354 SCOTT. [Vol. XI. 



another and still smaller one on the head of mt. IV. No 

 traces of any distal portions of the metatarsals of the lateral 

 digits, such as Kowalevsky figures for Gelocus, have yet been 

 found, nor is there any reason to believe that such existed. 

 Indeed, Kowalevsky does not explicitly state whether they are 

 figured in the pes on any better evidence than the analogy of 

 the manus. 



The Phalanges (PI. XXII, Figs. i8, 20), so far as is known, 

 are confined to the median digits, and in all probability, there 

 were no dew-claws. The phalanges of the pes are very much 

 larger than those of the manus and differ from them in several 

 details of structure, indeed, to quite an unusual degree. Aside 

 from its great increase in every dimension, the proximal 

 phalanx is like the corresponding bone in the manus ; the 

 distal trochlea is somewhat more deeply notched in the median 

 line and has a relatively greater dorso-plantar diameter, while 

 on the plantar side the trochlea is more prominent and con- 

 tinued farther proximally upon the shaft. 



The second phalanx is not only actually, but also proportion- 

 ately, much longer than the corresponding anterior phalanx, 

 and is of quite a different shape, being laterally compressed 

 and having its principal diameter the dorso-plantar instead of 

 the transverse. The proximal articular surface is more deeply 

 concave, more distinctly divided into two cotyles by a median 

 ridge, and the median elevation of the dorsal margin is more 

 pronounced. The rugose prominences for ligamentous attach- 

 ment are larger and more unsymmetrical, that on the external 

 side (tibial side of digit III and fibular side of digit IV) being 

 decidedly the more prominent. The distal trochlea describes 

 an almost exact semicircle and is extended more proximally 

 upon the dorsal side than is the case in the manus. 



The ungual phalanx is longer and straightcr than the ante- 

 rior one, its outer border being less curved, and the distal end 

 is more obtusely pointed ; the plantar face is more concave, 

 with more elevated borders, and the rugosity on the plantar 

 side beneath the articular facet is much more prominent. 

 The facet for the second phalanx is higher, narrower, and 

 more symmetrical, in that its two divisions are more nearly of 



