THE ANATOMY OF TANIA MEDIOUCANELLATA. 5 
gated granules which form an inter posing medium between 
it and the circular muscular coat. The skin is uniformly 
continuous from one segment to another ; thinned out it forms 
a preputial fold around the penis. No calcareous granules 
are present in it. 
Parenchyma.—Under this name I embrace the structures 
lying between the skin and the visceral space. The main 
component of this parenchyma is a soft, semi-transparent, 
granular, elastic, albuminoid material, very much cleared up 
by acetic acid or liquor potassze, studded with so-called “ cal- 
careous corpuscles,” and traversed by muscular and fibrous 
tissue bands. It is interposed as an uniform continuous 
mass between the skin and the visceral space (fig. 1, a; fig. 
3, a; fig. 16, a) averaging =; in. in thickness, somewhat less 
in amount at the junction of the segments, and somewhat in 
excess at the centre, also tapering off towards the edges. Next 
to the granular Su of the corium is a circular coat of 
badsemlat fibres =, in. thick (fig. 4, d) ; this coat for the first 
sooo In. from without inwards is free from all intercepting 
muscular bands, but beyond this is penetrated by fibres both 
longitudinal and transverse. ‘The transverse fibres (fig. 4, /) 
radiate from near the inner surface of the corium to the 
boundary of the visceral space (fig. 1, 6), the longitudinal 
ones are collected together in numbers averaging six, and 
form bands ;;!>5 in. in thickness (fig. 5, a), which traverse 
the segment from above downwards, aud are amassed together 
near the skin, where they form an all but continuous layer. 
Permeating also the parenchyma are delicate fibrous threads; 
these mainly run from one lateral edge of the segment to the 
other in a direction wanting in muscular layers. “Seated in 
excavations in the soft parenchyma are the granular inorganic 
concretions, ‘‘ calcareous corpuscles.” ‘These within the 
range of the circular muscular coat are comparatively few in 
number and small, but immediately beyond it they are larger, 
and are very thickly set in the body substance, decreasing in 
amount in the centre, but increasing again towards “the 
visceral boundary. Lying between the transverse muscular 
fibres they are arranged somewhat in linear series from the 
skin towards the visceral boundary, and the same feature 
pertains to the longitudinal bands. On each side of the 
sheath of the penis the granules are in excess, but where the 
one segment joins the other they are in diminished numbers. 
Three kinds can be observed—(1) Spherical or ovoidal 
nodules, average +255 in. in diameter, light brown in colour, 
composed of concentric lamine arranged around a darker 
nucleus occasionally, gradually disappearing after a lengthened 
