BATHTBATES. 437 



spines, anal with 3 ; 14 to 18 soft rays in the anal. Occipital and 

 parietal crests strong, not extending forward to beyond posterior part 

 of interorbital region. Vertebras 35-36 *. 

 Lake Tanganyika. 



Synopsis of the Species. 



I. Spinous dorsal not notched, the posterior spines subequal ; 3 to 5 series oE 

 teeth in the upper jaw, 3 in the lower. 



A. Interocular width less than diameter of eye. 

 D. XV-XVI 11-12; A. Ill 14 j Sc. 65-75^; 



12-13 gill-rakers on lower part of anterior 



arch 1.5. graueri, Stdr., p. 437. 



D. XIV-XV 15-16 ; A. Ill 16-17 ; Sc. 78-100 



7—8 

 „, .,„ ; 13-15 gill-rakers 2. B. ferox, Blgr., p. 438. 



D. XIV 14; A. Ill 17 ; Sc. 85 g ; 9 gill-rakers . 3. 5. horni, Stdr., p. 440. 



B. Interocular width at least equal to diameter of eye. 

 D. XV 14; A. Ill 14-15; Sc. 120-125 -^-; 



12-13 gill-rakers 4. 5. vittatus, Blgr., p. 440. 



D. XVI-XVII 16-17 ; A. Ill 17-18 ; Sc. 140-150 



or.ua i 16-19 gill- rakers 5. 12. fasciatus, Blgr., p. 441. 



II. Spinous dorsal notched, the last spine twice as long as the penultimate ; 

 2 or 3 series of teeth in the upper jaw, 2 in the lower. 

 D. XIII 15-16; A. Ill 16-17 ; Sc. 90-95 ^ ; 



11-12 gill-rakers G. B. minor, Blgr., p. 442. 



1. BATHYBATES GRAUERI. 

 Steind. Sitzb. Ak. Wien, cxx. i. 1911, p. 1171, pi. i. 



Depth of body 3^ to 3| times in total length, length of head 2h times. 

 Snout longer than postocular part of head ; lower jaw projecting ; eye 

 If to If times in length of snout, 3§ to 4 times in length of head, nearly 

 twice interorbital width ; mouth not extending to below anterior border 

 of eye; 4 series of teeth in the upper jaw; 7 series of scales on the 

 cheek. 12 or 13 gill-rakers on lower part of anterior arch. Dorsal 

 XV-XVI 11-12; spines subequal, f length of head ; longest soft rays 

 |- length of head. Anal III 14 ; spines slender, third as long as dorsals. 

 Pectoral about § length of head, extending to vertical of origin of anal. 



* 16-17+19 = 35-36 in B. ferox, 16 + 20 = 36 in B. minor. 



