﻿200 ELEMENTARY BIOLOGY. [CHAP. 



during life, is received into a recess of the mandible. 

 Its epipodite; well developed, and united in front 

 with a lamina, which probably represents the exopo- 

 dite, to form a wide oval plate (scaphognathite) which 

 lies at the anterior end of the gill-chamber (Cf. 

 Sect. H. c. and p. 182). 



If the above appendage be examined in the living 

 animal, it will be found that with every movement 

 of the scaphognathite there is a corresponding pull 

 upon its filamentous endopodite. 



i. The first maxilla. Epipodite and exopodite un- 

 developed. The endopodite is reduced to the 

 condition of a small squame; its protopodite is 

 foliaceous and two-jointed, the basal segment 

 (coxopodite) being blade-like and recurved, with 

 its free end inserted, during life, into the oral 

 aperture. (Cf. Sect. E. 6 d.) 



In the Lobster, the endopodite is large and seg- 

 mented. 



k. The mandible. Its strong toothed basal-joint (pro- 

 topodite) bearing a small appendage (the pal f) which 

 represents the endopodite; epipodite and exopo- 

 dite unrepresented. 



/. The antenna. Its two-jointed basal portion (pro- 

 topodite) bearing a flattened protective squame (the 

 modified exopodite} and a long multi-articulate 

 filament (the endopodite), the two basal segments of 

 which are greatly enlarged and modified for pur- 

 poses of articulation. Note the opening of the 

 green gland (Cf. Sect. A. c. 8) on the under side of 

 the basal joint of the protopodite. 



