1864. ] COLLECTED BY DR. KIRK ON THE ZAMBESI. 313 
spines of moderate length and strength ; the dorsal rays extend to the 
root of the caudal, when laid backwards. Caudal fin with an oblique 
truncated margin behind, and with scarcely any scales; ventral 
rather longer than pectoral, extending to the vent. 
Head and upper parts brownish ; operculum with a black spot 
behind ; a dark band runs from the opercular spot to the root of the 
caudal ; another band, parallel to the former, and indistinct, runs 
along the side of the belly. The soft dorsal and caudal fins with 
small round dark spots. 
A specimen 12 inches long, from Lake Nyassa, is in the collection. 
HEMICHROMIS LONGICEPS. 
D. Z. As >. L. lat. 40.  L. transv. 3/11. 
Head and body elongate, as in Cheilio; the height of the body is 
one-fourth of the total length (without caudal), the length of the 
head more than one-third. Snout elongate, longer than the post- 
orbital portion of the head. Teeth small, rather widely set, in two 
series in the upper jaw as well as in the lower, those of the outer 
series being larger than the very small ones of the inner; the teeth 
in the upper jaw gradually decrease in length posteriorly. The 
lower jaw projects a little beyond the upper, and the maxillary ter- 
minates midway between the extremity of the snout and the front 
margin of the orbit. Przeorbital bone much wider than the orbit. 
The naked preopercular limb is as wide as the scaly part of the 
cheek, the scales being arranged in three series. The lower part of 
the lateral line extends forwards to below the posterior dorsal spines, 
or even still further. The dorsal fin commences above the root of 
the pectoral fin ; its spinous portion is low, formed by feeble spines, 
the middle being equal in length to the diameter of the eye; the 
soft portion is more elevated, but the rays, if laid backwards, do not 
extend to the caudal fin. The third anal spine is longer and stronger 
than any of the dorsal spines. Caudal fin slightly emarginate, with 
the lobes angular, and with the basal portion scaly. Pectoral and 
ventral rather elongate, the latter extending nearly to the vent. 
Upper parts dark green; sides and belly silvery ; operculum with 
a deep-black spot behind. 
The skins of two specimens from Lake Nyassa have been pre- 
served ; the larger is 95 inches long ; the natives called it ‘‘ Sangwe.” 
HEMICHROMIS DIMIDIATUS. 
D. is. A. = L. lat. 33. LL. transv. 4/11. 
Similar to Hemichromis longiceps ; the height of the body is one- 
fourth of the total length (without caudal), the length of the head 
one-third. Snout pointed, elongate, longer than the postorbital por- 
tion of the head. Dentition and mouth as in H. longiceps. Pre- 
orbital bone much wider than the orbit. The naked preeopercular 
limb is much narrower than the scaly part of the cheek, the scales 
being arranged in four series. Dorsal spines rather feeble, of mode- 
