1897.] NATURAL SCIENCES OF PHILADELPHIA. 53 



the muscle last named on the lower edge of the bone. Observation 

 of the specimen when flayed shows a decided antero-posterior curva- 

 ture of the cervical vertebrae. 



The singularly small innominate bone indicates that no correla- 

 tion can be established between it and the rest of the enormous in- 

 ferior extremity. The following are the measurements of the bone : 

 Tuberosity to pubis 15 mm. ; center of acetabulum to vertebrate 

 margin 2i mm.; width and length of sacral facet 3 mm. ; length of 

 ilium 22 mm. The ischial spine is very prominent and shows ex- 

 ceptional power in the Obturator internus and Gemellus superior. 

 While the bone is but 28 mm. long the rest of the limb measures 

 183 mm. 13 The knee joint is remarkable for the great contrast be- 

 tween femoral condyles, the outer being twice as large as the inner. 

 The patellar notch, as already noted on p. 49, is extraordinarily 

 long and deep, being 7 mm. long, while the condyle is but 3 mm. 

 The groove appears to represent on the front of the joint the ob- 

 liquity of the outer tibial tuberosity on the back. 



The fibula joins the shaft of the tibia at the beginning of the dis- 

 tal third. The position of the head is indicated. Burmeister's de- 

 scription corresponds to the above, though from the figures it could 

 be inferred that the shaft of the bone was outlined throughout, i. e., 

 never having been lost in that of the tibia. The excursus of the 

 heel (taken as a measurement of the range of knee joint) is 29 mm. ; 

 that of the mid-tarsal joint (taken as a measurement of the ankle 

 movement) is 7 mm. 



The astragalus is one-third the length of the scaphoid bone. The 

 scaphoid at the astragalus rests in front and over the calcaneum, 

 but at the mid-tarsal joint the scaphoid is on the same plane with 

 that of the calcaneum. The motion between the scaphoid bone and 

 the astragalus recalls that between the radius and the humerus, the 

 position at rest is semipronation, and the excursus is to yet deeper 

 pronation ; there is no supination. 



The general aspect of the plantar surface is like that of the fore- 

 arm in most mammals if the scaphoid and the calcaneum might be 

 compared to the radius and the ulna, while the cuboid and ento- 

 cuneiform bones might be compared with the pisiform bone and 

 trapezium. In Tarsius both the cuboid and the ento-cuneiform 



13 The thigh, tibia and foot are each about 60 mm. long when dissected, but 

 in the undissected limb, owing to the flexing of the finger, the foot is 52 mm. 

 long. 



