J. Playfair McMurrich 417 
The intermetatarsales. In Scincus and Iguana these muscles have 
the same structure and relations as the corresponding muscles of the 
hand. They are represented by four slender tendons (Figs. 3 and 4 im) 
which pass to the bases of the proximal phalanges of certain digits from 
certain metatarsals. The first tendon passes from the first metatarsal 
to the phalanx of the second digit; the second from the second meta- 
tarsal to the phalanx of the third digit; the third from the third meta- 
tarsal to the phalanx of the fourth digit; and the fourth from the fifth 
metatarsal to the phalanx of the fourth digit. Consequently the fourth 
digit receives the insertion of two of the tendons and the second and 
third digits each receive one. 
The nerve supply of the plantar region presents some interesting 
differences from what obtains in the urodeles. At the level of the ankle 
joint the medial plantar nerve or ramus profundus is situated deeply, 
resting upon the talo-calcaneus dorsal to the plantaris profundus I, 
while the lateral plantar or ramus superficialis fibularis hes upon the 
dorsal surface of the plantaris superficialis lateralis and has, therefore, 
a plantar position with reference to the plantares profundi (see Fig. 5 
of my paper on the crural flexors,04). The medial plantar retains 
its deep position as it is traced onwards into the foot, the flexores breves 
profundi, however, appearing between the nerve and the metatarsals so 
that the nerve comes to lie between these muscles and the flexor brevis 
medius str. profundum over the line of the second metatarsal (Fig. 3, 
mp). Over the proximal half of that bone it gives off a branch which is 
supplied to the various slips of the flexor medius and profundus sets 
of muscles which are inserted into the hallux, apparently also to the slip 
of the flexor superficialis which passes to that digit, and is finally dis- 
tributed to the adjacent sides of the first and second digits. The re- 
mainder of the nerve continues its distal course, bending slightly towards 
the fibular border of the foot so that it comes to lie at first over the 
second intermetatarsal space and then over the fibular border of the third 
metatarsal. It gives off a branch to the fibular side of the second digit 
and toward the head of the third metatarsal it divides into two terminal 
branches which supply the sides of the third digit. The peculiar condi- 
tion is thus produced that the muscular distribution of the nerve is con- 
fined to the muscles inserting into the hallux, while its cutaneous dis- 
tribution extends over the three tibial digits. 
The lateral plantar behaves quite differently. Beyond the ankle joint 
it continues its course lying over the fifth metatarsal between the termi- 
nal portion of the plantaris superficialis lateralis and the abductor quinti 
