THORACIC APPENDAGES 131 



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

 having no gill. In the male the coxopodite bears 

 at its inner angle the genital pore, 



XI. This resembles XII., but the propodite is pro- 

 longed distally so as to form with the dactylo- 

 podite a pair of pincers or chelae. The inner 

 angle of the coxopodite -is perforated by the 

 genital pore in the female. 



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



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

 the terminal chelae being especially large and 

 powerful. The basipodite and ischiopodite are 

 firmly fused together, as happens occasionally in 

 other limbs of the series. 



The anterior group of thoracic appendages, or maxilli- 

 pedes, can be more easily removed if the anterior portion oj 

 the branchiostegite be first cut away. 



VIII, The third maxillipede is directed forwards under 

 the five appendages in front of it. 



i. The protopodite consists of coxopodite, bearing a 

 gill and coxopoditic setae ; and basipodite, 

 bearing endopodite and exopodite. 



ii. The endopodite consists of five joints, named as 

 in the legs. The first joint or ischiopodite is 

 the largest and is fused to the basipodite. 



iii. The exopodite is slender, and consists of a long 

 proximal joint and a distal many-jointed fila- 

 ment. 



VII. The second maxillipede is smaller and less firmly 

 calcified than VIII., which it resembles in form ;" 

 but'the exopodite is larger than in VIII,, and the 

 endopodite smaller, its largest joint being the 

 meropodite, and all its joints being movable. 



VI. The first maxillipede is smaller and softer than 

 VII. 



K2 



