44 ART. S. 1. IKEDA : THREE NEW AND 



appearance of the tissue. The bauds run all along the lateral 

 margins of the proboscis, just beneath that ventro-lateral zone 

 of the epidermis where this consists of considerably taller cells 

 than in any other parts of it. The mesenchyme cells in the 

 bands differ in no way from those in more strictly subdermal 

 situations, but what gives to the tissue its distinctive appearance 

 is the fact that the mesh-like intercellular spaces are taken up 

 by the wandering cells present in a large number. 



In the mesenchyme space, peripheral as well as deeply 

 situated, are present pigment granules in abundance. To their 

 peculiar distribution is due the brownish markings of the pro- 

 boscis. Observed under the microscope, the granules are of 

 various sizes and appear greenish yellow in color. They are 

 generally arranged in irregular streaks, mostly around and along 

 those connective-tissue fibers that extend in dorso-ventral direc- 

 tion in the thickness of the proboscis (fig. 44. ])g.g.). 



Of the muscles that traverse the mesenchyme space, there 

 are to be mentioned, in the first place, those muscle fibers 

 that run in the longitudinal direction. These are arranged in 

 numerous, small and separately running bundles (figs. 44 and 

 47, m.f.bl), which show each a delicate sarcolemma-like en- 

 velope. Certain other muscle fibers, especially those that take 

 dorso-ventral course, do not form themselves into bundles but 

 run singly. Nevertheless, even these isolated muscle fibers can 

 be readily distinguished from the connective-tissue fibers in that 

 they show a finely fibrillar structure. A special system of 

 fine muscle (fig. 43, m.f.) branch off from the circular system 

 of the ventral dermal, musculature, on each side of the pro- 

 boscis at a point about midway between the lateral vessel and 

 the lateral margin. It proceeds obliquely U2:>wards and towards 



