CYPftlNODON. 411 



2. CYPRINODON DISPAR. 



(Plate LXXIX. figs. 3 & 4.) 



Leilas dispar, Riippell, Fische Roth. Meer. p. 66, pi. xviii. figs. 1 & 2 (1828). 



Cyprinodon lunatus, Cuvier & Valenciennes, Hist. Poiss. xviii. p. 161 (1846). 



Cyprinodon dispar, part., Gunther, Cat. Fish. vi. p. 303 (1866). 



Cyprinodon dispar, Klunzinger, Yerh. zool.-bot. Ges. Wien, xx. 1870, p. 587 ; Day, Fish. Ind. 



p. 521, pi. cxxi. figs. 1 & 2 (1877). 

 Cyprinodon stoliczkanus, Day, Journ. As. Soc. Beng. xli. 1872, p. 258. . 

 Lebias dispar, part., Garman, Mem. Mus. Comp. Zool. xix. 1895, p. 34. 



This species has not actually been found in fresh water in any part of the Nile Basin, 

 but as it seems to be widely distributed along both coasts of the Red Sea, in tidal pools 

 and at the mouths of rivers, and as it is known to occur in hot springs in Arabia and 

 Persia and in fresh water in Cutch, it will probably be found in inland waters in Egypt 

 in the neighbourhood of the Red Sea. It is included here on this supposition. 



C. dispar is very closely allied to, and difficult to distinguish from, G. fasciatus, but 

 it grows to a larger size, it has only 9 or 10 rays in the dorsal fin, and 10 or 11 in 

 the anal, and the caudal fin, which is truncate, is marked in the male with two or three 

 crescentic black bands ; the dark and light cross-bars on the body, which are more or 

 less distinct in the female, are replaced in the adult male by numerous round light 

 (in life blue) spots. 16 to 20 teeth in each jaw. 26 to 28 scales in the lateral line, 

 22 or 24 round the body. 



Grows to a length of 80 millimetres. 



Measurements (in millimetres). 



Total length (without caudal) 50 47 



Depth of body 14 14 



Length of head 14 13 



"Width of head 9 9 



Length of snout 3 3J 



Diameter o£ eye 4 3^ 



Interorbital width 6 6 



Longest ray of dorsal fin 16 8 



„ „ anal fin 15 7 



Length of pectoral fin 11 9 



„ ventral fin 8 6 



In describing this species, Ruppell observed that it is found all round the Red Sea, 

 in salt water, but that it occurs also in the thermal freshwater spring of Hadjer Elme 



3g2 



