OF FISHES FEOM LAKE TANGANYIKA. 575 



extending to below anterior fourth of eye ; jaws strong, lips thick; 18 or 20 teeth in 

 the upper jaw, 14 or 16 in the lower ; interocular region scaly, convex ; 3 or 4 series 

 of scales on the cheek ; larger scales on the opercle. 18 to 20 gill-rakers on lower 

 part of anterior arch, the posterior rather elongate. Dorsal XIX-XX 11-13 ; spines 

 rather strong, subequal from the 8th or 9th, f to i length of head ; posterior soft rays 

 longest, f length of head. Anal III 12-13 ; spines very strong, third longest, f to ^ 

 length of head. Pectoral acutely pointed, f to 4- length of head. Ventral not reaching 

 anal. Caudal peduncle once and § to twice as long as deep. Caudal with deep 

 crescentic notch. Scales 75-78 J^; lateral lines ggj; 5 series of scales between the 

 lateral lines anteriorly. Olive-grey above, in the fresh condition, shading to whitish 

 below, with 7 or 8 somewhat irregular, yellowish-brown longitudinal lines; two or 

 three ill-defined dark brown bars across the back and a round spot at the root of the 

 caudal fin sometimes present; a black opercular spot; dorsal and caudal fins brown, 

 with round yellow spots. 



Total length 290 millim. 



The vertebras number 38 (18 + 20). The occipital crest is very strong. 



Mastacembelid^e. 



81. Mastacembelus mookii Blgr. 



Five young specimens, 40 to 70 millim. long, from Utinta, dredged among shells in 

 about 15 fathoms. Native name: Molombo. 

 The dorsal spines number 26 or 27. 



82. Mastacembelus ctoxingtoni, sp. n. (Plate XLI. fig. 3.) 



Depth of body 10 to 11 times in total length, length of head 7 to 1\ times. Vent 

 equally distant from end of snout and from root of caudal fin, its distance from the 

 head equal to 2\ to 2-f times length of latter. Snout 3 to 4 times as long as eye, 

 ending in a trifid appendage which is a little longer than the latter ; cleft of mouth 

 extending to below nostril or not quite so far ; a strong, erectile spine below the nostril ; 

 two strong prseopercular spines. Dorsal XXIX 95-105, spines increasing in length ; 

 anal II 115-125, second spine equal to penultimate dorsal; both fins completely 

 embracing the rounded caudal ; the distance between the first dorsal spine and the head 

 3 to %\ times in length of latter. Pectoral twice and \ to 3 times in length of head. 

 Scales very small, 26 to 28 between origin of soft dorsal and lateral line. Uniform 

 brown above, or olive-brown mottled with darker, white beneath ; caudal blackish, 

 edged with orange. 



Total length 580 millim. 



Two specimens from Kituta, native name Morobe, and one from Kazzaga, native 

 name MoU/mbo. 



