CRUSTACEAN LEG SEGMENTS — CARPENTIER & BARLET IO7 



on entomology do not show the furcal apophysis connected with a 

 postpleural process but rather with the process of the (medio) pleural 

 apodeme. However, the coexistence of the two kinds of processes 

 has been observed in such insects as Sialis (Weber, 1928, fig. 14^; 

 Czihak, 1953, fig. /) and in Lepidoptera (Weber, 1928, figs, i" 



tn-nt 



ecl-nt 



tr-an 



Figs. 4 and 5. 



Fig. 4.— Basal region of the 3cl right thoracic limb of Pcnariis caranwtc Risso, 



setae omitted. 



Fig. s.— Basal region of the prothoracic limb of a machilid. (Figure based 



especially on Petrobius.) 



The two figures show the internal side, with the endosternite and some par- 

 ticularly interesting muscles (drawn with a single line). 



an anapleuron or anapleural pleurite; a^ pleural apodeme; bp-ca, muscle gomg 

 to the carpopodite, homologous with a tibiatrochanter muscle m the msects; 

 bp-d other depressor of the basipodite ; bp-f, levator muscle of the basipodite, 

 homologous with a trochantero-furcal muscle of the insects; bp-nt, depressor 

 of the basipodite, homologous with a trochantero-notal (epmieral) muscle m 

 the insects; cp, catapleuron; ex, coxopodite or coxa; d, e, f, h, k, p arms 

 of the endosternite homologized in the Apterygota; ed-nt. endosterno-notal mus- 

 cle- sa superior arms (not homologized in the Apterygota); st, stermte; tn, 

 trochantin or its tendon; in-nt, trochantino-notal muscles; tr, trochanter; U-an. 

 trochantero-anapleural muscle; U-nt. trochantero-notal muscle. 



