6 
the surface of the fisli it narrows more or less abruptly into a 
siender stalk, sunk. through a kind of vault of the skin deeper into 
the tissues of the host; in length it varies from 3 to 7 mm., with 
a largest diameter of from 1,5 to 2 mm. The position of the 
genital openings, carrying the egg-strings, shows that the ventral 
side of the parasite looks towards the surface of the fish. The 
egg-strings seem rather variable in length: in one specimen, the 
external part of which measured 4 mm. in length, 1,5 mm. in 
breadth, they were only 7 mm., although quite complete; in another 
specimen, where the external part measures 7 mm. in length, the 
egg-strings — though deprived of their outer ends — are 22 mm. 
They are cylindrical, the eggs flat, arranged in a single row like 
coins in a rouleau, — as in other Lernæidæ . The eggs are light 
yellow or greenish-yellowish. The external part of the parasite is 
generally somewhat cliocolate-coloured from brown pigment, arranged 
in smaller or larger specks and longitudinal stripes. Young in- 
dividuals, still without eggs, appear uupigmented, whitish. Through 
the cuticle part of the intestine, the ovaries, oviducts and cementing 
giands may be seen. The part hidden in the tissues of the host is 
yellowish with numerous drops of oil shining through. The length 
and shape of this internal part varies a. good deal. One specimen, 
projecting near the middle line of the back in front of the dorsal 
fin of a fish of 42 mm. length, reached through the muscles, past 
the vertebral column, between two ribs to the small intestine; its 
total length is ca. 13 mm., 7 hidden in the fish, 6 external; the 
part passing the muscles form a siender stalk of ca. 5 mm. length. 
Of another specimen, ca. 9 mm. in total length, and attached 
between the right ventral fin and the posterior pectoral light-spot 
of a Scop. glac. 33 mm. in length, about half the length appeared 
externally, but the siender stalk which had only a thin laver of 
muscles to penetrate, has only a length of 0,6 mm. Just inside 
^he body wall the parasite broadens evenly towards the anterior 
end; following the curvature of the posterior appendix pylorica it 
reached under the air-bladder and right lobe of the liver to the 
