152 ME. G. A. BOULENGER ON A COLLECTION 



contained 2f to 3 times in total length. Profile of snout descending in a straight or 

 slightly convex line ; lower jaw projecting beyond the upper ; diameter of eye nearly 

 equal to length of snout or interocular width, 3^ to ^ times in length of head ; 

 maxillary not extending to below anterior border of eye ; teeth small, in 2 or 3 rows, 

 the outer very slightly larger than the others ; 2 series of scales on the cheek ; very 

 thin scales on the opercle. Gill-rakers rather long and closely set, 19 to 23 on lower 

 part of anterior arch. Dorsal XV 13 ; last spine longest, f length of head ; soft rays 

 longer, sometimes produced into filaments. Pectoral pointed, a little shorter than 

 head. Ventral reaching vent. Anal III 12-13 ; third spine longest, a little stronger 

 but shorter than last dorsal spine. Caudal deeply emarginate. Caudal peduncle nearly 



6 54-58 



twice as long as deep. Scales without marginal denticulation, 60-68 jg ; lat. 1. giisj- 

 Brownish above, silvery beneath, with or without blackish spots and longitudinal bands ; 

 dorsal blackish at the end. 



Total length 220 millim. 



Several specimens from Maswa and from the south end of Lake Tanganyika. 



26. Paeatilapia leptosoma Blgr. 

 Msambu. 



27. Paeatilapia nigeipinnis. (Plate XIX. fig. 1.) 

 Bouleng. Ann. & Mag. N. H. (7) vii. 1901, p. 3. 



Depth of body 4 times in total length, length of head 3 to 3j times. Snout with 

 straight upper profile, as long as diameter of eye, which equals interocular width and 

 is contained 3^ times in length of head ; mouth extremely protractile ; maxillary 

 extending to below anterior border of eye ; teeth very small, in 3 rows ; 2 or 3 series 

 of scales on the cheek ; opercle covered with scales. Gill-rakers long and thin, 

 closely set, 20 on lower part of anterior arch. Dorsal XV-XVII 11 ; spines increasing 

 in length to the last, which measures f length of head ; soft rays longer. Pectoral 

 pointed, as long as head. Ventral reaching origin of anal or beyond. Anal III 8-9 ; 

 third spine as long as the last dorsal. Caudal deeply emarginate, the lobes produced 

 into filaments. Caudal peduncle twice as long as deep. Scales with denticulate 



o 29—30 



border, 39-40 jy ; lat. 1. jgrre- Dark brown, lighter beneath ; fins blackish, the caudal 

 edged with white above and beneath. 



Total length 80 millim. 



Several specimens from Msambu. 



This species is very closely allied to the preceding, but is distinguished by the 

 number of rays in the dorsal and anal fin (D. XV-XVII 11, A. Ill 8-9, instead of 

 D. XII-XIV 14-16, A. in 10-12). 



