10 ART. 4. 1. TKEDA : 



400 hir(f' (near the Okinosé bank) in the Sagami Sea. The 

 following description is liased on that specimen which is preserved 

 in formalin. 



The worm is of a moderate size and of a brownish yellow 

 color. The body proper is about 4.5 cm. in length and 7 7nm. in 

 maximum width, it being posteriorly narrowed into a small and 

 slender tail-process (Fig. 4). The introvert, which had partly 

 retracted, is apparently about as long as the body proper, but 

 much narrower, averaging 3 mm. in width. The skin-surface 

 appears smooth to the naked eye, but under certain magnification 

 numberless prominent papillœ may be discovered. They are largest 

 and tallest in the posterior region of the body, reaching up to 

 0.08 mm. in height and 0.03 mm. in thickness (Fig. 34). They are 

 of a brownish yellow color and are composed of very small, closely 

 aggregated, chitinous granules, 'i'he papillse become gradually 

 shorter and shorter towards the base of the introvert, in which 

 parts they are represented by flat bodies separated from one another 

 by irregular narrow grooves (Fig. 35). The latter form a sort of 

 mesh-work, in the meshes of which is contained a papillary body. 

 Each body is formed of a small granular ring of a brownish yellow 

 color and of a colorless transparent central area containing the 

 small external aperture of the subdermal gland. The granular 

 ring measures about 0.03 mm. in diameter. Towards the middle 

 and anterior parts of the introvert, the papillae again become 

 nearly as large and long as in the posterior parts of the body. 

 In the regions of the introvert mentioned, the chitinous layer of 

 the skin shows fine striations intersecting at right angles. No 

 hook or spine, nor eye-spot, is present. Peculiar structures are 



* 1 liiro= about 5 feet. 



