CLAEIAS. 279 



Prof. Flinders Petrie, on which I recognise a Clarias, In the animal-cemetery of 

 Medinet Gurob, on the border of the province of the Fayum, explored by Mr. Loat in 

 1903 *, a large specimen of Clarias lazera was found among other buried fishes. 



Synopsis of the Species. 



I. Ventral fins midway between the end of the snout and the root of the caudal fin, or a little 



nearer the former ; maxillary barbel not or but little longer than the head (measured to the 

 extremity of the occipital process) except in the very young ; nasal barbel shorter than 

 the head ; distance between dorsal fin and occipital process four to seven times in length 

 of head. 



A. Head granulate above (except in the very young) ; Dorsal 62-82, Anal 50-65. 



1. Vomerine teeth mostly pointed, forming a band which is not broader than the band of 



prsemaxillary teeth. 



20-27 gill-rakers on anterior arch ; distance between dorsal and caudal 

 fins one to two and a half diameters of eye; clavicles hidden under 

 the skin 1. C. angiiillaris, L. 



87 gill-rakers on anterior arch ; distance between dorsal and caudal fins 

 three diameters of eye ; clavicles striated, distinct under the thin 

 skin 2. C. moorii, Blgr. 



2. Vomerine teeth all or mostly granular. 



Band of vomerine teeth not more than once and a half the width of the 



prsemaxillary band ; 25 (young) to 110 gill-rakers on anterior arch ; 



distance between dorsal and caudal fins at least equal to diameter of 



eye ; clavicles hidden under the skin 3. C. robecchii Vinci o*. 



Band of vomerine teeth measuring once and one-third to twice and a half 



the width of the preemaxillary band ; 35 (young) to 135 gill-rakers 



on anterior arch ; distance between dorsal and caudal fins not greater 



than diameter of eye ; clavicles striated or granulated, more or less 



distinct under the thin skin 4. (7. lazera C. & V. 



B. Head smooth above ; vomerine teeth granular, forming a band 



which is not broader than the prfemaxillary band ; Dorsal 78-85, 

 Anal 60-70 ; 45-70 gill-rakers on anterior arch ; distance 

 between dorsal and caudal fins not greater than diameter of eye . 5. C. tsanensis Blgr. 



II. Ventral fins once and one-third to once and three-fourths as distant from the root of the 



caudal fin as from the end of snout. 

 A. Maxillary and nasal barbels shorter than head ; Dorsal 65-78, 

 Anal 57-64 ; distance between dorsal fin and occipital process 

 once and two-thirds to twice and a half in length of head ; gill- 

 rakers 10 or 11 on anterior arch 6. C. carsonii, Blgr. 



Loat, ' G-urob, Egyptian Besearch Account/ x. 1904, p. 6. 



