166 



accummulation of mucous glands [m.g.) which are densely packed 

 between the two regions (the space beneath the lower ganglion cells 

 and mucous glands was produced by reagents). The behavior of these 

 glandular structures toward stains, just as in similar structures away 

 from this region, indicates their mucous character. The hypodermis 

 {h.y) consists of a layer of elongated spindle-shaped cells closely united 

 on the ventral side but extending upward into the gland structures in 

 an irregular manner. The direction of these cells in the hypodermis 

 underlying the nerve cord is upward and outward on either side of the 

 median line so that in the latter plane [m] the hypodermis is always 

 thinnest. The slant of the cells depends very much upon the region 

 from which the section is taken. In sections through the ganglia in 

 the hypodermis directly beneath it, the cells are much less slanting 

 than in sections through the cord between the ganglia, w'here in some 



7uC, 772^, 



m.ff. 



..y. 



cases the cells nearest the median line seem to lie almost horizontal. 

 The thickness of the hypodermis in the region of and away from the 

 ganglia also differs considerably. Directly underneath the ganglia the 

 hypodermis is quite thick, its cells are very much elongated, particu- 

 larly near the median line, and in some places, as is represented on 

 the left side of the figure [h.c.)^ they form rather thick clusters. To 

 the side of the ganglion and beneath the longitudinal muscle bands 

 (/,w.) the cells assume the character of the hypodermal cells of other 

 regions. The ganglion cells occupying the dorsal [g.c] and the ventral 

 sides of the nerve cord [g.c.) can readily be distinguished by their po- 

 sition and the absence of distinct cell outlines. The nuclei appear 

 crowded together in a somewhat homogenous tissue which on the ven- 

 tral side of the cord spreads over and dips down into the interstices of 

 the gland structures, so that in some sections nuclei may be seen lying 



