268 B. H. BuxTON, 



Fig. la. Bnthus australis. Imruature. Sagittal. 100 : 1. 



A view of the coxal gland corresponding to that of 1. The 

 difference in the size of nuclei and cells in the two different 

 species is noteworthy. 



Plate 2. 



Fig. Ib. Vejovis fl.avies. Sagittal. 300 : 1. 



Coxal gland. Passage of saccule into labyrinth. 



A part of photograph 1, more highly magnified. 

 Fig. Ic. Buthns occitanus. Adult. 200 : 1. 



Coxal gland. Passage of saccule into labyrinth. The striated 

 part of the labyrinth cells is stained black with iron hematoxylin. 



Plate 3. 



Fig. 2. Biälms occitanus. Young with mother. Sagittal. 300 : 1. 



Vesicular part of coxal gland with exit tubule {ET) and 



outlet (0), {EXT) is the exterior between appendages V and VI. 



Fig. 3. Centrurns margaritatus. Egg just before birth. Frontal. 



225: 1. 



Coxal gland with dip of labyrinth coils almost to surface {EXT) 



on appendage VI. The saccule does not appear in this section. 



Fig. 4. Buthns occitctnus. Young with mother. Sagittal. 250 : 1. 



Shows the whole course of the coxal artery {CA) from the 



artery of appendage V to the saccule, where it breaks up into 



the glomus {GL). 



(0 in brackets) indicates the position of the outlet. 



Plate 4. 



Fig. 5. ButMis occitamts. Adult. 200 : 1. 



The glomus {GL) forraed at the entrance of the coxal artery 

 into the saccule {S). Compare with {GL) in the young scorpion, 

 photograph 4. 

 Fig. 5a. Vejovis fJaries. Sagittal. 250 : 1. 



A part of photograph 1 more highly magnified , showing the 

 coxal artery {CA) entering the saccule {S) and breaking up 

 into the glomus {GL). 

 Fig. 5b. Bnthus occitanus. Adult. 300 : 1 . 



From the same specimen as photograph 5 to show the striation 

 of the labyrinth cells under a higher magnification. 



Plate 5. 



Fig. 6. Vejovis flavies. Sagittal. 100 : 1. 



The lymphatic organ {LG) lying in the abdomen and opening 

 through the diaphragm (Z)) into the capsule of the coxal gland. 



