Notes on the morphology of the Tunlcata. 511 



posterior ends of the ganglion respectively. Both of these com- 

 municating ducts pass to the right of the ganglion. 



Cynthia carnea Verrill. 

 Plate 35, Figs. 17 and 18. 



We have here the same essential relations with, however, consider- 

 able modifications. The duct from the simple, circular funnel runs up 

 around the right side of the ganglion to the slightly developed gland, 

 which, of course, lies dorsal to the ganglion (Fig. 17). The lumen 

 of the gland contains many disintegrating cells. Posteriorly the 

 ventral or tubular portion of the epineural gland is continued ventrally 

 around the right side of the ganglion. While this is evidently the 

 homolog of the rapheal duct, it can only by courtesy be called by 

 this name, for, instead of running down into the raphe, it curls for- 

 ward under the ganglion and ends blindly at the upper end of the 

 raphe. The posterior end of the gland fuses with the ganglion as 

 shown in Fig. 18 /*. It is just at the right of this point of fusion 

 that the rapheal duct arises. 



About one-third of the way in front of the posterior end of the 

 ganglion a large gangliated nerve arises from its ventral surface, some- 

 what to the right of the median line, and runs down into the dorsal 

 raphe, having the usual relation to the rapheal nerve. 



Cynthia echinata L. 



This species, like the first two Cynthiae described has a very 

 long and slender ganglion which stretches forward beyond the ciliated 

 funnel, and backward beyond the upper end of the raphe. 



The funnel lies at the right of the ganglion, about one-fifth of 

 the length of the ganglion behind its anterior end. Its duct runs up 

 on the right of the brain to reach its dorsal surface, where it en- 

 larges into a good sized spindle-shaped chamber, more or less filled 

 with disintegrating cells which have been proliferated from the cubical 

 epithelium of its dorsal wall. This swelling is all there is to the 

 epineural gland proper. 



On the right side of the ganglion, one-fifth of its length from 

 its posterior end, the duct bends ventralward, having lost its glandular 

 character, and runs a short distance into the raphe, ending blindly. 

 It extends into the raphe only for a distance equal to the thickness 

 of five sections. 



Zool. Jahrb. Xlll. Abth. 1. Morph. 34. 



