294 



K. KISHINOUYE. 



cœlomic cavity of tlie gland is so small at this stage that the gland 

 seems almost solid. In the ahdomen also, all the C(Blomic r-avities 

 disappear except the unpaired one in the caudal lobe, which, inexpli- 

 cable as it may seem, remains as the stercoral pocket, as was described 

 and figured in my former paper. At this stage the mesoderm cells .at 

 the intersegmental portions grow inward into the yolk and form the 

 dissepiments, these, being specially well developed between the second 

 and the third, the third and the fourth, the fifth and the sixth 

 abdominal segments (Fig. 12). 



Those portions of the embryo which were destitute of the meso- 

 derm in the stage of Fig. Î) now dwindk^, according as they are 

 encroached on either liy the ^-entrai jilate (^r by the aljdominal terga in 

 their growth: in the céphalothorax, the cephalic lobe is bent towards 

 the dorsum and its lateral margins fnse with tliose of the ventral plate 

 of the thorax, Avhile in the ventral jwrtion of both the céphalothorax 

 and the abdomen, the two lateral cords of the nervous system with 

 the underlying mesoderm meet each other at the ventral median line. 



