I 



35. HTDEOCTON. 351 



1. Hydrocyon forskalii. 



Kelb el bahr ; Kelb el moyeh. 



Uiaracinus dentex, Geoffr. Descr. Ey. Poiss. pi. 4 fig- 1 

 Hydrocyou forskalii Ctiv. Mem. Mm. v. p. 364. pi. 28.fi^. 1 ; Mlill 



txIC-^ sot''' ^'^' '■ P- ^^- *''^- ^- ^^- ^ (^'"^^^ ' ^'"'^- "^ ^ «^- 



B.4. D.IO. A. 15-16. V.IO. L. lat. 45-48. L. transv. 5i2 



The height of the body is contained four times and a half or four 

 times and two-thu-ds in the total length (without caudal), the length 

 of the head four times and one-fourth or four times and two-thirds 

 Ihere are two series of scales between the lateral Hne and the elon- 

 gate scale at the root of the ventral fin. The upper jaw with five 

 or six teeth on each side, the lower with four. Silvery ; generaUy a 

 blackish streak along each series of scales above the lateral Una 



JNile. West Africa. 



a-c. Adult and half-grown. Lower Nile. From Consul Petherick's 

 Collection. 



c7 Half-grown. Egypt. From Dr. E. Riippell's CoUection. 



e-h. bme specimens. Chartoum. From Consul Petherick's Col- 

 lection. 



i. Adult : stuffed. Old Collection. 



k. Adult: skeleton. Lower Nile. From Mr. S. S. Allen's Collection. 



2, Hydrocyon brevis. 



B.4. D.IO. A. 16. V.IO. L. lat. 49-50. L. transv. 9/5. 



Very simUar to R. forskalii, but with a shorter body and with 

 more scales below the lateral hne. 



The height of the body is contained thrice and a half or thrice 

 and two-thirds in the total length (without caudal), the length of 

 the head four times or thrice and four-fifths. There are three series 

 of scales between the lateral line and the elongate scale at the root 

 of the ventral fin. The upper jaw wdth five or six teeth on each 

 side, the lower with four. Silvery ; each series of scales above the 

 lateral line with a very faint darker longitudinal streak. 



Upper Nile. 



a-c. Fine specimens, from 12 to 14 inches long. Chartoum. From 

 Consul Petherick's Collection. 

 Valenciennes appears to have known this species, although he did 

 not distinguish it from If. forskalii ; from his remarks it would 

 appear that it extends also to Western Africa. 



