154 ME. G. A. BOULENGEK ON A COLLECTION 



fi little more than ^ length of head. Pectoral pointed, fhlciform, at least as long as 

 head. Ventral reaching vent, the outer ray produced into a filament. Anal III 8 ; 

 third spine much stronger than dorsal spines, nearly ^ length of head. Caudal 

 rather deeply emarginate. Caudal peduncle a little longer than deep. Scales with 



'■'''^ 25-31 



denticulate border, 55-58 JL; lat. 1. 47:43, the upper extending to below the last spines 



18 



or the first soft rays of the dorsal, the lower originating a little behind the shoulder 

 and extending to the caudal fin. Body golden, olive on the back ; purplish streaks 

 along the dorsal and caudal fins, sometimes forming a wide-meshed network. 



Total length 300 millini. 



This species was discovered almost simultaneously by Mr. Moore at Kinyamkolo and 

 Kibwesi, and by Capt. Hecq, of the Congo Free State, at Albertville. 



The genus Pelmatochromis had not yet been recorded from Lake Tanganyika. 

 P. folyU'pis is very closely allied to P. lateralis Blgr., from the Congo ; it diff'ers in 

 its much smaller scales. 



31. EcTODUS LONGiANALis Blgr. (Plate XIX. fig. 4.) 



Several specimens from the north end of Lake Tanganyika, near Usambura. 



The females, measuring 95 millim., contain ripe ova, the diameter of which is 

 2 millim. In the adult male (115 millim.) the upper surface of the snout, the chin, 

 the middle of the throat, the dorsal and anal fins, and the extremity of the ventrals are 

 black ; a few large, black, white-edged ocelli on the spinous dorsal, along which runs 

 a white line, which is also present on the soft dorsal and on the anal ; oblique white 

 lines on the soft dorsal ; large, round, white spots on the ventrals ^ ; two crescentic 

 bands on the caudal, the first grey, the second, marginal, blackish. 



The specimens brought home by Mr. Moore have enabled me to make an examina- 

 tion of the skeleton, which differs very considerably from that of Paratilapia. Three 

 very low crests, supra-occipital and parietal, extend forwards to between the orbits. 

 The precaudal vertebrae are much fewer than the caudals, 14 of the former as against 

 24 of the latter, a character, quite exceptional among the Cichlidce, shared by the 

 genera XenotUapia and Trematocara ; the ribs are inserted on the parapophyses, the 

 last pair of which form a hgeraal arch. 



32. Xenotilapia oenatipinnis. (Plate XVIII. fig. 2.) 

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



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

 quite similar to that of X. sima. 15 to 17 gill-rakers on lower part of anterior arch. 

 Dorsal XIII-XV 12-13 ; spines subequal from the 5th or 6th, f length of head. 



' Li this geuus the inner rays of the ventral are the longest. 



