92 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
Bruntz found that certain small cells of the 
epithelium of the hepatopancreas, called ‘ Fermentzellen ’ 
by Weber, pass coloured solutions such as acid fuchsin 
from the body cavity into the lumen of the duct and are 
excretory in nature. 
REPRODUCTIVE ORGANS. 
The reproductive organs of Ligia oceanica are simple 
in structure. In the male (P1.IV., fig. 4) there are three 
pairs of elongate fusiform testes (¢.), each being prolonged 
into a fine filament. They are situated dorsal to the 
intestine in the second and third thoracic segments. The 
three testes of each side are placed in series, and open mto 
a vas deferens (v.d.) of uniform width throughout the 
greater part of its length. The vasa deferentia are usually 
white and extended. They are situated on the dorso- 
lateral sides of the intestine, and extend in a horizontal 
direction to the seventh thoracic segment. In this 
segment they narrow abruptly to form two narrow ducts, 
which curve ventrally round the hepatic tubules; each 
opens at the base of a styliform appendage (st. ap.) 
situated on the ventral side of the seventh thoracic 
segment, on one side the median line. The testes are 
divided by slight constrictions which indicate different 
regions of spermatogenesis in the interior. In the 
process of spermatogenesis the spermatids unite in varying 
numbers to form colonies, their cell walls disappearing. 
The nuclei elongate considerably, and very fine fibres are 
formed which may be attached to the nuclei, but on 
account of their extreme tenuity the writer is unable to 
be certain on this point. Miss Nichols found the same 
difficulty in the spermatogenesis of Oniscus asellus. The 
whole sperm colony, as it may be termed, together with 
the cytoplasmic fibres, is surrounded by a_ protoplasmic 
