270 S- H. Buxton, 



Plate 9. 



Fig. 9a. Tarantula jyalmata. Transverse. 250 : 1. 



Similar view to that of 9, but taken from another specimen. 

 Fig. 9b. Tarantula fuscimana. Transverse. 225 : 1. 



Similar view to those of 9, and 9a. The cells lining the 

 collecting tubule are peculiar in that the nuclei lie on the free 

 border of the tall cylindrical cells. 



This peculiarity is seen best in 9b. A part of the exit tubule 

 {ET) can be seen below the saccule. 



Plate 10. 



Fig. 9c. Tarantula fuscimana. Transverse. 75 : 1. 



Compound of two photographs taken from the same specimen 

 eight sections apart, just posterior to appendage III. 



The anterior part of the coxal gland with saccule, collecting 

 tubule, exit tubule and anterior division of the labyrinth lies on 

 either side of the enormously developed brain, pierced by the 

 narrow oesophagus. 

 Fig. 10. Tarantula palmata. Transverse. 400 : 1. 



A transverse section across the middle division of the labyrinth 

 to show the cylindrical, slightly basophil cells, and the blood 

 channels running between the tubules. 

 Fig. 11. Tarantula palmata. Transverse. 100:1. 



A transverse section taken near the middle of the coxal gland 

 to show the relation of the labyrinth {CL) to the ventral sinus 

 {VS) and the straight return ventral tubule (VTL). The 

 ventral sinus lies close to the endosternite, internal to the ventral 

 tubule. From the sinus blood channels run between the coils of 

 the labyrinth. 



Plate 11. 



Fig. 12. Tarantula fuscimana. Sagittal. 100 : 1. 



The coxal labyrinth with its three divisions lying dorsal to 

 the large ventral sinus (VS). Below the sinus is the endo- 

 sternite (END). The basophil cylindrical cells of CLm can be 

 clearly distinguished from those of CLp and CLa. 

 Fig. 12a. Tarantula palmata. Sagittal. 100 : 1. 



Similar view to that shown in 11. 



The cells of CLm are clearly columnar but not so basophil 

 as is usual. Compare with 7a "from the same specimen. 1 1 and 

 11a are taken from sections lying more internally than 7 and 7a. 

 The saccule and ventral tubule lie externally and are not seen. 



