104 
course along each side of the median line to the external 
openings. Hach cement gland (Plate V., figs. 4, 5 and 7, 
sg.) 1s a long crystalline organ of nearly the same length 
and breadth as the oviduct, lying ventrally to it. The 
anterior part terminates at the base of the neck, in a blunt 
end. ‘The posterior end communicates with the oviduet 
just inside the opening to the exterior. 
The structure of the ovary of Lernawa differs con- 
siderably from that of Lepeophtheirus. In the eyelops 
stage it consists of a mass of minute nucleated cells. In 
the adult condition there are no tubules, and all the eggs 
are in close contact. The size of the eggs in the ovary 
of the adult varies from ‘04 to ‘08 mm. They are of the 
same structure and undergo the same changes in their 
passage along the oviduct as the eggs of Lepeophtherrus 
when they enter the thoracic ends of the oviducts. ‘The 
ovisaes consist of long slender tubes very much twisted. 
(Plate IV., fig. 1, os.). When straightened out each tube is 
often found to attain the length of seven or eight inches. 
The eggs are arranged in a single column, and the period 
of incubation is of the same duration as in Lepeophtheirus. 
The death of the parent or detachment of the ovisacs has 
nu effect on the vitality of the embryos. 
Fertilisation of the female is effected during the fixed 
period of the cyclops stage. The spermatophores are 
attached to the female in a similar manner to that 
described for Lepeophtheirus. The contents pass into the 
receptacula seminis, and the empty sacs fall away. They 
are then replaced by others in succession, until the recep- 
tacula are filled. Each fully charged receptaculum repre- 
sents the contents of four spermatophores (rep., Plate 
IV., fig. 4). At first there is a distinct division between 
each lot, but this soon disappears, and the whole becomes 
one mass of spermatozoa. From a large number of 
