PETROCEPIIALUS. s 47 



2. PETROCEPHALUS. 

 PefrorepJidht.'i, ])arf., Marcuscn, 15nll. Ac. 8t. I'rtcrsI). xii. 1851, p. M, and IMeni. 



Ac. St. Pctcrsl). (7) vii. I.SiM, no. 4, p. J II. 

 J/ormi/riis, pirt., (Jiiiitli. Cat. Fish, vi, p. 214 (ISGfi). 

 Fetrorephalus, Gill, Proc. Ac. Philad. 18G2, p. 443 ; Boulennr, Proc. Zool, Soe. 



1S;1S, p. 787, Poiss. Bass. C,)n.^ro, p. 70 (L'JOl), an 1 Fish. Nile, p. .'52 (i;)07). 



'Jeetli iu^ the jaws l)icusi)id, forming a single complete series on the 

 entire edge of both jaws (10-26 upper and 16-35 lower); minute 

 conical teeth on the parasphenoid and on the tongue ; mouth inferior, 

 sitnated below the eyes. Nostrils close together, close to the eye. Body 

 short; ventral fins nearer the j)ectorals than the anal. Dorsal and anal 

 fins usually not very unecpial in length. Vertebrec 42-14 (D-12-|-4-6 

 + 27-29). 



Nile and Tropical Africa. 



8i/)iojjsh of the Species. 



I. Anal originatini;- more or less in advance of dorsal, wliicli has at least 2U rays. 

 A. Diameter of eye greater than length of snout. 



1. D. 2^-^?> : A. :U-39 ; L. 1. aU-50. 

 Diameter of eye §-f; interorhital width; teeth .^-,-^^ ; 



10-12 scales round caudal peduncle . . . I. P. bane, Laccp., p. 48. 



Diameter of eye ecpial to interorhital width ; 



teeth ,-, " ' ; 12 scales rouml caudal peduncle . 2. P. sanva<jii^ Blgr., p. 49. 

 -o-oO jii 



Diameter of eye li interorhital width ; t(M'th . ; 



8 scales round caudal peduncle ?>. P. ansoruii, Blgr.^ p. ,')!. 



2. D. 20-28. 



a. 10-12 scales round caudal peduncle. 



a. I'ase of dorsal at least as long as its distance from caudal. 

 D. 21-25 ; A. 28-30 ; L. 1. 35-37 ; 10-18 



scales between D. & A. ; teeth ^,£^ ... 4. /'. hullai/i, Sauv., p. 52. 

 D. 24-28; A. 30-34 ; L. 1. 38-45; 21-26 scales 



beiween D. & A. ; teeth j^V^^^ 5. P. fiiinns, Sauv., p. 53. 



/3. Base of dorsal shorter than its distance from caudal; teeth jo o'.. 



D. 22-2(5 ; A. 30-35; L. 1. 38-43 (». P. hovei, C. & V., p. 54. 



D. 25 ; A. 38-311 ; L. 1. 41-44 7. P. keatingil, Blgr., p. 55. 



I). •iO--J2 ; A. 2;)--l\^ \ L. 1. ;'..")-38 8. P. 5^////??ia?m/, Blgr., p. 56. 



/'. 16 scales round caudal peduncle. 

 D. 20-22 ; A. 25-20 ; L. 1. 37-40 ; teeth ^^^ . 9. P. ratostoma, Gtlir., p. 57. 



