OF FISHES FEOM LAKES TANGANYIKA AND KIVU. 159 



ASPROTILAPIA. 

 Bouleng. Ami. & Mag. N. H. (7) vii. 1901, p. 5. 



Teeth small, tricuspid, closely set, in two series in both jaws. Mouth inferior, 

 transverse; greater part of maxillary bone concealed under the prseorbital. Body 

 elongate, much attenuate in the caudal region. Scales ctenoid; two lateral lines. 

 Dorsal with 14 spines, anal with 3. 



Allied to Tilapia. By the form of the body, the type of this genus recalls Aspro 

 among the Perddce. 



47. AsPEOTiLAPiA LBPTURA. (Plate XX. figs. 2, 2a, 2h.) 

 Bouleng. /. c. 



Body rather feebly compressed, its depth 5 times in total length ; length of head 

 4 times in total length. Snout subconical, strongly projecting beyond the mouth, its 

 length -J that of the head ; eye very large, its diameter equal to length of snout and 

 nearly twice interorbital width, 2f times in length of head ; width of mouth f that of 

 head ; 36 teeth in the outer row of the upper jaw ; 3 series of small scales on the 

 cheek ; larger scales on the opercle. Gill-rakers very short, tubercle-like, 15 on lower 

 part of anterior arch. Dorsal XIV 12 ; spines slender and subequal, f length of head ; 

 soft rays a little longer. Pectoral pointed, a little shorter than head. Ventral reaching 

 vent. Anal III 8 ; third spine nearly as long as dorsals. Caudal deeply emarginate, 

 crescentic. Caudal peduncle 3 times as long as deep. Scales strongly denticulate, 



38 j^ ; lat. I. 20- Brown, darker on the snout and vertex ; a blackish opercular spot ; 

 fins greyish. 



Total length 95 millim. 



A single specimen from Msambu. 



48. Xenocheomis hecqui Blgr. 



Three specimens from Usambura. Grows to a length of 270 millim. D. XVI-XVII 

 10-11; A. Ill 9-10; Sq. 64-67 ^; lat. 1. g^i- 



Mastacembelid.iE. 



49. Mastacbmbelus feenatus. (Plate XX. fig. 3.) 

 Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 5. 



Depth of body 13 times in total length, length of head 8f times. Vent equally 

 distant from end of snout and from caudal fin, separated from head by a space equal 

 to 3f times length of latter. Snout 3 times length of eye, produced into a trifid 

 appendage, the length of which exceeds a little diameter of eye ; buccal cleft extending 

 to below anterior border of eye ; no prseopercular spines. Dorsal and anal confluent 



