THE DEVELOPMENT OF THE CAPE CEPHALOD1SCUS. 189 
On the Development of the Cape Cephalodiscus 
(C. gilchristi, Ridewood). 
By 
.1. I>. F. Gilchrist, M.4., l>.Sc., Pli.D. 
With Plates 13 and 14. 
In October, 1915, I recorded some observations on living 
specimens of the Cape Cephalodiscus, its eggs and 
larvae ( 4 ). I had hoped in the following summer to be able 
to procure additional specimens, more especially of advanced 
larvae, showing the process of metamorphosis. Contrary 
however, to all expectations, not a single living specimen 
was procured by the trawlers during the summer months. 
One colony, very much damaged, and with the zooid cavities 
filled with sand grains, was found on a sandy bottom, some 
six or eight miles from the usual habitat of the animal, of 
value only as indicating that the animal may be carried some 
distance by currents. The reason for this scarcity probably 
was, as suggested by the captains of the trawlers, that there 
had been no heavy seas, and no great “drawback ” or strong 
currents to detach the colonies from the rocky ground 
which, there is reason to believe, is their natural habitat. 
The material, procured during the previous summer, how- 
ever, has proved on examination sufficient to indicate some 
new facts regarding the development of the animal, which it 
may be desirable to put on record, without waiting an 
indefinite time for the uncertain possibility of procuring and 
rearing the larvse to later stages. 
This material was preserved in a variety of ways. Subli- 
