80 



K. KISHINOUTE. 



Early in this stage some endoderm cells ucciimiihite at the 

 posterior end of the stomach and form the anterior part of the me- 

 senteron. These cells are arranged as a funnel-shaped tiihe \vid(; 

 open posteriorly. The posterior funnel hîis united with tlic wall of 

 the stercoral pocket at its hind end (tig. 55). The anterior and the 

 posterior funnels of the mesenteron do not at this stage unite with 

 each other. 



Locy says that on each side of the stomach are given off ca^ca, 

 which extend into the hases of the liml)s. lie adds that the cellular 

 elements comp(3sing the walls of these tubes are flattened ; hut he 

 gives no account concerning the time of their appearance Though I 

 have carefully examined embrycjs of all the stages, I could not And 

 such tubes. 



The proctodajum is lined with a cuticular covering as the stomo- 

 daäum ; but the stercoral pocket has no such covering. This fact 

 confirms my observation that the stercoral [)ocket is not a portion of 

 the proctodœum. The communication between them is formed at 

 this stage. The communicating canal is very narrow. In the last 

 stage, the stercoral pocket was somewhat globular in shape (PI. XIV, 

 fig. 32), now it is elongated anteriorly and is oblong (PI. XVI. 

 fig. 55). Its lateral diverticula have disappeared. 



I could not make out the development of the Malpighian tubes 

 satisfactorily ; but I am certain that they do not originate from the 

 ectoderm. Also it is certain that they are not outgrowths from the 

 stercoral pocket. It seems to me probal)le that they originate from 

 mesodermic cells belonging to the abdominal S(jmites in front of the 

 anal lobe. At this stage they are solid jjaired cords of cells (iig. 55, 

 ' j\[alp. t) extending from the anterior end of tlie second abdominal 

 segment to the sides of the confluent point of the posterior mesenteron 

 with the stercoral pocket. 



