1903.] ON COELENTERATA FROM ZANZIBAR. 113 
will take no notice of her: also that he is ready whenever she is. 
I can offer no opinion as to whether the companionship of the 
tusker tends to bring the female into season or not. 
I must draw attention to the way in which both the tusker and 
female absolutely ignored our presence. As I have already stated, 
the camera was set up within 10 yards of the tethered female, 
quite out in the open without any attempt at concealment; and 
though there were sometimes six or eight spectators walking about 
and talking within this short distance, on no occasion did either 
the tusker or the female take the slightest notice of us or even look 
ow way. Directly the act of copulation was over, the mahout 
called out to the tusker, who, at the word of command, came towards 
him, knelt down, and allowed himself to be mounted and ridden off, 
As I have said, the female was always tethered fore and aft 
with a long chain, but this was solely with the object of prevent- 
ing her swinging ‘round and so getting out of focus; but in no 
single instance did she attempt to do this, nor was the chain once 
needed except, of course, in the case of the first female who was 
not In season. 
7. On the Coelenterata collected by Mr. C. Crossland in 
Zanzibar.—I. Ceratella minima, n. sp. By Sypney J. 
Hickson, M.A., F.R.S., F.Z.S8., Beyer Professor of 
Zoology in the Owens College, Manchester. 
[ Received December 16, 1902. ] 
(Plate XIII’) 
Our knowledge of the remarkable family of Hydrozoa, the 
Ceratelladie, has been ably summarized in the memoir published 
by Prof. Spencer in the Transactions of the Royal Society of 
Victoria, 1892 (4). The hitherto recorded species are distributed 
as follows :—Cer atella fusca: Coogee, Bondi (N.S.W.), Broughton 
Island, Flinders Island, Lord Howe Island. C. procumbens « C: ape 
of Good Hope, Natal. CO. spinosa: Port Natal. Chitina ericopsis : 
New Zealand. Dehitella atrorubens: Delagoa Bay. In brief, 
the family has hitherto been known to occur only in Australasian 
and §. African waters. 
The discovery of a new species of the genus Ceratella in the 
tropical waters of the Zanzibar coast is in itself worthy of note, 
but especially so in view of the fact that it is associated with 
corals, aleyonarians, and other animals characteristic of the 
tropical belt of the Kast African coast. I am indebted to 
Mr. C. Crossland, of Clare College, Cambridge, who collected the 
three specimens “during his recent expedition to Zanzibar, for 
permission to examine and describe them. 
The African species of the family have not yet been accurately 
described, but the accounts of Gray (1) and Carter (2) are 
! Wor explanation of the Plate see p. 116. 
Proc. Zoot. Soc.—1903, Vou. I. No. VIII: 8 
