426 athekinim:. 



Caudal peduncle twice and a half to three times as long as deep. Scales smooth, 

 43 to 48 in a longitudinal series, 20 to 24 round the body in front of the ventral fins. 



Yellowish, with a silvery lateral stripe running along the fourth or fifth row of 

 scales below the spinous dorsal fin ; upper half of body with dark brown dots, which 

 may be crowded round the edges of the scales or form small blotches on the back ; 

 fins white. 



The largest Egyptian specimen measures 78 millimetres. 



In addition to six specimens from the Mediterranean coast of Egypt, from Ruppell's 

 Collection, mentioned in Gunther's Catalogue, I have examined about thirty specimens 

 from Lake Temsah, presented by Sir R. Owen in 1871, and about forty from Lake 

 Menzaleh, collected by Mr. Loat near Ghet-el-Nassara (28.5.99), at one of the islands 

 in the lake (7.5.99), and at Gemil, close to the shore (28.6.99). It is called Sardeena 

 by the fishermen. 



I am indebted to Prof. Vaillant for notes on the type specimens of A. mochon 

 (Iviza, Delaroche) preserved in the Paris Museum. The largest measures 71 millim. 

 (61 without the caudal fin) ; the distance between the end of the snout and the dorsal 

 fin, in this specimen, is 31 millimetres, that between the end of the snout and the 

 ventral being 26 or 27. 22 gill-rakers on the lower part of the anterior branchial 

 arch. 26 scales round the body in front of the ventral fins. 



In a specimen of nearly the same size, from the Gulf of Cagliari, determined 

 by Mdlle. Borsieri as A. mochon, received with others from the same locality from 

 Prof. Vinciguerra, who has most kindly answered my enquiries respecting this fish, 

 the total length, without the caudal fin, being 64 millim., the distance between the 

 end of the snout and the dorsal fin is also 31 millim., whilst that between the end of 

 the snout and the ventral fin is only 24, the number of gill-rakers on the lower 

 part of the anterior arch is 27, and there are 20 scales round the body. 



I therefore feel confident that Delaroche's "Mocho" falls into Mdlle. Borsieri's 

 definition of A. rissoi, and that the A. mochon of most Italian authors constitutes a 

 distinct species ; this, so far as I can find out, is still unnamed, and, as being the 

 " Latterino comune " of Bonaparte, I propose to designate it A. bonapartii. 



