Galloway, Budding in Dcro vaga. 219 



and 2, cl. I. n.) the dorsal band, those fibers from the lateral 

 line to the ventral bristle sacs, the lateral bands {mu. I.), and 

 the remainder, the ventral band (imi. v.), we shall be able to lo- 

 cate the ingrowths in a more satisfactory manner. A series of 

 ectodermic ingrowths occurs on either side between the lateral 

 and ventral bands. We may neglect these as they do not con- 

 tribute to the formation of nervous structures, unless possibly 



cXilJ 



CcVjjJC^Xjjf 



-^t /, 



Fig. 2. Transverse section of Dero, showing arrangement of nervous 

 structures in head of posterior zooid. Lettering as in Fig. i. 



they give rise to the small visceral ganglia lying upon the phar- 

 ynx, which may be deposited as the lateral ectodermal sulci of 

 the buccal cavity are infolded. With regard to the origin of 

 these ganglia my evidence is as yet unsatisfactory. 



The spaces between the dorsal and lateral bands are 

 normally occupied by the cells of the lateral line, which have 



