137 



light green colour, having a triangular shape when 

 viewed from above. At its posterior and inner corner it 

 is connected with the second portion the bladder 

 (" vessie," Marchal; " nephro-peritoneal sac," Weldon). 

 This is an extensive thin-walled sac having several large 

 branches. It is easily made out because of the dark 

 brown colour of its walls. Immediately in front of the 

 antennary gland the main portion of the bladder is 

 connected ventrally with the third part the ureter. 

 This is a spacious tube leading downwards and opening 

 to the exterior beneath the operculum, which is situated 

 on the ventral side of the basal portion of the second 

 antenna. 



(1) The Antennary Gland (PI. X, figs. 58, 59, 

 Text fig. 11) is made up of two portions. On the dorsal 

 side is a small vesicle the end sac [" saccule," Marchal] 

 (fig. 58, end. s., Text fig. 11, e.s.). From the floor of the 

 end sac are given off numerous blind prolongations, which 

 may either be simple or branched. 'The epithelium lining 

 the end sac (e.es.] is composed of flattened irregularly- 

 shaped cells, some of which project more than others into 

 the cavity of the end sac. Many of these cells contain 

 small yellow oil globules. Marchal speaks of the 

 epithelium of the end sac in Maia as being columnar, but 

 in Cancer it has a decidedly squamous appearance. 

 Marchal also states that the walls of the end sac are more 

 than one cell thick in places. This does not appear to be 

 the case in Cancer. The cells of the end-sac epithelium 

 do not stain so deeply as the epithelial cells of the lower 

 part of the antennary gland. 



The ventral portion of the antennary gland is much 

 larger than the dorsal end sac. In sections this lower 

 portion is seen to have a very complicated structure, and 

 is, therefore, known as the Labyrinth (fig. 58, Text fig. 11 ? 



