526 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



belonging to the end sac. The cells are still squamous 

 but much smaller, so the nuclei appear to be side by side 

 in straight rows. The border of the cells is regular and 

 without the lobed appearance which characterises that of 

 the end sac. The cytoplasm is scanty and striated; it 

 stains more strongly than that of the end sac. The 

 labyrinth communicates by a narrow passage with the 

 rest of the system. 



2. The Anterior Vesicular Mass (Marchal)* com- 

 prises that portion of the system apart from the 

 antennary gland, which lies in the thorax and cephalon. 



The opening of the whole to the exterior is connected 

 with this part of the system. The passage commences 

 close to the connection with the antennary gland. It is 

 at first wide, but rapidly becomes narrow, and passes 

 downwards underneath the second antenna, where the 

 external orifice is situated (fig. 30). 



The arrangement of the Anterior Vesicular Mass is 

 as follows : — The canal from each gland expands into a 

 mass of ramifying tubules in front of the stomach 

 (epigastric lobe). . Although these two masses are close 

 together in the mid-line, they do not communicate with 

 one another. From each epigastric mass {eg. I.) a narrow 

 branching canal runs backwards, closely applied to the 

 muscles, to join another mass of arborescent tubules 

 situated on either side of the stomach opposite to the 

 depression between the cardiac and pyloric ossicle of the 

 gastric mill. Branches from these two lateral para- 

 gastric masses (pg. I.) pass across the stomach in the 

 above-mentioned depression to meet, but not to coalesce, 

 in the mid-line {sg. I.). 



Underneath the stomach is a median unpaired 



* Archiv. de zool. experim. et gen., Ser. 2, Vol. X, 1892, p. 57. 



