ZOOLOGICAL RESULTS OF A TOUR IN THE FAR EAST. 
HYDROZOA AND CTENOPHORA. 
By N. Annandale, D.Sc, F.A.S B. {Zoological Survey of India). 
(With five figures in the Text.) 
With the exception of one lacustrine species, the Hydrozoa discussed in this 
paper are from brackish water of variable salinity. The lacustrine form is Cordylo- 
phora lacustris, which was found in the Kiangsu Province of China. Four brackish- 
water species, all already known from other localities, are recorded from the Tale 
Sap on the Gulf of Siam (see map on p 6 of this volume), and a new genus of 
medusae is described from the Gangetic delta. 
The Hydrozoa from the Tale Sap are Bimeria fluminalis, Annandale, Campanu- 
laria sernilata, Bale, two unidentified medusae of the family Eucopidae, Campanu- 
lina ceylonensis (Browne) and Liriope rosacea (Eschscholtz). The first and third of 
these species occur also in creeks in the Gangetic delta and in the Chilka Lake on 
the east coast of India. In the Tale Sap the six species were found in water of a 
specific gravity (corrected to a standard temperature of 15 °C.) of from 1002 to 
1-0085; but most of the medusae were apparently no more than occasional visitors 
from the sea, carried in and out of the mouth of the lake by the tide. 
The only ctenophore in the collection is identical with the Ceylon race of the 
Malaysian Plenrobrachia globosa, Moser, of which another race {bengalensis , x\nnand. 
and Kemp) occurs both in the Chilka I.ake and in the upper parts of the Bay of 
Bengal. 
Oriental Hydrozoa of Brackish Water. 
The Coelenterata and Ctenophora of the Chilka Lake have recently been dis- 
cussed in detail.' Those of the Tale Sap, a somewhat similar body of water, resemble 
them so far as the Hydrozoa are concerned, and it is probable that certain species 
will ultimately be found in most situations of the kind in different parts of the Indian 
Ocean. I take this opportunity, therefore, to consider briefly what we know of the 
1 Annandale, Mem. Ind. Mus V, pp. 65-118, pis. vi-ix (191 5). There is not much literature on the Hydrozoa that 
occur in fresh and brackish water in the Oriental Region or the adjacent parts of Asia. References to freshwater forms in 
work published before 191 1 will be found in ray volume on the Freshwater Sponges, Hydroids and Polyzoa in the Fauna 
of British India (1911). Since that date Limnocnida indica has been discovered. It is described in vol. VII of the 
Records of the Indian Museum (pp. 253-256, figs. 1-2) Gravely and Agharkar have published notes on the species in the 
same journal (vol. VII, pp. 399-403, pi. xxxvi and vol. IX. pp. 247-249). So far as the brackish- water forms are con- 
cerned the most important recent publications are my report on the Coelenterata of the Chilka Lake, Ritchie's detailed 
description of Annulella from the Gangetic delta (Rec. Ind. Mus. XI, pp. 541-568, pis. xxx, xxxa ; 1915) and Lloyd's 
account of the life-history and of the anatomy of the hydroid in Campamdina ceylonensis, Rec. Ind^ Mus. XII, 
PP- 52-57, pis. v-vii, 1916). Full reference.s to earlier memoirs will be found in the first of these papers. 
