So 



E. A. ANDREWS. 



it is set with plates at the same rate as on an equal length of claw 

 edge. If the common base of the prongs were to be split for 

 about two fifths of its length and the prongs so lengthened they 

 could bear about seventy plates each and the prongs would be 

 much more like the normal claw ; still it would be necessary to 

 transform the present terminal plates at the angle into plates of 

 the right character in the new series and to make new terminals 

 at the new proximal ends. 



But little was made out regarding the internal anatomy of this 

 abnormal limb either from preparations cleared and stained or 

 from sections ; but it was evident that the muscles in the propo- 



FIG. 5- Camera sketch, 2-D, of a posterior view of the plates at the angle between 



the two prongs. 



dite were not arranged as in a normal propodite. At the distal 

 end there were two muscle masses that seemed to connect with 

 opposite edges of the articular end of the pronged structure. 

 These would probably move this structure up and down in the 

 plane of the claw. The usual muscles of abduction and adduc- 

 tion seemed to be developed, but attached to the dactyl in an 

 abnormal way in connection with the above extra muscles and 

 with abnormal widening of the distal part of the propodite. 



The gist of the above description is that this abnormality is a 

 case in which the propodite is to some extent double and bears a 



