Notes on the morphology of the Tunicata. 517 



gives off numerous fibres which run directly to the ciliated epithelium 

 of the funnel. In this region of the funnel the basement membrane 

 of the ciliated epithelium is interrupted and the outer ends of the 

 cells show the same irregular character observed in BoUenia reni- 

 formis (cf. Plate 35, Fig. 21). Numerous ganglion cells are associated 

 with the fibres of this nerve which innervates the funnel. From the 

 funnel the duct leads back along the median line of the dorsal sur- 

 face of the ganglion, ending posteriorly in a bilobed tube which bends 

 down around the end of the ganglion (r.d of Figs. 26—28). This 

 is evidently the rudimentary rapheal duct. 



The duct which runs over the dorsal surface of the ganglion 

 branches at but one point, above the center of the ganglion (Fig. 26). 

 Here it sends off a great duct right and left, forming a cross. Each 

 arm of the cross is greatly branched, the branches forming the neural 

 gland. In the figure I have omitted those branches which extend dor- 

 sally, indicating them as if cut off at their origin from the transverse duct. 



In drawing Fig. 28, I distorted the true relation bringing into 

 the median plane portions of the funnel that in reality lie to the 

 right and do not appear in this section. The drawing would be ac- 

 curate for a sagittal section of an individual in which the funnel had 

 been straightened out, 



A rapheal nerve is present and is gangliated. Its origin is shown 

 in Fig. 28. 



Folycarpa v avians Heller. 



In this species the condition of the intersiphonal organs is the 

 same as in Folycarpa glomerata Ald., except that the branches of the 

 gland are longer and more slender (the ducts have the same cruci- 

 form arrangement) and the rudimentary rapheal duct extends a little 

 farther ventralward and has its furcse slightly longer than in the last 

 species. 



In both species of Tolycarpa I find a nerve assosiated with 

 numerous ganglion cells which pushes out from the antero-ventral 

 part of the ganglion on the median line. Its fibres seem to be 

 distributed in part a least to the wall of the pharynx along side of 

 the dorsal lamina. This gangliated nerve has the same position as 

 that which, in the Cionas and in Herdmania comes into such intimate 

 contact with and seems to innervate the duct of the gland near its 

 union with the funnel (cf. page 521 and Plate 36, Fig. 37). But in the 

 Polycarpas the duct and upper end of the funnel lie dorsal to the 



