PLATE VII. (continued.) 



Fig. 93. The 109th section ; this passes through the abdominal ganglion at the 

 place of its connection with the ectoderm lining the median wall of 

 the mantle cavity. It also shows a portion of the connective from 

 the abdominal ganglion to the left visceral ganglion. 



" 94. The 146th section of the series ; it shows a cross section of the neck of the 

 cerebral invagination, and a small portion of the cerebral ganglion of 

 the left side. 



" 95. The left surface of the 54th section, from an individual of the fourteenth 

 day. The section passes through the right visceral and the abdomi- 

 nal ganglia, showing their close connection with each other at this 

 time, and it also cuts the right buccal ganglion. The material was 

 killed in Perenyi's fluid, and stained in picro-carminate of lithium. 



The following figures are drawn from sections of the same series as 

 Fig. 95 : Plate VIII. Figs. 96, 101, 102 ; Plate IX. Fig. 114. The 

 sequence of sections is this: — 



Section 52, 54, 56, 66, 82 . 



Figure 101, 95, 102, 114, 96. 



