) 

 at Naples. 



Vorticella ophiocomc? Giard. Found on Amphiura squamata (Delle Chiaje) at 

 Wimereux. Possibly the same as the preceding. 



Vorticella, sp. Fabre-Domergue. Found in the stomachic cavity of Ophia- 

 cantha sph&rulata (Pennant) at Concarneau. Possibly V. amphiurw. 



