144 S. K. DETWILER 



Histories of characteristic anomalous cases 



Inasmuch as quite a large percentage of the experiments 

 resulted in gill and limb abnormalities of similar character, the 

 record of only a few such typical cases are appended. 



Case AA2S27 (figs. 23 and 24). 

 limb transplanted into gill region. 

 Wound covered. 



March 3, 1920. Operation. Rt. 

 Conditions as described in table 1 B. 



Fig. 23 Drawing of left lateral aspect of case AA2S27. Animal preserved 

 twenty days after the operation. X 10. 



Fig. 24 Drawing of right lateral aspect of case AA2S27 (cf. fig. 23). The 

 abnormal limb (L) has developed from rudiment transplanted into the gill region 

 (fig. 2). A club-shaped external gill {G) has developed dorsal to the appendage 

 and has fused wath its lateral side. Proximal portion of arm is fused to gill 

 ectoderm and points dorsocaudally. Two small gills are seen ventral to the 

 limb. X 10. 



March 29. Completely healed. 



April 2. Transplanted limb bud points caudally, as in figure 10. 



April 7. Two small gills developing ventral and shghtly anterior to 

 limb rudiment. 



April 12. Limb points dorsally and is closely applied to the ecto- 

 derm of the gill region, as in figure 6. 



April 16. Distal portion of the limb has rotated laterally and is 

 directed caudally. A flange of ectoderm dorsal to the limb has extended 

 out along the dorsal border of the arm. Two abortive gills situated 

 ventral to the hmb. • 



