128 



S. E. DETWILER 



teristic posture of a developing gill and pointed almost dorsally 

 as is seen in figure 6. The Umb later changed its orientation and 

 developed into an appendage with considerable freedom of 

 movement, and which was normal except for a reduplication of 

 the digits (fig. 7). 



Examination of sections of the above case showed that the 

 glenoid fossa was situated slightly dorsal and approximately the 



6 7 



Fig. 6 Lateral view of case AA2Si5 drawn fifteen days after operation, showing 

 typical gill posture of the developing appendage (LB) which occupies the position 

 of the third external gill (fig. 2). Normal limb posture at approximately same 

 stage is seen in figure 23. X 10. 



Fig. 7 Dorsal view of case AA2Si5 drawn fifty-three days after the operation. 

 The transplanted limb occupies the region of the third external gill (fig. 2). 

 X 5. 



distance of two segments anterior to the normal position. The 

 shoulder-girdle was well formed. All of the shoulder muscles 

 which typically develop in the heterotopic position from a typical 

 limb-bud transplantation (Detwiler, '20, p. 136) were present. 

 The m. coracobrachialis longus and the m. coracobrachialis brevis 

 were small and abnormal. The remainder of the shoulder mus- 

 cles were typical. The musculature of the arm was somewhat 

 deficient on the extensor surface. The limb and shoulder mus- 



