100 ME. A. L. ADAMS ON THE OSTEOLOGY OF 



racter of the immature bone. Taken in comparison with the Asiatic, they represent 

 an animal of the usual proportions of the largest form, being of the dimensions of 

 the same bone in the Netley skeleton, and nearly equal, if not equal, to that in the 

 Museum of Guy's Hospital, and 2677a Eoy. Coll. Surg. 



B Tyjie. — An old bone considerably smaller than the fourth metacarpal, C type, with 

 a convexity of its dorsal aspect almost like a deformity, is nearly entire, with the loss only 

 by decay of portions of the third- and fifth-metatarsal facets. In outline it is like the 

 African ; ?'. e. the outer and inner sides of the shaft are even and want the central expan- 

 sions so apparent in those just described ; the cuboidal facet on the dorsal margin is 

 also like the African. The length of the bone is 2-7 inches; breadth, midshaft, 1-5 ; 

 depth, midshaft, internally '7; depth of posterior articular aspect 1-5 ; cuboidal facet 

 I'D by 1'3. The articulating surface for the first phalanx is 1'5 by 1-4. 



This intermediate-sized fourth metatarsal indicates an animal of the dimensions 

 assignable to the slender-formed fourth metacarpal of B type. 



C Tyiie. — I have before surmised that PI. V. fig. 3 and PI. XX. fig. 5 may repre- 

 sent the second and third metatarsals of the same type ; indeed it might be of the same 

 individual. I have also referred to PI. XX. fig. 6 as being probably the fourth meta- 

 tarsal'. This specimen has a recent oblique fracture across the head and some abrasions 

 of the posterior lateral facets ; but otherwise it is entire, and furnishes these measure- 

 ments — length 2'3 inches, breadth (midshaft) I'l, depth internally -8, depth of posterior 

 articular surface 1'4, cuneiform-facet 1"2 by 1, anterior articulating surface 1'3 by I'l. 

 This bone has much of the general configuration of a fourth metacarpal, and is precisely 

 of the same length as the fourth metacarpal of the skeleton in the Oxford University. 

 It is very doubtful, therefore, whether or not PI. XX. fig. 6 and the two others are fore- 

 or hind-foot bones ; and this will be more cogently indicated when they are compared 

 with the very diminutive fore-foot bone- PI. XXI. fig. 5, and its associates so frequently 

 referred to in connexion with the preceding, and which, in point of type, might be classed 

 with the following. 



D Tyjie. — I now come to consider a very diminutive fourth metatarsal ; it is the same 

 referred to in connexion with its third toe (PI. XIX. fig. 7) ; it is shown in fig. 6 of 

 the same Plate. The lower portion of the anterior articulation is lost through erosion ; 

 and for the same cause there is a loss of the upper portion of the proximal end; but the 

 entire length is preserved. The latter is 1-9 inch, breadth (midshaft) -9, depth inter- 

 nally -7, posterior articulating surface 1, third-metatarsal facet -8 by -4; phalangeal 

 articulation is 1 in. in breadth. • In the Oxford-University skeleton referred to in 

 connexion with the third metatarsal of the above I find that the fourth bone in the fore 

 foot is 2-5 inches, and in the hind 2-1, thus displaying the same disparities as regards 

 relative lengths^. 



' Page 95. ' Page 76. 



. ' It must be understood that the mean length only is taken, as the articular surfaces, from their un- 

 developed states in the young of this age, make it impossible to ascertain correct dimensions. 



