1314 Catalogue of Malayan Fishes. [Dec. 



Habit. — Freshwater and Sea of Pinang. 



Gangetic estuaries. 

 Total length : 7 feet 8 j- inch. 



The general form of the body is cylindrical to the posterior half of 

 the tail, which is tapering and compressed. The length of the head 

 to the gill-opening is y 1 ^ of the total or about ~ of the distance from 

 the muzzle to the anus. The horizontal diameter of the eye is J_ f 

 the length of the head ; the distance between the eyes is two diame- 

 ters : that from the muzzle to the eye 2J diameters ; to the angle of 

 the mouth it is contained 3§ times in the length of the head. The 

 apertures of the nostrils resemble those of M. thyrsoidea. The jaws 

 are nearly equal. The teeth of the upper jaw are placed in a single 

 uninterrupted series ; they are distant, pointed, with two or three in 

 front of each eye longer than the rest, which are generally small. The 

 teeth of the mesial line commence with a single series of three movea- 

 ble conical teeth, of which the second is the longest of all ; behind it 

 appears a double series of very small conical teeth, which, however, soon 

 coalesce into a single series ; opposite the eye commences a single 

 series of palatal teeth which are conical and long. Those of the lower 

 jaw consist of an external series, which is single uninterrupted and 

 formed of small distant conical teeth ; on the anterior half of each 

 branch appears an internal distant series composed of four long conical 

 teeth, of which the anterior ones are placed at a little distance behind 

 the symphysis. No tongue is distinguishable. The lateral line is 

 marked by a series of minute white pores which follow the middle of 

 the side to the caudal. The vertical diameter at the occiput is contained 

 3^ times in the length of the head ; in front of the anus it is J of, but in 

 front of the caudal it is one diameter of the eye. The dorsal originates 

 far in front of the gill-opening, at the commencement of the posterior 

 third of the head : the distance from the muzzle to the dorsal is § of 

 the length of the head, that from the dorsal to the gill-opening J. The 

 dorsal rays are short, and hid by the membrane ; their length does not 

 exceed \ of the head, of which the caudal is about TT . The anus is 

 situated at the end of the fifth-thirteenth of the total length ; the fin 

 commences at a short distance behind the vent ; the rays are a little 

 shorter than those of the dorsal. A single individual occurred on the 



