SKI.l.KKS 0>| n.N. 



inrnt after being placed on a slide, although the writer has ob- 

 served tin-in beating I'm- live hours after the alimentary tract was 

 it-moved from the organism. Fig. 2 represents the character of 

 the epithelium and llagella in two adjoining ampullae. 



In Botryllns this organ was reported ciliated by Delia Yalle 

 (*8i) who wrote, p. 45*: "La struttura intima di questa glandola 

 e simplicis>ima trattadosi d'un semplice epitelio, che io ho 

 veduto sempre sfornito di cigli vibratili." He gives no figure. 



Pizon ('93) particularly mentions that he is unable to verify 

 Delia Yalle and finds the lumen of the ampulla? unciliated. There 

 are three other cases in which the pyloric gland has been found 

 ciliated Chandelon ('75) in Perophora, text Fig. I, Uljanin ('84) 

 in Doliolum. text Fig. 2 and Isert ('03) in Microcosm us. The 



FIG. i. 



FIG. 2. 



After Chandelon. After Uljanin. 



Ampulla? of the pyluric gland as seen in Doliolum and Perophora respectively. 



latter found tin- ductsand believed tin- ampulla- were ciliated too, 

 although he could not see it. The cases in which cilia have been 

 ,i in the ampulla- were all observed before the modern meth- 

 ods of mien.-! npic technique were evolved. Since then we have 

 been carried away by the use of dead material when in main 

 cases, perhap-, as much if not more could be -ecu in the living. 



Although the protoplasm of the \\.ilU of tin- duct- and ampulla- 

 seems to U- clear and refractive in the living animal, yel there are 

 here and there yellowish granules in thecells. These are exceedingly 

 minute, .1 to .2 n in diameter, and an- found in that portion ot 



