20S 



Arthropoda. Glass 1. Crustacea. 



the adult animal ; the antennules, each consisting of a three-jointed 

 peduncle and two multiarticulate filaments, of "which the outer hears 

 the olfactory setae (the inner is often absent) ; the antennae, in which 

 the peduncle is five-jointed, and produced into a multiarticulate 



Fig. 170. The appendages of a Lobster, 3; all of the left side and viewed 

 from below. In the npper row are represented : antennnle (A^), antenna (.42); mandible.-", 

 first and second maxillse (Vh, Mk, Hk), the three maxillipeds (Kf^ — 3). In the middle row 

 the ambulatory legs. In the lower row the abdominal appendages, i endopod, y exopod, 

 h epipod, g gill, k opening of antenuary gland. — Orig. 



