166 
the limbs of which lie over each other and are terminated into the 
hollow of the first pair of coxae, perhaps taking their origin here 
(pl VI 7 & 8, fig. 14). Whether the said glands are tubes, or 
solid bodies, I have nor been able to investigate with certainty. 
At least they consist of å gréat number of nucleated cells and are 
shaped completely differently from the coxal glands; on account of 
which I do not identify them with coxal glands. 
Glandular Ducts. 1 prefer to describe here a singulår system 
of chitinous tubes which connect: the mouth with the first pair of 
the coxae, because they are probably glandular ducts, perhaps those 
of the said glands. These ducts begin (pl. IV fig. 19 ) at the hind- 
most part of the first pair of coxae right under the sternum with 
a swollen part; the finely granular walls of which are partly covered 
by chitinous prolongations from the coxae (c); each tube grows thinner 
and is directed inwards and forwards, so that the two tubes touch 
each other and discharge into a common duct (g). This common 
duct is mounted with many thickenings, the one facing the other 
and connected with distinet cbitinous rings. The meaning of this 
ringed structure is certainly this, that a stiff tube is avoided, which 
would incommodåte the flexibility of the  articulation membrane of 
the pseudocapitulum, where it is placed. This ringed tube is 
continued as (pl. VI fig. 6 tu) a stiff one' along the floor of 
the pharyngeal tube, finishing here between the two small inner 
latera] lobes. 
Heart. In the front pårt of the abdomen along the back of 
the ventricle and between the inner longitudinal bands there is an 
elongated thin-walled and narrow tube. Its position makes it natural 
to regard it as a heart; the material at my disposal is not sufficient 
to settle the question; I have only seen: it in longitudinal and 
transverse sections. 
Clear dorsal Sack. Closely under the dorsal skin and very 
often visible through it as a clear spot a hollow body is placed 2 
little pointed behind; it is coloured with hæmatoxylin, but I cannot 
see any nuclei. It seems to be ehitinous (pl. VI fig. 2 & 10 m). 
