1849.] Catalogue of Malayan Fishes. 1 28 1 



Alausa toli, Cuv. and Val. 



Alausa toli, Cuv. and Val. XX. 435. 



Ikan truboh or triibu of the Malays. 



Adult, Head above, back and upper third of the sides light green- 

 ish grey or lead-coloured ; the scales strongly iridescent silvery ; their 

 margins dotted with black ; rest of the sides, abdomen, cheeks and 

 opercles strongly iridescent silvery ; dorsal pale lead-coloured, in some 

 individuals sparingly dotted with black ; caudal scaly, pale silvery ; 

 upper lower and posterior margin minutely dotted with black ; rest of 

 the fins white. Iris mother-of-pearl, orbital margin blackish. 



Or : head and body, instead of silvery, shining reddish yellow brass 

 coloured ; fins pale reddish yellow. Iris brass coloured. 



Young. Like the adult, but with a more or less distant blackish 

 spot behind the upper part of the gill-opening and an indistinct vertical 

 blackish spot at the root of the five central rays of the caudal ; upper 

 half of dorsal closely dotted, so as to appear blackish. 



D 18, C 19f, A 19, V 8, P 15 or 16, Br. VI. 



Habit. — Sea of Pinang, Malayan Peninsula, Singapore. 



Borneo, Java, Sumatra, Pondicherry, River Cavery, 



Bombay. 



Total length : 1 ft. 6 inch. 



The length of the head is contained 4£ times in the total; the 

 diameter of the eye is £ of the length of the head ; it occupies the upper 

 third of the head ; the distance from the muzzle is J of the length of the 

 head; the distance across the arched forehead is If diameter. The 

 thick adipose fold covering the eye has a vertically elliptical aperture 

 over the pupil. The first dorsal ray is excessively short and situated the 

 length of one diameter of the eye behind the anterior third of the total 

 length. The fourth and fifth are the longest, 2\ in the greatest verti- 

 cal diameter of the body, which is contained 3£ to 2f times in the total 

 length. The upper margin of the fin is falciform ; the posterior ray a 

 little elongated ; the extent of the base is £ of the length of the head. 

 The eleventh ray is exactly in the centre between the muzzle and the 

 middle of the root of the caudal. The latter is deeply cleft ; the lower 

 lobe, a little longer than the upper, is a little less than the greatest 

 vertical diameter of the body. The extent of the base of the anal slightly 



8 b 2 



