A NEW SPECIES OF 
CEPHALOGMHI-sCUS 
(C. GILCHRISTI) 
FROM THE 
CAP Ey Slee 
BY 
W. G. RIDEWOOD;: D:Sc., 
Lecturer in Biology at St. Mary’s Medical School, University of London, 

The material here described consists of 19 specimens (1.é., 
pieces of colony) obtained on nine different occasions in the 
Cape Seas, mostly at depths of about 30 fathoms, although 
some of them were dredged from greater depths. The speci- 
mens, were dredged by Dr. J. D: F. Gilchrist; and sent to 
Professor E. Ray Lankester, Director of the Natural History 
Museum, London, to whom I offer my thanks for his kindness 
in allowing me to examine and describe them. By way of 
recognition of the service which Dr. Gilchrist has rendered 
to science by his successful efforts to obtain this Cephalodiscus 
in quantity after his interest had been aroused by the dredg- 
ing of a small piece of it, I name the species C. gilchristi. 
In the following list of the material I distinguish the various 
specimens by the numbers appended to them by Dr. Gilchrist, 
or his assistant. at the time of dredging. The finest specimen 
is that numbered 18551, and of this a photograph of the 
natural size is reproduced in plate 1; the other pieces are all 
small, rarely consisting of more than one branch each. Dr. 
Gilchrist has been at great pains to harden these smaller 
pieces of material in various fixing fluids of acknowledged 
efficiency, so that the polypides might be in good condition 
for histological investigation. 
Specimen 1945; January roth, 1900; Cape St. Blaize, N. 
by W., 3 miles; 30 fathoms; bottom, mud; fixed in 3 per 
cent. formalin, and transferred to 70 per cent. alcohol. 
