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Dr. J. E. Gray on the Species of Hyrax. 51 
It has the alveoli of the upper cutting-teeth each raised into a 
cup round the base of the tooth; but this may be only an 
individual peculiarity. 
This skull has all the characters of the genus Dendro- 
hyrax, except that the orbit is incomplete behind. I think 
that it indicates a new group, to which the name Heterohyrax 
may be given. The skull is much smaller and the tooth-line 
much shorter than in D. dorsalis; and I propose to name it 
ly Heterohyrax Blainvillit. The skull which M. de 
lainville figures as that of Hyrax rufipes (Ostéograph. t. 2) 
exactly represents the hinder part of that in the Museum. It 
cannot be the H. ruficeps of Ehrenberg. 
Dr. G. v. Jaeger figured, under the name of Hyrax habessi- 
nicus (t. 2. f. 14), the upper part of the skull of a Dendrohyrax 
obtained from Gondar by Dr. von Heuglin. Dr. Jaeger, by 
mistake, figures the upper edge of the occipital for the inter- 
arietal. ‘This skull is interesting as showing that the genus 
is found in Abyssinia. 
- Dr. G. v. Jaeger also figures the back of the skull and inter- 
arietal bone of a species he calls Hyraz silvestris, collected 
in West Africa by the missionary Dieterle. It is probably a 
Dendrohyrax. The hinder part of the figure is the upper edge 
of the occipital. The interparietal is urn-shaped, broader in 
front and contracted behind, very unlike that found in the 
skulls of either of the two species in the British Museum, and 
especially differing from D. dorsalis.of West Africa; so it may 
be a new species of the genus, Dendrohyrax silvestris (Wiirzb. 
naturw. Jahresb, xvi. p. 162, t. 2. f. 15). 
The Measurements of the Skulls, in inches and lines. 
2 (2 2/ 2i z|. |3 
“ss S s = ~ = 
2 |3 7 is] 2/8 = |$5\8 |B 
Bu | 83] es] esl ay] ee |Es| = | g>|2< [Esl Es | Es] Ss 
88/38 |e | isis] ga jal & | x |'4/$8/83/Ss) as 
oS]. t | Ste pas > | Se it x > | io ot -&~ -& 
BN i | Im ie IR TR Re TR IR IA IA IA 
Length of skull ...... [40/37/36 |36 |32 /211 |...... 32|2 73/22/40 |3 4|21|3 4 
_»  tooth-line, {16 |1 42/16 [16 |14 |1 2 |... aCe eed eee a oe og Ee 1 22 
Width, at centre of 
_ #¥goma, of fore >| 2 23/2 0}/203/21 19 |1 8$/18 |20 1 7 |1 3 |23 /110|1 2/1 
ee endofl iy 7 j16 416 |16 (18 {rt 3 |1 28/16 {1 2 |10 |19-|1 63/1 0/1 5} 
Width of band at 
|} middle of crown }}0 3. |0 2 [0 03/06 |06 |o 7 |o 6\98 | ...... |... 09 {1 Ol... 0 10 
| ___over condyles ... 
‘idth of nose......... 07/07 |08 |07 |06 |o 52/07 jo 610 6 105 |08i|/0 7/0 5/0 7 
_ » _ at outer edge 
: of tooth-line, at 13 |12 |14 {12 {21 /1 03/10 [1 08/0 fos}09 {1 23/1 O}...... 0 112 
eee peat Ott | 0 78.0 72 08 |07 |06 |0 7 '0 62/0 6310 6 |...... 09 jo 8 ore 0 6 
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