420 SIR WILLIAM TURNER 
in character, though in others it was more translucent. The spaces were frequently 
devoid of contents, though in some sections irregular fragments, granular in appearance 
and possibly a coagulated substance, were present. The dorsal and ventral spaces, not 
only in relation to this, but to other divisions of the alimentary canal, formed the 
ccelom or body cavity. Koren and DaNnIELssEN named the dorsal space the dorsal 
canal, and stated that during life it was full of red thinly-flowing blood. 
The chitinous wall was lined by a definite membrane, in which was a layer a large 
stellate cells, full of a rich purplish-black pigment. 
The alimentary canal and the associated spaces retained the characters just described 
as far down the body as where the attenuated thoracic part was continued into the 
genito-abdominal segment, in which the chitinous wall also possessed a lining 
membrane with large richly-pigmented cells. The alimentary canal was in the axis 
of the segment, and its transverse section was almost round, and so capacious that it 
may properly be regarded as the stomach. ach lateral aspect was attached to the 
adjoiing pigmented membrane by a mesentery. The dorsal and ventral spaces were 
relatively small. Between the canal and the sides of the chitinous wall the upper ends 
of the two ovaries were situated (fig. 17). 
Somewhat lower in the genito-abdominal segment the alimentary canal had a 
reniform outline in transverse section. In proximity to the genital orifices it was 
compressed dorsi-ventrally, and the opposite walls were almost in contact. In some 
sections the canal gave origin at a lateral angle to one and occasionally more diverticular 
prolongations, the lumen in which was continuous with that of the canal (figs. 20, 21, 
22). At its lateral angles the wall of the canal was attached to the pigmented lining 
of the chitinous wall by fibres, apparently non-striped muscle, which formed lateral 
mesenteries, and the fibres formed a loose network, in the meshes of which, as well as in 
the interspaces of the pigmented membrane, were nucleated cells, some scattered, others 
in clusters, many of which resembled leucocytes, though others were elongated, caudate, 
and stellate, not unlike the corpuscles of connective tissue. 
In the genito-abdominal segment, in relation to the lateral mesenteries and to the 
sides of the dorsal space, the areolated tissue was present in abundance, and the cells in 
the areolze were distinctly fatty; the pigment of the pigmented lining membrane was 
prolonged into the strands of the meshwork, and caused them to contrast strongly with 
the light-refracting contents of the fat cells which they surrounded (figs. 25, 26, 27). 
In the terminal caudate segment of the abdomen the intestinal division of the 
canal had a similar compressed appearance; the wall of chitin was lied by a 
membrane associated with characteristic pigment cells; lateral mesenteries and 
adipose areolated tissue corresponded with the arrangement described in the 
genito-abdominal segment (fig. 32). 
In the genito-abdominal and terminal segments the dorsal and ventral spaces 
were well marked, and the dorsal was much more capacious than the ventral. The 
membrane which bounded them was lined by a layer of cells, sometimes continuous, 
