Cotylogastor occidcntalis n. sp. 603 



generu of this family cxcept Stichocotyle •). They arc hovvevcr prob- 

 ably larger and niore favorable for investigation in ü. occiäcnialis 

 than in eitber of the other nienibers of tbe family in wbich tbcy 

 have been observed. The bulb of the one represented in Fig. 1 1 

 nieasures 38 X 27 /< and the total length from the base of the organ 

 to its opening at the surface 55 ^i. They correspond in position 

 with the similar organs of Asindogaster, Cotylaspis and CotyJogaster 

 michaelis lying at the raargin of the sucker one in the outer end of 

 each Septem betvveen the marginal alveoli. The body of the organ is 

 ovoidal in shape and is connected with the exterior by a narrow 

 tortuous duct. Starting from the outer end of the bulb the duct 

 bends sharply downward by its side and then makes a second turn 

 toward the surface of the body where it opens (Fig. 14). The organ 

 is limited by a delicate membrane outside of which is a layer of 

 tibrous tissue and the parenchyma. The duct to the exterior has the 

 same coverings and its terminal portion is lined by a cuticula directly 

 continuous with that covering the body of the worm. This ends ab= 

 ruptly about one third of its length in ward from the surface (Fig. 11). 

 The interior of the bulb is raade up of a material which differs 

 markedly in different organs ranging from a coarsely vesicular to a 

 finely granulär condition (cf. Figs. 11 — 14). This I interpret as the 

 cytoplasm of glandulär cells in different states of activity notwith- 

 standing the fact that no nuclei are discernible in it, with the ex- 

 ception of nuclei of nerve cells to be described later. In the absence 

 of visible nuclei it is impossible to say whether each organ is made 

 up of one large glandulär cell or of several. At the deeper end of 

 the bulb the sheaths are pierced by a bündle of delicate fibrous 

 material which in some cases can be traced back through the par- 

 enchyma for a considerable distance and is without doubt a bündle 

 of nerve fibers. Its size would indicate a very strong innervation of 

 the organ although by the method employed (HgClg-Iron-Haemato- 

 xylin) nothing could be learned concerning their ultimate distribution. 

 In mauy cases a number of bipolar cells are clearly shown entering 

 the side of the organ next the convoluted portion of the duct and 

 extending for short distances apparently along the surface of the 

 gland cells. These I regard as undoubtedly sensory nerve cells 

 though the exact method and place of their termination could not be 

 made out. The fact that they are always on the side of the organ 



1) List of genera on page 612. 



