160 
MR. H. N. MOSELEY ON THE ANATOMY AND 
V. D. Contorted vas deferens. 
P. Penis, with seminal canal displayed. 
C. P. Cavity through which the penis is protruded. 
EX. External generative aperture. 
UT. Uterus. 
Fig. 4. Blind extremity of the uterus of Bipalium Diana , and entrance into it of the 
oviducts, as seen in a vertical section transverse to the long axis of the body, 
and slightly anterior in position to the one from which fig. 6 is taken. 
The internal muscular coat here does not preserve its circular disposition. 
The fibres composing it pass inwards with the oviducts, inferiorly mingling 
with some fibres accompanying these ducts. The oviducts pass inwards to 
meet one another in the middle line of the body; they, however, do not 
anastomose, but open into the cavity of the uterus by separate orifices (O), 
which are divided from one another by a slight ridge or projection. The 
blind termination of the uterine cavity (U) is seen here in the contracted state. 
The epithelial lining of the uterus is very thick, and probably glandular in 
function ; it is covered with long cilia. 
R. M. Radiating muscular fibres. 
L. M. Longitudinal muscular fibres seen in section. 
C. M. Circular muscular fibres. 
OD. Oviduct. 
O. Opening of oviduct into uterus. 
U. Blind extremity of uterus. 
E. Epithelium. 
Fig. 5. Vertical section, transverse to the long axis of the body, of the penis and its 
immediate surroundings in its basal region, from Bipalium Diana. Drawn 
with the camera. The base of the penis is here seen in section ; superiorly 
it is seen attached to the body by a mass of muscular fibres, which converge 
towards it and unite with its proper muscular system. This mass of muscular 
fibres is part of that which is seen passing into the penis in fig. 1, Plate 
XIII. : the fibres composing it radiate towards the penis in all directions, 
and are thus exposed in both longitudinal and vertical sections of the body ; 
they become in great part longitudinal muscles of the penis (L.P.), 
which are especially developed on its dorsum, as seen in the section, but 
partly also join the radiating and circular muscular systems of that organ. 
On its inferior aspect the penis, where free in its cavity or sheath, is 
provided with delicate special longitudinal (L. M.) and circular (C. M.) mus- 
cular fibres. The penis, as here seen in section, is seen to consist of from 
without inwards, first, a layer of epithelium (a), which appears as if com- 
posed of small rounded transparent vesicles ; then a thin layer of external 
circular muscular fibres (E.C.), which superiorly are lost amongst the vertical 
