202 



PLATE III. 



Fig. 18. The endophragmal system viewed from above. 

 On the right side the thoracic epimera have 

 been removed in order to display the endo- 

 pleurites. The following parts have also been 

 removed : The carapace, with the exception 

 of the anterior portion of the sub-hepatic 

 region ; the membranous roof of the branchial 

 chamber ; the abdomen ; the cephalothoracic 

 appendages (with the exception of the 

 mandibles) ; the gills ; and all the soft parts of 

 the body, x 1. 



Fig. 19. The sternum of the pre-oral cephalic region, 

 viewed from above. The dorsal part of the cara- 

 pace has been removed, as well as the pre-oral 

 cephalic appendages and the soft parts, x 2. 



Fig. 20. The sternum of the pre-oral cephalic region, 

 from below. The first and second antennae of 

 the left side have been removed to display their 

 sockets and muscle chambers. The long 

 peduncle of the left eye is shown, and also the 

 labrum. x 2. 



Fig. 21. Anterior and ventral view of the right chela. 

 The anterior wall of each segment has been 

 cut out, and the soft parts removed in order to 



display the tendons. 



2 

 3' 



Fig. 22. Posterior view of the basal portion of the second 

 walking leg (right side). The posterior wall 

 of the coxopodite has been removed in order to 

 display the tendons of that segment and also 

 of the basi-ischium. x 1. 



Fig. 23. Posterior view of the base of the last walking 

 leg of the right side. The posterior wall of the 

 coxopodite has been removed in order to 

 display the tendons of the coxopodite and of 

 the basi-ischium. x 1. 



PLATE IV. 



Fig. 24. Vertical section through the integument of a 

 soft crab, x 550. 



