CHAP. XIII.] 



DOUBLE-HAND. 



337 



carpus of this hand there was a soft tumour about 2'5 cm. in 

 height, resembling a cyst with a firm wall. 



Fig. 95. Dorsal and palmar aspects of the left hand of No. 498. 

 are numbered from the inside. 



(After Jolly.) 



The digits 



I 



The structure of the bones of the arm and fore-arm could not 

 be made out with certainty in the living subject, but it appeared 

 that the humerus was formed by two bones partially united 

 together. 



As regards the skeleton of the fore-arm an ulna could be felt 

 extending from the upper arm to the processus styloideus. The 

 existence of a radius could not be made out with certainty, but a 

 second bone could be felt which was in very close connexion [with 

 the ulna]. Jolly, Internal. Beitr. z. wiss. Med., 1891. 



Male child, three years old, twin with a normal female child, 

 having all extremities abnormal. Right hand. Six metacarpals 

 arranged in two groups of three in each group. Each bore a 

 three-phalanged digit, none resembling a thumb. The first and 

 sixth were alike, resembling a minimus, while the two median 

 fingers resembled middle fingers. On the radial side the three 

 digits were completely united together. The next was free, and 

 the two external to this were also united. Left hand. Like the 

 right, but all the fingers united together in two groups of three in 

 each group. Feet. Each foot had nine metatarsals and nine digits, 

 the central being like a hallux and having two phalanges perhaps, 

 but thicker than a hallux. The externals were like minimi. The 

 four toes on each side of the " hallux " were united two and two. 

 The tarsus was of about double size. The right leg was shorter 

 than the left. Gherini, A., Gaz. med. ital.-lombard., 1874, Xo. 51, 

 p. 401, figs. 



B. 



22 



