352 MR. P.L.SCLATER ON A NEW INDIAN PORCUPINE. [Apr. II, 
bone, and is inserted, by a small tendon, into the fascia adjoining 
the innermost sesamoid (fig. 8, I. 1). 
The second single interosseous arises from the plantar surface of 
the os naviculare and one of the cuneiform bones, and is znserted into 
the outer surface of the proximal end of the proximal phalanx of the 
index digit by a small tendon (fig. 8, J. 2). 
The third single interosseous muscle arises from the fascia on the 
under surface of the proximal end of the middle metatarsal bone, 
and is ¢nserted into fascia on the inner side of the imner sesamoid 
bone of the middle digit (fig. 8, I. 3). 
The fourth single interosseous muscle arises from the strong ten- 
dinous fascia covering the plantar surface of the cuboid, and is in- 
serted into the inner side of the proximal end of the proximal pha- 
lanx of the outermost digit (fig. 8, I. 4). 
The existence of the interossei of the foot is mentioned by Meckel 
(Joc. cit. p. 461), but nothing is said in the way of description. 
A very strong and thick ligamentous fascia covers the under and 
outer side of the caleaneum ; muscular fibre contained in and arising 
from this is inserted into the head of the outermost metatarsal bone 
(fig. 8, Ab. 0.m.g.). Query,—Does this represent Prof. Huxley’s 
abductor ossis metacarpi quinti, only here attached to the fourth 
instead of to the fifth metatarsal ? 
After having thus passed in review almost all the muscles of the 
Hyraz, it might perhaps be expected that we should express some 
decided opinion as to the value of these in reference to the zoological 
affinities of the animal. But this we are not prepared to do. 
Tt is true that such characters as the attachment of the sterno- 
mastoid to the mandible, the development of the sterno-scapular, 
the very small size of the deltoid, but enormous proportions of the 
triceps, and great extent of the brachialis anticus, together with the 
arrangement of the glutei, the vast size of the semimembranosus, 
the attachment of the extensor longus digitorum to the femur, &c., 
tend rather to confirm than otherwise those ungulate affinities which 
have been attributed to the Hyraz. 
But, on the other hand, we find so many resemblances to the 
Rodentia, as exemplified in the Guinea-pig (specially selected by us 
for comparison as the most Pachyderm-like of accessible Rodents), 
that we are indisposed, from the consideration of the muscular struc- 
ture alone, definitely to assign the Hyrax to one or other of the 
ewisting orders constituting the class Mammalia. 
2. DrescrirtTion or A New Species or INDIAN PorcuriIne. By 
P. L. Scuarer, M.A., Pu.D., F.R.S., SrecreTARY TO THE 
Society, 
(Plate XVI.) 
About three years ago I received a communication from our excel- 
Jent Corresponding Member, Colonel Sir William Thomas Denison, 
