320 PROCEEDINGS OF METROPOLITAN SOCIETIES. 
and send a male and female Chimpanzee, which were numerous in 
the interior ; but that, on account of the superstitious feeling which 
the inhabitants entertained towards the Hippipotamus, he had rea- 
son to fear that his endeavours would prove unsuccessful to transmit 
a living specimen of that animal, which was also of common occur- 
rence. Mr. Waterhouse then exhibited specimens and numerous 
crania of two species of Galxopithecus, which he was unaware had 
previously been described, though Professor Temminck appears to 
have alluded to them in his statement that two species existed of 
this genus, which were well characterized by osteological distinc. 
tions. The majority of authors, following M. Geoffroy, had denot- 
ed three species, distinguished by colour only, which, in both of 
those now exhibited, was extremely variable, and consequently of 
no value whatever as a means of discrimination. He proposed to 
name them G. Temminckii and G. Phillipinensis. The former was 
of superior linear dimensions, but with smaller hands, and also 
ears: its teeth were separated by intervals, and the parietal ridges 
of the cranium were widely apart. The latter was a stronger- 
formed animal, the teeth of which were much stouter and more 
approximated, and the parietal ridges almost contiguous, thus allow- 
ing more extended space for the muscles which moved the jaw ; its 
muzzle also was more obtuse and rounded, and the conformation of 
the lower jaw strikingly different. Mr. Blyth next read a paper on 
the dental system of the Lemuride, in which he showed that the 
reputed outer pair of lower incisors of that group of animals were 
the representatives of the inferior canines of other Quadrumana, no 
member of that order possessing more than four incisive teeth to 
either jaw. This might easily be seen by opposing the successive 
teeth of both jaws, beginning with the most hindward ; or it might 
be ascertained by what was asserted to be an universal law through- 
out the class, that the inferior canines closed or locked outside or 
before the upper ones: the first false molar, in the Lemurs, assum- 
ing the form of a canine, as happens in some other instances. In 
the genera Tarsius and Nycticebus, it was stated that the true in- 
ferior canine assumed more of its ordinary form and dimensions ; 
while in microcebus, and the nearly allied Cheirogaleus ( Lichanso 
of Gray), the first false molar scarcely differed from the next. In 
Galwopithecus the superior canines are altogether wanting ; and 
this curious genus further differ from all other Quadrumana in the 
incompleteness of its bony orbits. It has four incisors to each jaw, 
the medial of which are separated by a very wide interval ; this in- 
terval is lessened, in the majority of Lemuride, in proportion as the 
inferior canines approximate, the latter being directed horizontally 
forwards, like the intervening incisors, which, in consequence of the 
approximation of the canines, are extremely narrow or compressed, 
the lower incisors and canines together being admitted within the 
interspace of the upper jaw. In Propithecus of Mr. Bennett, and 
the Indris (Lichanotus), the inferior canines are so approximate 
that one pair of the lower incisors is necessarily sacrificed, which the 
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