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S. R. DETWILER 



coracoid, was molded into a typical shoulder-joint (fig. 30). 

 This figure represents a transverse section at the level A — A in 

 figure 17. A muscle mass connected the coracoid with the hu- 

 merus, but the individuahty of themuscles could not bedetermined. 

 The extensor musculature of the limb was well developed and 

 suppHed by a small nerve trunk. The flexor musculature was 

 sparse, but functional. A nerve trunk of considerable size was 

 also found on this surface of the appendage. Considerable 



Fig. 18 Graphic reconstruction of the segmental nerve supply to the anterior 

 and posterior members of anomalous limb reduplication in case AA2S73. X 25. 

 Arrow A indicates position of anterior member; arrow B of posterior member; 

 arrow C designates normal limb level. 



movements in the forearm and hand were observed. The nerve 

 contribution to this appendage was derived from the main por- 

 tion of the ventral ramus of the second spinal nerve, which had 

 elongated anteriorly a remarkable distance to effect this connec- 

 tion (fig. 18). The base of the caudal limb was situated ap- 

 proximately the distance of two body segments anterior to the 

 normal position. The shoulder-girdle was well formed (fig. 31). 

 Its extreme dorsal portion (suprascapula) was connected with 

 the fragmentary coracoid of the anterior limb by means of a bar 

 of cartilage which was taken to be a modified branchial bar 



