170 MR. F. G. PARSONS ON THE [Jan. 14, 
Epitrochleo-anconeus.—This is present in all the Myomorpha ; it 
is supplied by the ulnar nerve. 
Pronator Radii Teres.—This muscle agrees with the description 
given of it in other Rodents; in Mus barbarus and Oricetus it is 
inserted into the second quarter of the radius, while in all the 
other animals examined it goes into the middle of that bone. 
Cricetomys resembles Sciurus in possessing a supracondylar 
foramen, but in it the pronator teres does not rise from the supra- 
condylar arch, as it does in Sciwrus. 
Flexor Carpi Radialis—The attachments of this muscle were 
normal in all cases. In the Vole, and, to a lesser extent, in all 
Rodents, the tendon of this muscle is bound down to the flexor 
surface of the radius by a fibrous pulley just below the attachment 
of the pronator radii teres. 
Palmaris Longus.—The muscle is present and large in Cricetomys, 
Oricetus, Microtus, Georychus, Bathyergus, Mus rattus, Siphneus, 
and Heteromys; it is inserted into the palmar cartilage or ossicle 
and into the fascia of the palm. In Lthizomys and Grerbdillus it 
is only inserted into the fascia, while in Myowus it is absent. 
In Mus barbarus it is developed as a slip from the surface of the 
flexor sublimis digitorum, an arrangement which recalls that found 
in Celogenys and Xerus. 
Flexor Sublimis Digitorum.—In ail the animals examined, except 
Myowus, this muscle rises from the internal condyle and forms 
the flexor perforatus for the 2nd, 3rd, and 4th digits. In Myoxus 
it also goes to the 5th digit. Milne-Edwards describes the slip 
to the 2nd digit as a distinct muscle in Siphneus. 
Flexor Carpi Ulnaris.—This muscle has the usual attachments, 
except that in Rhizomys and Bathyergus the origin from the 
internal condyle is wanting. The tendon is specially thick in 
Georychus. 
Flexor Profundus Digitorum.—The deep flexor of the fingers is 
composed, as in vther Rodents, of two superficial heads from the 
internal condyle and of two deep heads from the flexor surfaces 
of the radius and ulna. A small slip is given off to the pollex 
from the front of the tendon formed by these heads in Cricetomys, 
Gerbillus, Microtus, Mus barbarus and rattus, Myodes, Georychus, 
Bathyergus, and Rhizomys. In Myowus, Cricetus, and Siphneus 
(Milne-Edwards) no tendon goes to the thumb. In Bathyergus 
the fibres derived from the different heads were traced downward 
through the tendon, and it was found that the two condylar 
heads join together to form the superficial part of the tendon, 
which gradually winds round the outer side to eventually become 
deep. When the tendon divides into its ultimate five slips for 
the four fingers and the thumb, each slip receives fibres both from 
the condylar and the radio-ulnar origins. This twisting of the 
tendon reminds one of the arrangement of the fibres of the tendo 
Achillis*. There are usually four lumbricals which arise from 
the flexor surface of the tendon at or before its point of division. 
1 Author's paper, ‘Journ. Anat.’ vol. xxvii. p. 414. 
. 
; 
—— a re 
