206 



nine gills ars shown. On the right side the 

 epimeral wall has been removed in order to 

 show the course of the branchio-cardiac veins, 

 and also to show the connection between the 

 latter and the pericardium. x 1. 



Fig. 55. A dissection of the epimeral region of the 

 thorax from the right side, in order to show 

 the positions of the branchial sinuses, the 

 infra-branchial sinus, the afferent branchial 

 sinuses, and also the sinuses coming from the 

 thoracic legs, x 1. 



Fig. 56. Diagrammatic section through the thorax in 

 the region of the heart, to show the blood 

 system and the general arrangement of the , 

 organs. The tendons of the first walking legs 

 are shown, x i. 



PLATE X. 



Fig. 57. Dissection of the left side to show the exten- 

 sions of the bladder. The dorsal region of the 

 carapace has been removed. The fore-gut has 

 been cut through at the oesophagus and 

 removed. The gonads and the digestive gland 

 have also been taken away. The antennary 

 gland is represented by a dotted circle, x 1. 



Fig. 58. Semi-diagrammatic sagittal (vertical longi- 

 tudinal) section of the antennary gland. The 

 anterior part of the gland is to the right, 

 x 60. 



Fig. 59. Detailed drawing of part of previous figure, 

 showing the epithelial cells of the bladder, end 

 sac and the renal tubule, x 90. 



Fig. 60. Section through the mass of cutaneous glands 

 opening on to the epistoma. x 210. 



Fig. 61. Section showing the epithelial cells of the mid- 

 gut, with characteristic striated border, x 550. 



Fig. 62. Longitudinal section through part of the wall 

 of the hind-gut, about the middle of the 

 abdomen, showing cutaneous glands, x 165. 



