142 



beneath the digestive gland and follows the course of the 

 gland to its extreme outer and posterior corner. Along 

 the outer edge of the digestive gland the lobe turns 

 upwards and covers the outer part of the dorsal portion 

 of the gland. Owing to its position beneath the digestive 

 gland the hepatic lobe is not readily seen, in spite of its 

 large size. Xear the origin of this lobe from the Main 

 Vesicle a small inner lobe is given off, which ends blindly 

 near the posterior oesophageal lobe. 



The Supra-hepatic lobe (fig. 57, s. /&., Text fig. 11, 

 S. H.} is not well developed in Cancer. It arises from 

 the Main Vesicle on the inner side of the origin of the 

 hepatic lobe, and passes above the digestive gland on 

 each side of the fore-gut. 



The Paragastric lobe (fig. 57, g. lb., Text fig. 11, 

 Pa?'.} arises from the posterior end of the Main Vesicle 

 near to the origin of the supra-hepatic lobe. Its outer 

 side is applied to the mandibular apophysis, and on its 

 inner side it comes into contact with the side wall of the 

 fore-gut. It passes up the side of the latter and 

 touches the epigastric lobe. 



The Oesophageal lobe arises from the inner and 

 posterior corner of the Main Vesicle. It passes inwards 

 and divides into anterior (as.lb.) and posterior (po.lb.) 

 portions which wrap around the oesophagus, touching 

 the corresponding lobe of the other side in the middle 

 line. 



In sections through a young crab (width of carapace 

 15 mm.) the epithelium of the bladder (PL XII, fig. 82) 

 consists of columnar cells 20/x long and 15yu wide. The 

 protoplasm is denser near the outer portion of each cell, 

 and the inner portion of the protoplasm is greatly vacuo- 

 lated. In the outer region of the cell the protoplasm is 

 arranged in longitudinal strands, which gives rise to the 



