494 
zoolo(;y of the kar east. 
The species can be readily distinguished from Glossogobius giuris, with which it is 
often confused, by the possession of smaller eyes and a narrower and more pointed 
snout. The head is not as broad as in G. giuris and, moreover, the general facies 
is also different. 
Glossogobius kokiiis is an entirely marine form and is found along the coasts 
of India, the Andamans and the Malay Archipelago. Ct. giuris has a wider 
distribution and occurs in fresh and brackish w^aters as w^ell. 
Ctcnogobius alcocki (Annandale). 
i9o(). (•(ibiiis alcocki, Annandale, Joitrn. As. Soc, Bengal (n. s.) II. p. 2or. fic;. i. 
1923. Cteiiogobius alcocki. Hora, Mew. Ind. Miis. V, p. 744. 
There are several young and full-grown specimens in Dr. Annandale' s collection 
from the Tale Sap w^hich I refer to this species. Most of the specimens were 
obtained in fresh water at the mouth of the Patalung River near Lampan, while 
one individual was netted on the north end of Koh Si Hah during shore collect- 
ing. 
I have compared in detail the Tale Sap specimens wdth the types of the species 
in the collection of the Indian Museum and find that they agree fairly closely. Two 
examples from the mouth of the Patalung River are about 21 mm. in total length 
including the length of the caudal fin; these differ slightly in colouration and 
proportions from the other smaller specimens. In Indian waters this species has 
not been recorded larger that 16 mm. in total length including the length of the 
caudal fin. 
Ctenogobius alcocki is a fresh and brackish water form. It has hitherto been 
recorded from the brackish waters near Port Canning and Calcutta and from the 
Chilka Lake. There are two specimens of this species in the collection of the Indian 
Museum obtained in a tank at Rajshahi in Eastern Bengal. Recently I have 
collected 2 specimens of this species in a fresh-water stream at Puri. 
Ctenogobius cylindriceps Hora. 
1923. C/otogohius cylindriceps, Hora, Mem. Ind. Mii\. W y>. 745. figs. 26-28. 
This species is represented in the collection by five specimens only. They were 
obtained by Dr. Annandale in the channel between Koh Yaw and the mainland. 
The specimens are not in a good state of preservation for detailed morphological 
investigations, but resemble the typical specimens from the Chilka Lake in 
colouration, dentition and the shape and form of the tongue. In the Siamese 
examples the scales have been rubbed off and the colour is very much faded. 
A Tale Sap specimen about 16 mm. in length is full of eggs, w^hich are numerous and 
are closely packed together. The longest diameter of the egg is about 0-5 mm. 
Ctenogobius cylindriceps has recently been described from numerous specimens 
collected in the Chilka Lake, where it is found all over the place both in fresh water 
and water as saline as that of the Bay of Bengal outside. 
