ZOr)L()(;v OF THJv FAR FAST. 
Periophthdlmus koclreuteri is found in the seas and along the coasts of India, the 
Andamans and the Malay Archipelago. It ascends estuaries and tidal rivers. 
Family TAENIOIDIDAE. 
Taenioides nigrimarginatus. sp. nov. 
It is after considerable hesitation that I have proposed a new specific name for 
the four specimens obtained by Dr. Annandale at Singgora. In general facies and 
build the new species is very much similar to the other Indo-Australian members of 
the genus, but differs from all of them in the following combination of characters : — 
The eyes are very small and hardly distinguishable ; there are six large curved 
teeth in the upper jaw and eight in the lower; the posterior canines are absent in the 
lower jaw ; small but distinct cycloid scales are present in the ])osterior third of the 
tail region and lastly all the vertical fins, which are continuous, in alcohol specimens 
are black forming a border almost all round the fish. 
The length of the head is contained 7 5 to 7 8 times and the depth of the body 
13 to 13 5 times in the length of the fish without the caudal. The height of the 
head near the occiput is slightly greater than half of its length, while the breadth of 
the head is just about half the length. The eyes are very minute and in some speci- 
mens are hardh^ distinguishable ; they are situated high up just behind the slits of 
the posterior nostrils and are placed in the anterior third of the head. The cleft of 
Text-fig. 8. — Lateral view of Taenioides nis.ri>narginatns, sp. nov. 
the mouth is oblique and extends to just below the orbit. There is an outer row of 
curved teeth in either jaw, three of each side in the upper jaw and four in the lower 
jaw. There are several villiform rows of teeth internal to these on either jaw. I have 
not been able to find any posterior canines in the lower jaw. There is a pair of small 
barbels under the symphysis of the lower jaw and a number of still smaller ones 
slightly behind them. The dorsal and the anal fins are united to the caudal ; in 
the former there are six spines and about 48 branched rays, while in the latter there 
are about 43 rays. 
Both the dorsal and the anal fins have their bases enveloped in a membrane of 
the skin and it is usually with great difficulty that the rays can be counted. The 
caudal is pointed in the middle. No scales are present on the greater part of the 
body, but in the last third of the tail region distinct, minute, cycloid scales are visible. 
In alcohol specimens the colour of the species is very characteristic. The gene- 
ral surface of the body is pale olivaceous, but from behind the nape to the ba.se of 
the caudal fin it is marked with bluish, oblique, transverse bands, which run from 
the dorsal surface to slightly below the lateral line. These markings become more 
