Coxal glands of the Arachnids. 269 



Below the lymphatic organ is the large ventral sinus (VS). 

 The saccule lies more externally and is not visible. 



Fig. 6a. Diplocentrus scaber (Scorpionid). Sagittal. 100 : 1. 



Lymphatic organ and coxal labyrinth as in 6. The ventral 

 sinus is only partially seen. 



Plate 6. 



Fig. 6b. Euscorpms italiciis (Chactid). Sagittal. 100 : 1. 



Lymphatic organ as in 6. In Euscorpius the lymphatic organ 



is extensive and somewhat coiled upon itself. One of the large 



binucleated nephrocytes is clearly seen in the ventral sinus. {BR) 



is a part of the suboesophageal ganglion. 



Fig. 6c. Scorpio inaurus (Scorpionid). Young with mother. 100 : 1. 



Lymphatic organ and ventral sinus. 



Pedipalps. 



Plate 7. 



Fig. 7. Taraniula palmata. Sagittal. 100 : 1. 



Coxal gland. General view showing the saccule (5), the three 

 divisions of the labyrinth {CLa, CLm, CLp), and the straight 

 return ventral tubule (VTL) leading to the exit tubule (ET) 

 and outlet on appendage III. 



Fig. 7a. Tarantula •pcihtaia. Sagittal. 100:1. 



Coxal gland. Similar view to that of 7, taken from another 

 specimen. The central lumen of the saccule (CSL) narrowing 

 above to form the collecting tubule, is better shown than in 7. 

 C. in, C. IV, C. V, are the coeca corresponding to the appendages 



below. 



Plate 8. 



Fig. 8. Tarantula palmata. Sagittal. 300 : 1. 



The exit tubule, more highly magnified. 

 Fig. 9. Tarantula palmata. Transverse. 250 : 1. 



The saccule with the inhanging glomeruli and central lumen 

 {CSL) with the collecting tubule {GT) leading into the 

 labyrinth {CL). 



Below, on the left of ^the saccule, is the beginning of the exit 

 tubule. The glomeruli can be better distinguished in 9b. The 

 small spherical nuclei belong to the cells lining the lumina of 

 the saccule. 



