28 ON FISHES FROM SOUTHERN CAMEROON, [Jan. 20, . 
CICHLIDA. 
31. PELMATOCHROMIS BATESII Bler. 
Recently deseribed from the Benito River. 
32. PELMATOCHROMIS SUBOCELLATUS Gthr. 
33. TILAPrA LATA Gthr. 
MASTACEMBELIDE. 
34, MASTACEMBELUS LOENNBERGII Bler. 
28 dorsal spines. Length of head 33 times in its distance from 
vent, 
35. MASTACEMBELUS SCLATERI, sp. n. (Plate V. fig. 2.) 
Depth of body 12 to 13 times in total length, length of head 
(without rostral appendage) 6 to 7 times; vent equally or nearly 
equally distant from end of snout and base of caudal; length of 
head 24 to 2? times in its distance from vent, and 4 to ? im its 
distance from first dorsal spine. Snout 3 times as long as eye, 
ending in a trifid dermal appendage which is longer than eye; 
cleft of mouth extending hardly to below nostril; a strong pre- 
orbital and two strong preopercular spines. Vertical fins united 
with rounded caudal. Dorsal XXVI-XXVII 85-90; spines 
very short, Anal If 80-90. Pectoral not quite 3 length of head. 
Seales very small, 19 or 20 between origin of soft dorsal and 
lateral line. Olive-brown, whitish on the belly; a dark band on 
each side of the head, passing through the eye, sometimes 
continued on the anterior part of the body; a more or less 
distinct series of large, dark, light-edged ocelli along the base of 
the dorsal. 
Total length 225 millim. 
This new species, named after our retiring Secretary, Mr. P. L. 
Sclater, in recognition of many favours received from him during 
his tenure of office, is based on four specimens from the Mvile 
River. J/. sclateri differs from I. marchii Sauv. in the more 
numerous dorsal spines, from JZ. eryptacanthus Gthr., liberiensis 
Blgr., and loennbergi Blgr. in the larger head, and from JM. con- 
gicus Blgr. in the presence of only two anal spines and the still 
smaller scales. 
EXPLANATION OF THE PLATES. 
Puate I. 
Fig. 1. Alestes intermedius, p. 22, natural size. 
2. Alestes opisthotenia, p. 22, 3. 
3. Amphilius longirostris, p. 25, natural size. 
3a. # Z Upper view of head and pectoral fin, x 13. 
35. ss 33 Lower view of head, X 1}. 
Prats II. 
Fig. 1. Labeo annectens, p. 23, +. 
2. Barbus teniurus, p. 24, natural size. 
