CRUSTACEAN LEG SEGMENTS — CARPENTIER & BARLET IO5 



very unequal and their upper limits are indistinct. The region anterior 

 to the apodeme appears to have very little extension, but its lower 

 precoxal part obviously proceeds proximally to the anterior angle of 

 the coxa. Higher, the same anterior region of the lateral wall bears 

 a winding ridge of a general direction parallel to that of the pleural 

 apodeme. This ridge, which is about abreast of the intersegmental 



Figs. 2 and 3. 



Fig. 2. — Basal part of the 3d right pereiopod of Penaeus caramote Risso, seen 

 from inside, setae omitted. 



Fig. 3. — Basal part of Sth right thoracic limb (4th pereiopod) of Anaspides 

 tasmaniae Thomson, seen from the front, setae omitted. 



an, laterotergite, sclerite pertaining to a region which seems homologous with 

 the anapleuron of the Apterygota; ap, pleural apodeme; bp, basipodite; ex, cox- 

 opodite ; e, spot where the endosternal arm e is attached ; em, epimeral region ; 

 es, epistemal region; ex, exopod; /, spot where the endosternal arm / is at- 

 tached ; fu, furcal apophysis ; gl, gill ; h, spot where the endosternal tie h is 

 attached; is, ischiopodite ; Ig, laterotergite; ph, phragm; pp, (medio) pleural 

 process ; ps, postpleural process ; st, sternum ; tn, trochantinal tendon ; x, ax- 

 shaped undetermined process. 



a, antero-external angle and (idem) articulation of the coxopodite; /3, postero- 

 internal angle and (idem) articulation of the coxopodite; 7, internal angle; 5, 

 internal articulation of the laterotergite; e, external articulation of the latero- 

 tergite. 



