

THORACIC APPENDAGES. 147 



and an anterior group of three pairs of maxillipedes 

 or foot-jaws, VIII. to VI., which possess both exo- 

 podites and endopodites, and aid in passing food to 

 the mouth. 



The thoracic appendages can be more easily removed, and 

 their relations determined, if the branchiostegite be first cut 

 away. 



XII. The last but one of the thoracic legs may be taken 

 as a type of the series. 



i. The protopodite consists of two segments, of 

 which the first, or coxopodite, is short and 

 broad, and bears a large gill and a tuft of long 

 fine hairs, the ' coxopoditic setae.' The second 

 segment, or basipodite, is much smaller, and 

 bears the endopodite. 



ii. The endopodite consists of five segments. Of 

 these the last is claw-like. 



XIII. This, the last thoracic leg, differs from XII. in 

 having no gill. In the male the coxopodite is per- 

 forated at its inner angle by the genital pore. 



XI. This resembles XII., but the penultimate seg- 

 ment is prolonged distally so as to form with the 

 last segment a chele or pair of pincers. The inner 

 angle of the coxopodite is perforated by the genital 

 pore in the female. 



X. This is like XL, but has no genital pore. 



IX. This is similar to X., but much larger and stouter, 

 the terminal chele being especially large and 

 powerful. 



VIII. The third maxillipede is directed forwards under 

 the five appendages in front of it. 



i. The protopodite consists of coxopodite, bearing 



