048 T. TKEDA : 



Numerous uuifclliiLir glands are found in the Actinotrocha not 

 only all over the two surfaces of the preoral lobe, l3ut also in the 

 oesophageal wall as well as in the inner ectoblastic wall of the 

 ventral pouch. They are also, though less ahundantly, distributed 

 over both the collar wall and the tentacular wall. The glandular 

 cells are all pear-shaped, the nucleus being found always oppressed 

 to the base of the cell (figs. 49 and fiicJ, in.gl.). In their 

 staining reactions, the secretory contents of the glands agree with 

 those of mucin. Tt has been often noticed that living larvdo 

 remain adhereing to the objects they have touched with the hood, 

 and that metamorphosed larvfc behave similarly with the tip of 

 the e vagina ted pouch. 



There exists still another, paired, multicellular gland ^vhich 

 is observed only in the larva^ of type C (figs. 1"), gld. and fig. lr)c). 

 Tt is situated on 1)oth sides of the median line on the upper sur- 

 face, and somewhat near, the neck of the preoral lobe. Tt has the 

 shape of a round flask with a short neck (fig. 1") e). The appeai'- 

 ance of the section through the body of this gland reminds us of 

 the chorda dorsalis in Vertebrate embryos : it presents to view a 

 mesh-work of protoplasm, a small numl)er of nuclei behig found 

 here and there closely pressed against the rc^ticular beams or the 

 nodes of these (figs. 50 a-c)."' Each of the meshes corresponds to 

 one gland cell. In fig. o6 h, which shows an oblique median 

 section of the body of the gland, a comparatively wide round 

 space exists in the centre, surrounded by the gland cells which 

 are arranged more or less radially. This space, when traced \\\)- 

 wards, passes into a short and very narrow tubular canal, finally 

 to lead to the exterioi- by a small aperture (Fig. f50 c). Since 



* Bv nn >inf()rli)nnte ovcrsit^'lil, Fi<4'. 50/^ Ikis liail its miinlu'i- oniittod in the plate, 



