580 



MAYNARD M. METCALF, 



between the pharyngeal or cloacal epithelium and the muscles, which 

 in this species are aboundant. The accompanying figure (Text-Fig. H) 

 shows two pharyngeal glands, which lie at the side of the neural 

 gland. The openings (o) connect each with a duct, which apparently 

 is lined by an involution of the pharyngeal epithelium. The duct is 

 branched, as is seen, opposite the points x and y. The bulk of 

 the gland is not composed of ramifying tubules, but is formed by 

 cells aggregated in loose masses or in strings, which apparently are 



formed by proliferation 

 from the cells forming 

 the walls of the duct. 

 These masses or strings 

 are not distinct, but fuse 

 with one another, giving 

 the whole gland a spongy 

 appearance. As is seen 

 at the point ^, the glan- 

 dular cells connected with 

 one duct may frequently 

 be continuous with those 

 connected with another 

 duct. The glands them- 

 selves, then, are not al- 

 ways separate, but may 

 often be fused with ane 

 another. 





1 



■Eg ^^J:.^' 



T/^i,^: ■■-.%<& -ÎÈ5-/© 



\y^ The glands of the 



pharynx do not differ in 

 any way from those of 

 the cloaca. 



The larger of the 

 glands shown in the figure 

 is the largest I have 

 found. Most are of the 

 size of the smaller gland 

 figured, or intermediate 

 in size between the two. 

 These two glands lay in the intersiphonal area, at the left of the 

 ganglion and neural gland. 



I have not determined the nature of these organs, or the character 



Fig.l.H. Section perpeudicular to the surface of 

 the pharynx of Styela aggregata var. americana (?), in 

 the neighborhood of the ganglion, showing two pharyn- 

 geal glands. X 6*^^ diameters, o opening of duct,pÄ 

 pharyntrcal epitheliuno, x and y points where the duct 

 branches, z region where the two glands unite. 



