TETEODON. 



143 



1. TETRODON FAHAKA. 

 Linn, in Hasselq. Reise Palest, p. 441 (1762) ; Giinth. Cat. Fish. viii. p. 290 



(1870); Bouleng. Fish. Nile, p. 544, pi. scvii. (1907); Peltegr. Poiss. Bass. 



Tchad, p. 140, fig. (1914). 

 Tetrodon lineatus, Linn. Syst. Nat. i. p. 411 (1766) ; Forsk. Desor. Anim. p. 76 



(1775) ; Giinth. Petherick's Trav. ii. p. 267 (1869). 

 Tetrodon physa, Geoffr. Descr. Egypte, Poiss. p. 19, pis. i. & ii. (1809) ; Joannis, 



Mag. Zool. 1835, iv. pi. ii. 

 Bon Jerap, Rifaud, Voy. Egypte, pi. cxcix. (1830). 

 Tetrodon strigosus, Bennett, Proc. Zool. Soc. 1834, p. 46. 

 Crayracion fahaka, Steind. Sitzb. Ak. Wien, lxi. i. 1870, p. 572. 



Head as long as broad or a little longer than broad, its Length (to the 

 gill-opening) 3 to 3| times in total length. Snout rounded, twice as 



Fig. 97. 



Tetrodon fahalca. 

 Khartum (F. N.). |. 



long as eye, which is lateral and contained 6 to 7 times in length 

 of head * ; intevorbital region feebly convex, 2 to 2J times in length of 

 head ; no nostril, but two nasal tentacles on each side, measuring about 

 ^ diameter of eye. Dorsal rounded, 12-14. Anal rounded, 10-11, 

 originating below middle of doi'sal. Pectoral rounded-subtruncate, \ to 

 \ length of head. Caudal rounded, as long as or a little longer than 

 head. Caudal peduncle \ to § length of head, \\ to 1^ times as long 

 as deep. Head and body with minute spines, except on snout, round 



* Young specimens have the head and the eye much larger in proportion than tne 

 adult. 



