94 MESSRS. MURIE AND MIVART ON THE 
3. The peroneus quinti digiti is well developed; it is likewise present in Nycticebus. 
4. The biceps flexor cubiti consists of two bellies in the above group, and also in 
Perodicticus. 
5. The extensor indicis has a single belly in Lemur (with one exception), Cheiromys, 
Tarsius, and besides in Vycticebus and Perodicticus, but not in Galago. Tendons go to the 
second and third digits in Lemur, Galago, and Tarsius. In Cheiromys and Tarsius (and once 
in Lemur) an extra tendon supplies the fourth digit, and in Perodicticus the fifth digit. 
6. The extensor communis digitorum (manus) in Lemur, Galago, and Tarsius splits 
into four tendons (an exceptional example of L. varius having on one side but three, 
and a Galago possessing two subsidiary uniting transverse slips). Our specimen of 
Cheiromys presented a double-bellied muscle, subdividing into seven tendons, the 
second, third, and fourth digits receiving two tendons each. 
7. In all the genera comprising Group I. the extensor minimi digiti of the hand has 
fourth and fifth digital tendons. Over and above, L. catta has an extra indicial deri- 
vative tendon, 
8. The flexor sublimis digitorum has usually four perforated tendons. 
9. At the wrist the flexor profundus digitorum and flexor longus pollicis have a single 
broad and strong common tendon. 
10. In the above group, and also in the genus Perodicticus, the flexor longus pollicis 
is double-headed (once in Cheiromys it occurred three-headed); but in all no special 
tendons go to any digit but the pollex. 
Group II. Lemur, Cheiromys, and Tarsius. 
1. The three genera which we have here brought together are equally distinguished 
by the soleus muscle having, as in higher Primates, a long fleshy belly. 
2. They each have a peroneus quarti digiti muscle. 
3. Lemur and Cheiromys, but not Tarsus, have the flexor longus hallucis arising 
from both the tibia and fibula. 
4, The masseter is double in Cheiromys and Tarsius, but not in Lemur or the other 
forms. 
Group III. Lemur and Tarsius. 
1. A subcrureus has been found by us only in Lemur nigrifrons, and by Burmeister 
in Tarsius. 
2. In this division, partly including the genus Galago, the insertion of the rectus 
anticus major does not pass beyond the cervical region. 
Group IV. Lemur and Cheiromys. 
With the exception of LZ. catta, the species of the genus Lemur and the single one 
of Cheiromys have each a double-bellied and tendinous tibialis anticus muscle. In all 
other Lemuroids it is single. 
