1898.] SKELETON OF ALTTES OBSTETRICAXS. lOo 



the limb were all dwarfed. The proportion of the web of the foot 

 was normal, but the five toes were disproportionately short, so 

 that the foot had a stunted appearance. In the skeleton (fig. 2, 

 p. 103) the tarsus and metatarsus call for no remark except that 

 the ratio between length and thickness is less than in the normal 

 Umb. The fifth digit has only two phalanges ; and in the fourth 

 digit, which suffers from an unnatural curve towards the postaxial 

 side of the foot, the antepenultimate phalanx is short and nodular. 

 The joint between the tibio-fibula and the proximal tarsals is not 

 square, as it should be, but slightly oUique. Exactly halfway 

 between the two extremities of the tibio-fibula is an u-regular 

 marking which delimits the regenerated distal half from the 

 primary proximal half. The two halves are in perfect continuity, 

 and the furrow between the tibia and fibula is also continuous. 



SPECiiiEN C (fig. 3). Even before preparing the skeleton of 

 the regenerated leg it was evident that the second and third digits 

 were syndactyle; and on removing the skin it became further 

 apparent that the distal extremities of the third and fourth digits 

 were immovably united. In the fully-prepared skeleton the 

 second digit is seen to be the only one which possesses the normal 

 number of phalanges, the remaining four being each one phalanx 

 short. There is nothing remarkable about the tarsus, but the new 

 distal part of the tibio-fibula is set at a sharp angle on the original 

 proximal part. Moreover, the orirjinal part of the tibio-fibida has 

 suffered distortion. 



Specimen D. This specimen is remarkable in that only the 

 preaxial part of the limb has been regenerated (fig. 4). ^ A distal 

 continuation has been added to the tibia but not to the fibula, the 

 astragalus is renewed but not the calcaneum, and of the five digits 

 only the three preaxial ones are developed. Only one small tarsal 

 of the distal row is present, and that belongs to the hallux. There 

 is no calcar, and, although the second digit has its usual two 

 phalanges, there are only two phalanges to the third digit, and 

 none to the hallux. 



Specimen E. The regenerated parts in this specimen consist 

 merely of a single digit, supported by three skeletal cartilages. 

 IS'o attempt has been made to complete the tibio-fibula, and there 

 is no tarsus. There is an interval between the tibio-fibula and 

 the skeleton of the digit (see fig. 5), and the axis of the latter 

 makes an angle of about 55° with the tibio-fibula. This case 

 appears to furnish a striking confirmation of the observation of 

 Mr. Boidenger, communicated above, that in the regeneration of 

 the limb the digits develop first, while the intermediate parts are 

 intercalated afterwards, and also that the digits develop in suc- 

 cession and not simultaneously. It would seem that here, after 

 the development of one digit, regeneration became arrested, so that 

 we have in the young metamorphosed Batrachian the persistence 

 of a very early phase of limb-regeneration. 



