446 CICHLID.E. 



4 series of scales on the cheek. Gill-rakers short, 10 on lower part of 

 anterior arch. Dorsal XV-XVI 11 ; spines rather feeble, increasing 

 in length to the last, which measures nearly i length of head ; longest 

 soft rays as long as head. Anal III-IV 8-9 ; last spine shorter than 

 last dorsal. Pectoral as long as or a little longer than head, extending 

 to vertical of origin of anal, or not quite so far. Ventral as long as or 

 longer than head. Caudal densely scaled, deeply notched. Caudal 

 peduncle a little longer than deep. Scales very finely, sometimes rather 

 indistinctly denticulate, 33-36 yi' lateral lines 1^3^. Brown or blue- 

 black ; tail edged with orange in life. 



Total length 185 millim. 



Lake Nyassa. 



1. Type. L. Nyassa. Prof. J. E. S. Moore (C). 



2. Ad. „ Capt. E. L. Rhoades (P.). 



20. ECTODUS. 



Bouleng. Tr. Zool. See. xv. 1898, p. 21, and Poiss. Bass. Congo, p. 437 (1901) ; 

 Pellegr. Mem. See. Zool. France, xvi. 1904, p. 367 (part.). 



Body moderately elongate ; scales ctenoid ; two incomplete lateral 

 lines. Teeth small, conical, in two or three series, those of the outer 

 sei'ies in the lower jaw directed outwards, perpendicular to the innei*. 

 Maxillary entirely folding under the pr?eorbital. A large papillose pad 

 on each side of the pharynx, forming a strong protuberance in front of 

 the upper part of the branchial arches. Dorsal with 13 or 14 spines, 

 anal with 3. Occipital and parietal crests low, extending to between 

 the orbits. Vertebrte 36 (17 + 19). 



Lake Tanganyika. 



Connected with Pelmatochromis throiigh P. macro])s, P. stappersii, 

 and P. pleurosinlus. 



1. ECTODUS DESCAMPSII. 

 Bouleng. Tr. Zool. Soc. xv. 1898, p. 21, fig., 1899, p. 90, pi. xix. fig. 2, Ann. Mus. 

 Congo, Zool. i. p. 144, pi. liv. fig. 2 (1900), and Poiss. Bass. Congo, p. 438 

 (1901) ; Pellegr. Mem. Soc. Zool. France, xvi. 1904, p. 367 ; Bouleng. Tr. 

 Zool. Soc. xvii. 1906, p. 568. 



Depth of body 3^ to 3f times in total length, length of head 3 times. 

 Head twice as long as broad, with curved upper profile ; snout rounded, 

 as long as broad or a little broader than long, shorter than eye, which 



