ORGANIC EVOLUTION 



235 



their typically paired arrangement. The gills of Gammar- 

 us are appended to the bases of the thoracic legs on the 

 inner side. 



Study the segmentation of the body and examine the 

 appendages in series, carefully, in the several types, with 

 the aid of the mounted slides where necessary, and fill 

 out a table of homologies prepared as indicated on the 

 preceding page. 



Then make out a table of functions for the appendages of 

 the several types, as indicated below, basing it first of all 

 on what you have observed of the uses of the several organs 

 while studying the living specimens. Legitimate inferences 

 as to functions, may be drawn from the form and location 

 of appendages. 



Table of functions of malacostracan appendages. 



*Specify functions in foot notes. 



Indicate segments by number only (i to 20), as in preceding table. 



Specify characters of male and of female separately, where they differ. 



