crq CfQ 
166 
ME. H. N. MOSELEY ON THE ANATOMY AND 
h. Mass of cells and terminal papilla. 
o. oviduct. 
. 14. Transverse section of oviduct of B. Thwaitesii. 
.15. Longitudinal section in a plane parallel to the ambulacral surface of Bhyncho- 
demus Thwaitesii in the region of the testes. The section passes through the 
main water -vascular space and the testes. These organs stand out in relief, 
being not so deeply stained as the surrounding tissue. The dark tissue on 
the right-hand side of the drawing consists of muscles ; that on the left of 
glandular matter, which is present in great quantity in this situation, imme- 
diately externally to the testes, all through the anterior part of the body. 
The testes (T) are seen as irregularly oval bodies closely packed against one 
another. The water-vascular trunk, in which some very faint longitudinal 
fibres may be traced, gives off transverse branches, which are seen as white 
lines on a dark ground : these are very numerous on the right side amongst 
the muscular tissue ; on the left side beyond the testes, amongst the glan- 
dular tissue, only three are to be seen. 
Fig. 16. Edge of the anterior semilunar extremity of Bipalium Diana , as seen by reflected 
light, magnified. The edge of the anterior extremity or head is seen to be 
traversed vertically by deep indentations or sulci ; these are caused by con- 
traction, due to the action of spirit, but have been described as characteristic 
of certain species. This peculiar mode of contraction is probably, however, 
connected with the power which the animals possess during life of throwing 
out tentacular-like projections from this portion of their body. The edge of 
the head is seen to be marked out into several bands. The superior broad 
band ( a ) is somewhat darkly pigmented ; it is succeeded interiorly by a 
lighter unpigmented band marked by a fine line, h. At d is seen a row of 
semicylindrical papillary projections, between which, at their upper extremities, 
is seen a row of black dots (c), which indicate the apertures of a series of ciliated 
pits ; the row of papillae is succeeded by an unpigmented band. 
f,f. Deep indentations of anterior margin. 
a. Broad pigmented band containing eyes. 
b. Fine line. 
c. Bow of openings of ciliated pits. 
d. Bow of papillary projections. 
e. Unpigmented band. 
Fig. 17. The papillae of Bipalium Diana , shown in the preceding figure at d, as viewed 
from the side, and more highly magnified. 
A. Position of the openings of the ciliated pits, lettered c in the preceding 
figure. Compare Plate XIY. fig. 8. 
