542 



ANATOMY OF VEETEBKATES. 



360 



opposable, fig. 343, b. The Galagos ( Otolicnus) and the Spectres 

 are, also, exceptional, by the excessive length of the calcaneum 

 and naviculare in the hind-hand, whence the generic name Tar- 

 sius given to the latter Lemurs. In the relative length of the 

 tarsus to the leg and to the rest of the foot Chiromys most re- 

 sembles Lichanotus and Pj^ojnthecus : it is rather shorter than 

 in Lemur proper, being less than one third the length of the 

 tibia, and only about one fourth the length of the whole foot. 

 The scaphoid and calcaneum are proportionately rather shorter 

 than in Lemur jjerodicticzcsK 



In the Indri (^Lichanotus) the scapula is remarkable for the 

 length and strength of its coracoid process. The humerus, as in 

 Chiromys, is perforated above the inner condyle, but not between 

 the condyles. The interosseous space is consider- 

 able between the long and slender radius and the 

 more slender ulna. The ilium has a strong tuber- 

 cular process above the acetabulum. The femur 

 is so long as to equal in length seventeen verte- 

 bras of the trunk, measured from the first dorsal 

 backwards. The fore part of both the astragalus 

 and calcaneum is unusually produced. In the 

 slender Lemur {Stenops gracilis) the humerus is 

 perforated above the inner condyle, and has a 

 Avide intercondyloid vacuity. The iliac bones, fig. 

 360, a, are long, slender, and extended almost in 

 the same line with the sacrum. The pubic bones, 

 b, c, join the ilia at a right angle, and are in- 

 clined to each other at an angle of 40° ; they form 

 a very short symphysis. There is a small ossi- 

 fied patella. The feeble development of the vertebrae in the long 

 lumbar region, the small sacrum, and contracted pelvis are points 

 of resemblance with the Bat-tribe ; and, together with the long 

 and slender bones of the extremities, relate to the slow move- 

 ments of this climbing quadruped. 



In Lemur Catta I have found the pubic symphysis ossified ; the 

 ilium has an epicotyloid ridge. The coracoid and acromial pro- 

 cesses of the scapula are subequal. The humerus is perforated 

 above the inner condyle. Two fabellas are usually attached to 

 the capsule of the knee-joint. The fourth digit is the longest 

 on both limbs of all LemuridcB. 



In Hapale Jacchus the coracoid sends a short process backward. 



* The tarsal bones figured as those of Chiromys in civ. ' Lemurs,' pi. v., belong to 

 the Otolicnus crassicaudatus, cir. p. 35. 



Pelvis of tlie slender 

 Lemur. 



