ANATOMY OF TANIA MEDIOCANELLATA. ly 
upwards and outwards from it towards a lateral edge, but 
not reaching it, are linearly arranged granules similar to the 
uterine globule, the early stage of the vaginal canal; a col- 
lection of granules is also present near a longitudinal water- 
vascular canal at the site of the bulb of future penis. At the 
235th segment the lower end of the uterus is clearly defined, 
and a broad undulating band of granules pass from it in the 
central line to the upper end of the segment; the outline of 
the genital pit is distinguishable, and the cuticle of the edge 
of segment corresponding to the future genital aperture is 
tumid; there is an irregularly undulating granular accumu- 
lation between the longitudinal water-vascular canal and 
the centre of the segment in the line of the site of seminal 
glands. From this point to the 270th segment a rapid advance 
in development takes place; the uterus becomes clearly defined 
as an undulating canal, terminating at each end in a bulbous 
dilatation, and containing within it spherical epithelium-like 
masses ; the vagina, sharply outlined with dark granules in its 
walls, is traceable from the uterus to near the genital pit; above 
the level of the vagina, from the longitudinal water-vascular 
canal inwards, is a line of somewhat spherically amassed 
granules, seminal glands, and in a similar position as regards 
the canal, but rather close to it and arranged from above 
downwards in the segment, are similar masses, ovarian 
glands ; the body of the penis is foreshadowed ; the expansion 
at the junction of the vascular canals is well defined; the 
calcareous nodules are approaching linearly arranged from 
the circumference of the body substance to the visceral boun- 
dary. At the 282nd segment, the genital orifice being 
apparent to the eye, the seminal and ovarian glands are 
clearly defined and recognizable as such, the latter at least 
100 in number on each side of the uterus and containing 
epithelium-like spherical cells can be turned out from the 
excavations in the visceral substance in which they lie; in 
the lower half of the segment the ovarian tubes are 
distinguishable, in the upper half there is still a distinct 
separation between the glands and the uterine channel; 
between the lower uterine bulb and the segmental boundary 
are ovarian glands, and these produce an elevation in site of 
the vaginal communication with the uterus to the junction 
of the lower with the upper two thirds of segment ; from the 
genital pit fibres pass in forming the sheath, and within it 
the cylindrically arranged granules outline the penis. At 
the 300th segment the penis is fully formed, the seminal 
tube connects the testicular bodies, many of the ovarian 
glands have coalesced and all are connected with the uterine 
VOL, XV.—NEW SER. B 
