HISTOLOGY OF THE L AND -PL AN ARI AN S OF CEYLON. 
161 
fibres entering the organ; then longitudinal fibres only just visible inte- 
riorly as small black dots (Ep.), but largely developed on the dorsum of the 
penis (L. P.) ; then a series of stout radiating fibres (R. M.), with what resem- 
bles water-vascular spaces (S) in their interstices, and which are sections of 
muscles similar to those (W) seen to pass into the penis superiorly between the 
masses of longitudinal muscles (L. P.). Succeeding these radiating fibres we 
find a stout and compact ring of internal circular muscular fibres (I. C.), suc- 
ceeded by the prostatic glandular tissue (Pr.). Compare figs. 1 & 2, Plate XIII. 
C. Sheath of penis. 
E. Epithelium of cavity of sheath of penis. 
C. M. Its circular muscular coat. 
L. M. Its longitudinal muscles. 
R. f. Radiating fibres attaching it to the surrounding tissue, i. e. here the 
septum between the two intestinal canals. 
a. Epithelium of penis. 
E. C. External circular muscular coat of that organ. 
L. P. Longitudinal muscles of same in section. 
R. M. Its radiating muscles. 
S. Retractor muscles in section. 
W. Retractor muscles in longitudinal section. 
I. C. Internal circular muscular coat. 
Pr. Prostate gland. 
Fig. 6. Transverse section of the uterus of Bipolmm Diana. The external longitudinal 
muscular coat is omitted. Externally is seen the circular muscular coat (C. M.), 
formed of densely interlaced fibres ; then internally to this the stroma (S), 
composed of small spindle-cells and fibres, succeeded by the ciliated epithelium 
(E). The line of demarcation between the epithelium and the stroma is, 
however, often not well marked. The cavity of the uterus in its contracted 
state is cruciform in transverse section. 
C. M. Circular muscles. 
S. Stroma. 
E. Epithelium. 
Fig. 7. Portion of the longitudinal muscles of the vagina from the same preparation, 
highly magnified, to show how the accessory gland-tissue breaks up into fine 
twigs which ramify amongst the muscular fibres. 
A. Accessory gland-tissue. 
L. M. Longitudinal muscular fibres of the vagina. 
Fig. 8. Section of the pharynx of Rhynchodemus Thwaitesii, taken in a direction 
transverse to its longer axis. Drawn with the camera lucida. 
In the centre is the tubular cavity of the pharynx, clothed with a layer of 
epithelium, which appears as a narrow light zone. Immediately externally 
MDCCCLXXIV. T 
