142 MK. G. A. BOTTLENGER OK THE AFRICAN AND [Feb. 7, 



17. Perissodus Blgr. 

 Tr. Z. S. XV. p. 20. 



1. Perissodus miceolepis Blgr. 



Tr. Z. S. XV. p. 21. 

 Lake Tanganyika. 



18. Plecodus Blgr. 

 Tr. Z. S. XV. p. 22 



1. Plecodus paradoxus Blgr. 



Tr. Z. S. XV. p. 22. 

 Lake Tanganyika. 



19. Paretroplus. 



Paretroplus, Bleak. Versl. Ak. Amsterd. ii. 1868, p. 311 ; Sauvage, 

 Hist. Madag., Poiss. p. 445 (1891). 



Body short ; scales cycloid. Teeth rather large, with blunt 

 crowns, forming a single series ; one or two more or less enlarged 

 teeth 6n each side at the symphysis of either jaw. Maxillary exposed. 

 Dorsal with 16 to 20 spines, anal with 8 to 10 ; the spines folding 

 in a scaly basal sheath. Vertebrae 34 (17 + 17). 



Madagascar. Two species. 



1. Paretroplus dami. 



Paretroplus cZamu, Bleek. 1. c. p. 313; Bleek. & Pollen, Poiss. 

 Madag. p. 13, pi. iv. fig. 3 (1874) ; Sauvage, Hist. Madag., Poiss. 

 p. 446, pi. xlvi. fig. 1 (1891). 



Depth of body twice in total length, length of head 3 times. 

 Snout strongly compressed, twice as long as the eye in the adult ; 

 diameter of eye 4| times in length of head, Ig in interorbital 

 width ; maxillary extending to between nostril and eye ; 4 series 

 of scales on the cheek ; larger scales on the opercle. Gill-rakers 

 short, 12 on lower part of anterior arch. Dorsal XYIII-XX 11- 

 14 ; last spine longest, f length of head, shorter than soft rays. 

 Pectoral obtusely pointed, not quite f length of head. Anal 

 IX-X 9-11 ; last spine slightly longer than longest dorsal. 

 Caudal feebly emarginate. Caudal peduncle twice as long as deep. 

 Scales 35 °^ ; lat. 1. ;||; lower lateral line reduced to a few tubules, 

 not extending to the root of the caudal. Uniform dark brown ; a 

 round blackish spot above the axil ; pectoral yellowish. 



Total length 170 miUim. 



Madagascar. 



2. Paretroplus poltactis. 



Paretroplus polyactis, Bleek. Versl. Ak. Amsterd. xii. 1878, 

 p. 195, pi. iii. fig. 1 ; Sauv. Hist. Madag., Poiss. p. 446, pis. xliv a. 

 fig. 7 & xliv B. fig. 2 (1891). 



Paretroplus damii (non Bleek.), Steiiid. Sitzb. Ak. Wien, kxxii. 

 i. 1880, p. 247. 



Closely allied to the preceding. Depth of body 1| to 2 in total 



