Coxal glands of the Arachnids. 267 



Explauation of Plates. 



Part I. Pulmonate Arachnids. 



C Coeca of intestinal tract GN Ganglion 



CA Coxal Artery LET External tubule of labyrinth 



CL Coxal labyrinth LIT Internal tubule of labyrinth 



CSL Central lumen of saccule LO Lymphatic organ 



CT CoUecting tubule M Muscle 



D Diaphragm N Nerve 



END Endosternite Outlet 



ET Exit tubule S Saccule 



EXT External surfäce V Vesicle 



G Genital duct VS Ventral sinus 



GL Glomus VTL Ventral tubule 



GLR Glomeruli 



The photographs are so arranged that on reading the lettering, the 

 dorsal side of the specimen is uppermost in sagittal and transverse sections, 

 and the anterior end is uppermost in frontal sections. 



Scorpions. 



Plate 1. 



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



Coxal gland showing the saccule surrounded by the labyrinth 

 coils. The coxal artery (CA) enters the saccule (S), and on 

 the right the lumen of the saccule passes into the labyrinth 

 tubule (GL). Below on the left is appendage V with its nerve 

 (N) and artery (AV). 



From AV runs the coxal artery (CA) to the saccule. 



The diaphragm (D) runs vertically across the field just posterior 

 to the coxal gland. On the right of D is the abdomen with its 

 intestinal coeca (C) filled with globules of nutrient matter. The 

 lymphatic organ lies more internally and does not appear in this 

 section. 



