204 Journal of Comparative Neurology. 



bundle of fibers is found but the fibrils seem to form a felt or 

 basket work under the epithelium. Here and there anastomoses 

 are found. The ultimate distribution of the fibers in the cen- 

 tral system has not been proven. Some evidence however, 

 points to the fibers running under the peri-pharyngeal bands 

 and entering the ganglion by that course. 



No supporting cells ( Shitzellen of authors ) are found. 

 Many gland cells are stained. They usually take the stain less 

 intensely than the sensory cells and are large and irregular in 

 shape. ' 



The sensory cell in the endostyle of the Tunicates resem- 

 bles the general type of sensory bipolar cell as found in Oligo- 

 chaetes, Polychaetes, Crustacea, Mollusca, etc., and described 

 by Allen, Bethe, Gilchrist, Retzius, van Gehuchten, von Len- 

 hossek, vom Rath, etc. It, however, more closely resembles 

 the sensory cell in the olfactory epithelium of Myxine (Retzius). 



(2). Sensory endings in the branchial basket and peri-pharyn- 

 geal bands. 



The outer lip of the endostyle, as well as the outer lip of 

 the peri-pharyngeal bands, is covered with cubical ciliated epi- 



Fig. 2. Ciliated cells in the branchial basket. Cells selected by the blue 

 and show endings on the basal side. Ammonium picrate and glycerine. 1-12 

 imm. Oc. 6 (Zeiss). 



thelium. Certain of these cells are selected by the methylene 

 blue and stand out a vivid blue with the cilia also stained. Close 

 investigation often shows contact endings on such cells. Con- 

 tact endings of the same character appear on the basal side of 



