70 ART. 4. — N. YATSU : 



VII., Fig. 105). The nerve fibres must be given off by ganglion 

 cells at first proximally and horizontally, but in what manner 

 they are produced and what course they subsequently take I 

 could not determine, since the preparations of the larvae made 

 according to the methyl-blue method were unsuccessful. I hope 

 to re-examine these points by other methods, such as silver or 

 gold impregnation, or lnematoxylin-methods. The posterior thread- 

 like prolongations of the most peripherally situated epithelial cells 

 just mentioned are attached to the supporting lamella already 

 secreted on the posterior face of the ganglion. The prolongation 

 is very fine and several of them come together in their course to 

 the supporting lamella, so as to form a bundle. In a transverse 

 section, therefore, the bundles come to look like islands arranged 

 with some regularity among the sections of nerve fibres. The 

 cells referred to as small ganglionic cells by Blochmann, which 

 are found in the adult scattered in the fibrous layer, have not 

 as yet made their appearance. 



Besides the central nervous system above mentioned the JY. 

 obUquorum (PI. VI., Fig. 82; PL VIL, Fig. 115, n. obi.) can be 

 seen in larvae of the 6-9 p. c. stage. It is a very fine cell 

 strand, a few nuclei appearing like the nodes of the fibre. It 

 spans the space between the body wall and the M. obliqui rnedii 

 (obi. md.). In some larvae of the 8 p. c. stage the nervus pedun- 

 cularis (n. pd.) is seen in the ventral view as a pair of white 

 lines (PI. VIL, Fig. 116) converging posteriorly to a point a 

 little to the right of the 31. occlusor posterior (occ. pst.). Brooks 

 ('78) has described (p. GO) and figured (PL IIL, Fig. 6) the 

 nerves, but he has apparently mistaken them for muscles (re- 

 tractor muscles). 



