PLATES 
All of the figures in plates 1, 2, and 3 are microphotographs of transverse 
sections cut 10 uw in thickness and magnified 30 diameters. The larvae were 
fixed in sublimate-acetic killing fluid and the sections stained with Ehrlich’s 
haematoxylin and Congo-red. All operations were made on the right side 
which, in the figures, appears as the left. 
ABBREVIATIONS 
cor, coracoid 
g.c, glenoid cavity p.cor, procoracoid 
hum, humerus pn, pronephros 
m.dsc, muse. dorsalis scapulae se, scapula 
m.Spc, Muse. supracoracoideus s.sc, suprascapula 
my, myotome vlm, ventro-lateral musculature 
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