314 PROF. HUXLEY ON ARCTOCEBUS CALABARENSIS. [June 28, 
rate length, the middle being longer than the diameter of the eye ; 
the soft rays terminate at some distance from the root of the caudal, 
if laid backwards. The third anal spine is stronger, but not longer, 
than the posterior dorsal spines. Caudal fin slightly emarginate, 
with the lobes angular, the upper being somewhat the longer: two- 
thirds of it are scaly. Ventral longer than the pectoral. A narrow 
black band runs from the upper part of the gill-opening along the 
middle of the side to a blackish spot on the root of the caudal, di- 
viding the body into two equal halves. 
The skin of a single example, 9 inches long, from Lake Nyassa, 
has been preserved. 
PELOTROPHUS (g. n. CYPRINIDARUM). 
Distinguished from Leuciseus by the form of the anal fin, the an- 
terior part of which is much elevated ; whilst the posterior is very 
low, both parts being abruptly divided, &c. 
PELOTROPHUS MICROLEPIS. 
D.13. A.19. L. lat. 88. L. transv. 14/6. 
The maxillary extends nearly to below the posterior margin of the 
eye. The last dorsal ray is vertically above the origin of the anal 
fin. The last six anal rays are short—only half as long as the ray 
preceding them. Bright silvery. 
The skin of asingle specimen from Lake Nyassa is 20 inches long. 
PELOTROPHUS MICROCEPHALUS. 
D.13. A.19. L. lat. 47. L. transv. 9/3. 
The length of the head is contained five times and a half in the 
total (without caudal); the maxillary extends somewhat behind the 
vertical from the centre of the eye. The last dorsal ray is vertically 
above the anterior anal rays. The last six anal rays very short. 
Brownish above, silvery on the sides. 
The skin of a single specimen from Lake Nyassa is 15 inches long. 
8. On THE ANGWANTIBO (ARCTOCEBUS CALABARENSIS, GRAY) 
or Otp CauaBar. By T. H. Huxtey, F.R.S., V.P.Z.S. 
(Plate XXVIII.) : 
On the 25th of April 1860, Dr. John Alexander Smith read before 
the Royal Physical Society of Edinburgh a “ Notice of the ‘ Ang- 
wantibo’ of Old Calabar, Africa—an animal belonging to the family 
Lemurina, and apparently to the genus Perodicticus of Bennett.” 
The specimen from which this notice was drawn up was sent home 
by the Rev. Alexander Robb, who, in a letter dated July 28th, 1860, 
which is quoted by Dr. Smith, says, ‘Another specimen which I 
procured I handed to Mr. Thomson, who, I believe, sent it to Mr. 
Murray.” 
