W. Nicoll 
333 
South coast, however, I have obtained the species in considerable 
numbers from various Labridae. It is not difficult to distinguish 
from Lebouria varia in the living state, but when preserved the 
differences are less marked and can be made out only by careful 
examination. At first sight the obvious difference in the disposition 
of the yolk-glands is striking, but bejond that there is little to go 
upon. On close inspection, however, one or two other differences will 
appear. 
This species has much the same shape and appearance as L. varia 
but is distinctly lighter in colour, a fact which may be attributed to 
the less density of the volk-glands and to the more delicate texture of 
the body in general. It is also much smaller than that species, being as 
a rule only about |rds its size. The specimens from the South coast were 
all mature and measured 0'8—T45 mm. in length. Looss’s specimens 
therefore were of maximum size (T5 mm.). The average of my specimens 
is almost exactly 1 mm. The greatest breadth at the level of the 
ventral sucker is 0‘46 mm. or rather less than half the length. The 
oral sucker has a diameter of 0T55 mm. and is thus between -fth and 
^-th of the body length. The ventral sucker is transversely oval and 
measures 0'22 x 0'26 mm. Its greater diameter is therefore a little 
more than |th of the body length. The ratio of the transverse 
diameter of the suckers is approximately 3:5. The ventral sucker is 
situated at a distance of 0'46 mm. from the anterior end and it is 
thus considerably nearer the centre of the body than is the case in 
L. varia. 
There is a short prepharynx followed by a large pharynx measuring 
0’077 x 0’066 mm. It is therefore absolutely smaller than that of 
L. varia, but proportionally it is actually of much the same size. The 
oesophagus as a rule is slightly longer than the pharynx, 0’09 mm. in 
length. The excretory vesicle has the same extent as in L. varia. 
The genital aperture has also the same situation although it is 
perhaps a trifle further forward. The cirrus-pouch appears shorter 
owing to the backward displacement of the ventral sucker. Its posterior 
end only extends a short distance beyond the anterior border of the sucker. 
The disposition of the genital glands is almost precisely the same as in 
L. varia. The testes however are a little fui'ther back so that the post- 
testicular space comprises only ^th of the body length. The testes in ad¬ 
dition are relatively smaller being only 0T2 mm. in diameter so that again 
the post-testicular space is equal to about one and a half times the 
diameter of a testis. The diameter of the ovary is about 0 085 mm. 
