1894.] 



MAMMALIAIf HAND AND FOOT. 



375 



Hand. 



Scaphoid. Eadiale. 



Pros. 



Centrale. 



Lunatutu. 

 f Triquetrum 

 \ (pyramid.). 



(Pisiform.) 



Centrale. 



Intermedium. 



Ulnare. 



NaTiculare. 



Foot. 



f Navic'ulare tib. ' 

 \ (tuberos.). 

 J Naviculiire fib. 

 1 (lat.). 



Talus s. 8. 1 



Trigonum. j Astragalus. 



(Calcaneum.) 



As regards the distal row there cannot be any doubt that the 

 trapezoid and uncinatum are homologous with the middle cunei- 

 form and the cuboid. 



As tlie internal cuneiform (EretJiizon, Man sometimes) and the 

 external {Cryptoprocta) can be divided into two bones, we must look 

 for the homologous bones in the hand ; and I think that the radial 

 part of the trapezium (sometimes a free ossicle in Man) corresponds 

 to the tibial or the plantar internal cuneiform, aud that the head 

 or proximal part of the magnum (Man), or the lateral part of the 

 centrale (e. g. Centetes), corresponds to that bone which is situated 

 proximally to the external cuneiform in Cnjptoprocta. I cannot 

 prove beyond all doubt that this is the second centrale, but there 

 seems to be no other explanation. Consequently the distal row 

 would be as follows ; — 



Foot. 



Internal cuneiform. I Pl'inta'"^- 

 [ JJorsale. 



Middle cuneiform. 



J External cuneiform s. s. 



\ Triaugulare, B. 



Cuboid. 



Hand. 



Trapezium. Carp. tars. dist. 1. 



Trapezoid. Carp. tars. dist. 2. 



■,, „ r Carp. tars. dist. 3. 



Magnum. | Centrale 2. 



f Carp. tars. dist. 4. 

 Unciform. i 



(separated : [ Carp. tars. dist. 5. 



Ziphius). 



P.S. {April 23, 1894). — Since I read this paper I have found a 

 specimen of Euphractus minv.tus in the Nat. Hist. Museum in 

 which there is a very well-developed prsehallux, like a metatarsal 

 bone (see Plate XXI. fig. 7). There is also a muscle between the 

 Ph. and the first metatarsal bone. 



EXPLANATION OF THE PLATES. 



Plate XX. 



Skeleton of Mammalian Hands a7id Feet. 



Fig. 1. Eight foot of Dasypus, .3/2 enlarged (p. 3.56). 



2. Right hand of Centetes ecaudatus, 3/2 enlarged (p. 356). 



3. Eight foot of Centetes ecaudatus, 3/2 enlarged. 



4. Eiglit foot of Batht/ergus maritimus, 5/3 enlarged (p. 356). 



5. Right foot of Erethizon dorsatus seen from above, nat. size (p. 357). 



6. Prahallux of Frethizon, seen from behind, 3/1 enlarged. 



7. Eight hand of JElurusjidgens, 5/4 enlarged (p. 358). 



8. Right foot of Mlurus fulgens, nat. size. 



9. Astragalus of Mlurus seen from behind, showing the division into 



" talus " s. s. and " trigonum." 



25* 



