Limb-bones of Ma»so»pon(\y\\i?. {?) Browni. 123 



total length of the four bones placed together in contact is 

 rather less than 4 inches. The claw-phahmge is somewhat 

 broader on the upper surface, and, besides being generally 

 smaller, is relatively less deep. The groove on the side of 

 the phalanj;e is chiefly develoj)ed on the inner margin ; on 

 the outer side it is short and siiallou'. There is no interior 

 thickening, but a slight thickening above the articular surface, 

 which is wider below than above. 



The third digit I regard as including five phalanges and as 

 having a length of 4^ inches. These bones are more elevated 

 than in the other digits and somewhat naiTower from side to 

 gide. They preserve the same general character, but the 

 fourth j)halange, if rightly referred to this limb, is small and 

 short, being less than | inch long and ^ inch wide. The 

 claw-phalange is very similar to that in the first digit. 



WMiat I suppose to be the fourth digit is very slender, and 

 the first two phalanges are much compressed from side to 

 side, though the compression may be partially due to squeezing. 

 The first is -^^ inch long, fully | inch wide at the distal end, 

 and about as high. The second is f inch long and somewhat 

 narrower at the distal end. The third phalange is ^ inch 

 shorter and more depressed ; but this depression seems to me 

 to characterize the penultimate phalange in each digit. The 

 claw-phalange, as preserved, has lost the extremity and is 

 much compressed from side to side. It is about ^ inch wide 

 and more than ^ inch deep. It may have been | inch long 

 when complete. 



The fifth digit can only be restored conjecturally. A 

 small bone, which has the aspect of being a proximal 

 phalange, is ^ inch long, as deep as wide, expanded at both 

 ends, the distal end being almost hemispherical, without 

 any trace of the vertical median channel which charac- 

 terizes all the other digital phalanges. The fourteenth 

 phalange is different in shape to any other, and may have 

 been a depressed penultimate phalange or have belonged to 

 another limb. The distal end shows no trace of the usual 

 vertical superior groove, and it is only slightly indicated on 

 the underside. There are slight ligamentous pits at the sides 

 of the articulation, which appear to indicate that the digit 

 terminated either in a claw or another phalange, which is 

 not preserved. 



So far as they admit of comparison, these bones are very 

 similar to those which have been attributed to MafisospoiK/i/lua 

 carinatus, especially the claws, and the phalanges oidy ditfcr 

 in being rather better ossified. A similar type of digital 

 phalange is observed in the fossil described trom Ea"-le's 



