PLATE XXXIX. 
Figure 
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Cinachyra barhata, .... 
1. A cloaca or vestibule as seen when cut open by a median longitudinal 
section ; x 3. 
2. A median vertical section, through the oscular tube, and part of the 
eloacal wall ; x 32. 
3. A part of the wall of the cloaca, seen en face; x 73. 
4. The area around one of the pores of the preceding, more highly 
magnified; x 292. 
5. A tangential section through one of the pillars where the cloacal wall 
passes into the oscular tube ; these pillars are seen in the upper part 
of fig. 3, between the pore-bearing areas and the fibrous layer ; 
X 292. 
6. Transverse section through the margin of an oscule of a very young 
sponge, showing a supposed aesthocyte, which is continued at its 
inner extremity into a collencyte, this in turn is continuous with the 
sheath of a myocyte ; the oblique cylindrical brown bodies looking 
like rods seen on the right of the figure, slanting to the right within 
clear spaces, are myocytes cut across obliquely ; the horizontal line 
bounding the figure above is an epithelial surface ; x 576. 
7. A similar section to the foregoing, also from a very young sponge, 
showing several fusiform cells l 5 dng immediately beneath the 
epithelium and at right angles to it ; x 292. 
8. Transverse section through part of the oscular tube of a fully-grown 
sponge ; the epithelial surface is uppermost in the figure, it takes a 
very irregular course, and below it are numerous supposed sesthocytes, 
deeper inwards these are followed by concentrically arranged myo- 
cytes ; X 292. 
9. Myocytes, as seen in a teased preparation ; x 292. 
1 0. Myocytes in continuity with collencytes, as seen in a teased preparation ; 
X 292. 
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