ANATOMY OF THE LEMUROIDEA. 89 
side of the flexor of the index, and another having origin from between the bones of 
the third and fourth metatarsal, and going to the tibial side of the fifth digit. 
The Thick-tailed Galago agrees with our type in the distribution and number of the 
interossei (see enlarged view, Pl. VI. fig. 30, I, I, If, Tf, double interossei, and Js! & Js?, 
superficial interosseal slips); some of these also appear on the dorsum of the foot; but 
we have preferred to regard them altogether as deep plantar flexors, although no 
doubt some of them are abductors of the digits to each other. 
There are three distinct double interossei in G. allenii, which arise from the tarsus, 
and are inserted by tendons into sesamoid bones on either side of the distal end of the 
metatarsals. Besides the above, there is a single and more superficial muscle arising 
by tendon from the plantar surface of the internal side of the fourth metatarsal, and 
inserted into the outer (peroneal) side of the proximal end of the proximal phalanx of 
the same digit. 
Nycticebus tardigradus and Cheiromys agree in having a superficial and deep layer of 
interossei. 
In Zarsius', besides the ordinary four double interossei, there are two superficial 
fasciculi going to the second and fourth digits. Respecting the first of these it is called 
“abductor digiti secundi” (49), the second is represented in table 5. fig. 10, just 
internal to the insertion (48), but is not described in the text. 
OPPONENS MINIMI DIGITI PEDIS.—In Lemur catta several fibres were observed distinctly 
inserted into the whole length of the fifth metatarsal. This little muscle appeared to 
arise between the fourth and fifth digits upon the plantar surface. 
These are not mentioned by G. Burmeister in Zursius. 
RESUME AND DEDUCTIONS. 
In our introductory remarks we alluded to the intermediate position assigned to the 
Lemuroids by most naturalists, namely, below the higher Primates (Man and Apes), 
but above all other Mammals. We shall now consider how far this is justified by those 
external characters and by the Myology of the forms which have been the subjects of 
our study. 
Some of the more exceptional structures presented by certain forms may be ex- 
plicable by peculiarity of habit, or by special exigencies of existence ; but others seem 
to be altogether destitute of any marked utility to their present possessors, and one or 
two are so bizarre as to render it very difficult, if not impossible, to conceive their ever 
having materially helped to preserve even the remote ancestors of existing species. 
Besides considerable variation (and in spite of certain strongly marked family resem- 
1 Loe. cit. p. 82. 
VOL. VII.—PART I. N 
