678 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



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

 fflacialis (O. F. Miiller). 



Suborder SPIROTRICHA. 



Section FERITKICEA. 



Family LICHNOPHORID^. 



Lichnop/iora auerbacMi (Cohn). Found on Cladonema and on various worms 

 (Psyflnohranchus, Halosydna, PterosylliK, 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 Astenna gibhosa (Pennant), the 

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

 thurians. 



Family URCEOLARIID^. 



Trichodina synaptm Cuenot. Found in the coelomic fluids of Synapta inhcerens 

 (O. F. Miiller), at Roscoff. 



IIEMISPEIROPSIS ANTEnONIS (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 Tnxihodina antedonis, and again independ- 

 ently by Konig in 1894 under the name of Ilemispeiropsis comatulce. 



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

 the cirri. The}' 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. 



Hemispeiropsis antedonis occurs on Antedon bifida at Roscoff and at St. 

 Waast-la-Hougue, and on Antedon ineditei^anea in the Mediterranean. 



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

 nant) at Genoa. 



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

 (Diiben and Koren) at Concarneau. 



Vrceolaria ophioconuB Giard. Found on Amphiura squamata (Delle Chiaje) 

 at Wimereaux. 



Family VORTICELLID^. 



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

 at Naples. 



Vorticella ophiocomfv Giard. Found on Am,phiura sqvam.ata (Delle Chiaje) at 

 Wimereux. Possibly the same as the preceding. 



Vorticella, sp. Fabre-Domei'gue. Found in the stomachic cavity of Ophia- 

 cantha sphtemlata (Pennant) at Concarneau. Possibly V. amphiurm. 



