526 MAYNARD M. METCALF, 



Beyond the gland, the duct leads back a short distance and then 

 becomes fused with an outgrowth from the ganglion, until the two 

 are indistinguishable. The cells of this common mass extend still 

 further back and then bend sharply downward to run into the raphe. 

 The cellular cord is evidently ganglionic in its nature and is ac- 

 companied by a small bundle of nerve fibres which branch off from 

 the right posterior siphonal nerve. 



This prolongation of the common mass of cells produced by the 

 fusion of ganglion and gland was seen also in DistaxMa (Fig, 46) 

 and was very plainly seen in Ascidia mentula (Plate 34, Fig. 4). 

 Reference will be made later to the great variety of relations between 

 the rapheal duct, the rapheal nerve, and the gland and ganglion (cf. 

 page 513). 



Amaroecium steUatum Verrill and Amaroecium pellucidum Ver- 

 RiLL agree with Amaroecium consiellatum in the character of their 

 intersiphonal organs. One could not tell, without knowing the history 

 of its preparation, from which of the three forms the section figured 

 was taken. 



Fragaroides aurantiacuin Maurice. 



This species which has been so fully described by Maurice^) 

 shows almost exactly similar relations. With one modification, Fig. 47 

 would serve for this species also. In Fragaroides, the lumen in the 

 backward prolongation of the duct of the neural gland extends a little 

 further into the rod of cells which accompanies the fibres of the 

 rapheal nerve. Maurice's figure and description are very slightly 

 inaccurate in one particular. He describes the rapheal nerve (his 

 "cordon ganglionnaire viscéral") as arising from the cortex of the 

 ganglion alone, instead of from a common mass of cells formed by 

 the union of an outgrowth from the ganglion with the backward pro- 

 longation of the duct of the gland. 



The gland cells of Fragaroides are either vesicular, like those of 

 Amaroecium, or they may show one or more paranuclear bodies 

 similar to those of Polycyclus (Plate 37, Fig. 48). I have found as 

 many as seven of these bodies in a single cell. The presence of both 

 vesicular cells and those with paranuclear bodies in the same gland 



1) Maukice, 1888. 



