and a new Representative of it, S. Claparedii. 5 



the tubular glands opens externally by a separate orifice (PL I. 

 figs. 10-14). 



With regard to the contents of the individual tubes, these 

 frequently consist of densely compressed, small, more or less 

 roundish, sharply defined corpuscles : these were seen by 

 Claparede; and Kolliker, as already stated, calls them '^ cell- 

 like structures.^^ Even by the employment of high powers I 

 could detect no nucleiform structures, or anything of the sort, 

 in the individual corpuscles. 



KoUiker's interpretation of the structures in question as 

 tubular glands is the only admissible one ; it is especially 

 founded on the above-mentioned opening of each tube sepa- 

 rately at the external surface. 



Thus (to return to the description of our little animal) we 

 have ten of these large globular glandular capsules surrounding 

 the periphery of the first segment of the body, and that of 

 each following one, in two transverse rows, one on the dorsal, 

 the other on the ventral surface. It is only on the last seg- 

 ments that the number diminishes by one or two capsules in 

 each row. Between the regular rows of these large cutaneous 

 appendages there are distributed over the whole surface of the 

 body a very great number of irregularly arranged smaller but 

 likewise globular capsules, the size of which varies greatly 

 among themselves. They all, like the above-described larger 

 structui'cs, represent cutaneous glands; and by their careful 

 examination we may, it appears to me, carry out the very in- 

 teresting observation of the complete development of the glan- 

 dular bodies in question. 1 have figured some of the principal 

 forms and stages of development, so far as the limited material 

 permitted this to be done (PI. I. figs. 3-9). The first (and 

 smallest) of these forms (fig. 3) represents a vesicle of only 

 0-009 millim. in diameter, in the interior of which a tolerably 

 sharply marked compact nucleus is situated : there are often two, 

 or even three of these nuclei ; but one of them is usually re- 

 markable for its size. A further-advanced form (fig. 4) shows 

 the vesicle enlarged to nearly double the diameter, as also the 

 enclosed nucleus, which has also become filled with a finely 

 granular substance. This type is also retained by the following 

 stage, except that the granular substance of the nucleus be- 

 comes more dense, and some granules shine out of it like dimly 

 lustrous globules. When a certain size has been attained, a 

 roundish perforation of the nuclear substance itself takes place 

 at some spot, usually near the periphery of the nucleus, so that 

 the nucleus appears as if pierced at this point. This first hole 

 is often followed by a second in close juxtaposition with it. As 

 this opening enlarges, the bridge situated towards the peri- 



