602 PROCEEDINGS OF THE AMERICAN ACADEMY. 



cells, Avhic'li were first described by Do^nel ( : 02) as connected with 

 nerves of the branchial basket. Dogiel figures these cells as they ap- 

 pear in Golgi preparations, and states that in methylene-blue prepara- 

 tions he noted large round or oval nuclei on certain nerve branchlets 

 of the branchial basket, which he identifies as the nuclei of the cells 

 found in Golgi preparations of the branchial region. These "nuclei" 

 are shown in his Figur 16, taken from a methylene-blue preparation. 

 This figure shows a condition frequently present in my niethylene-l)lue 

 preparations. Comparatively smooth lines, darkly colored with 

 methylene blue, run parallel to the l^ranchial bars, but do not appear 

 to be connected with the evident nerves of the pharynx. Possibly 

 these may be blood vessels; at any rate the nerve cells (Figs. 19, 21) 

 which are impregnated with methylene blue in my preparations are 

 not connected with these lines, but with the branchial plexus. Fig- 

 ures 19, 21, and 30 show these cells in methylene-blue preparations, 

 and in a Golgi preparation. They correspond in shape and number 

 of processes to those described by Dogiel. The nuclei of the cells 

 impregnated with methylene blue are often difficult to discern, as is 

 frequently the case in other nerve cells impregnated more or less with 

 methylene blue. This led to the suggestion that these bodies might 

 themselves be nuclei. Upon measurement of these so-called cells, 

 and those impregnated after the method of Golgi, it was found that 

 the size in either preparation was practically the same, the bodies in 

 methylene-blue preparations being if anything, a little rounder and 

 fuller. In the Golgi preparation illustrated (Fig. 30) a lighter nucleus 

 is plainly visible in the multipolar cell. These cells are present on 

 both primary and secondary bars, and are present at least in the 

 ventral and side regions of the pharynx, on its external surface. In 

 the ventral region these cells are distributed in connection with the 

 elaborate plexus Avhich spreads ovev this portion of the branchial 

 basket. 



There are certain branches of the rami viscerales ascendentes 

 which are connected with the fan-like branches of these rami, but 

 apparently do not have the same ultimate destination (Fig. 15, c), 

 since they are lost to view in the region between the muscles and the 

 ligamentum denticulatum. Heymans et van der Stricht ('98) figure 

 nerve branches of the ascending visceral rami (PL VIII, Fig. 26, 

 ND]^.), which they designate as digestive and vascular, but the 

 destination of such branches has never been satisfactorily determined. 

 It is certain, however, that further experiments with methylene-blue 

 impregnation and other methods, will reveal many additional compli- 



