456 DR. J. MURIE ON THE ANATOMY OF THE WALRUS. 
cuneiform, and is fleshy three-fourths the length of the hallucial metacarpal, being 
inserted by tendon and fascia into and over the metacarpo-phalangeal joint. Both in 
the Sea-lion and Seal, tendinous fascia takes the place of this muscle; but it is note- 
worthy that in Ursus americanus its representative is found. 
Fig. 8. 
Dissection exhibiting the deep layer of the muscles 
of the sole of the left hind foot, and partially 
those of the lower leg. 
Po. Popliteus, Fil.d, F.l.d*, Flexorl ongus digito- 
rum. /'/.h. Flexor longus hallucis. Zp. Tibi- 
alis posticus. A and JV. Arteries and nerves. 
So. Soleus, and Ga. Gastroenemius, cut short. 
F.bmd, Flexor brevis minimi digiti. Ab.md. 
Abduetor minimi digiti. Ab.o.m*®. Abductor ossis 
metacarpi quinti. S.2.14?. Superficial layer of 
interosseous muscle. 1, 2, 3, 4, 5. Numerically 
apply to the double (or deep) interossei. £.b.A 
and Ad.h, Deep, short metatarsal bellies equivalent 
to a flexor brevis hallucis and adductor hallucis. 
D.p.f. Deep palmar fascia partially removed to 
show the short metatarsal slips. 
The two short extra and deeply situated muscles met with in the sole of Ofaria 
Jubata ave exactly similar in appearance and situation in Trichechus rosmarus. From 
position and attachments, though covered (and, indeed, entirely hidden) by the deep 
plantar fascia, they nevertheless may be the homologues of a double adductor hallucis, 
though it is still more likely that the tibial division is a flexor brevis hallucis, and the 
fibular one above an adductor (see woodcut, fig. 8, 7.6.4 and Ad.h). 
The abductor minimi digiti is not unlike that of the Sea-lion; however, in the 
Walrus (woodcut, fig. 8, 4d.m.d) it comes from the outside of the os calcis, and not 
from the plantar fascia. Its tendon is also longer in the latter, and its muscular belly 
not so strong. 
Flexor brevis minimi digiti.—This exhibits a degree of variation from what obtains 
in the Eared Seal. In the Morse (woodcut, fig. 8, 7.4.m.d) it commences by a broad 
strip of muscular fibre from the outside of the middle of the os calcis, just in front of 
