AMERICAN PARASITIC COPEPODA. 253 
female the globular mass is extruded through the opening in the 
spermatophoral wall referred to above, and inserted into one of the 
openings of the canals through which fertilization is effected( v. o. 
Fig. 5): its peripheral layer then becomes indurated and brown 
in colour, and is then transformed into the brown capsule, while 
its contents are poured out to form the convoluted canal through 
which the remaining contents of the spermatophore pass into the 
body of the female. That the brown capsule acts as a sort of 
receptaculum seminis is also possible: because spermatozoa are to be 
observed in it, even after the detachment of the empty spermatophore. 
DESCRIPTION OF THE PLATES. 
PLATE I. 
Fics. 1-11.—Lerneopoda Edwardsii. Figs. 12-—18.—Ergasilus Centrar- 
chidarum. 
Fic. 1.—Outline of body, female. 
Fic. 2.—Outline of head and antennae from upper surface ; o/, the upper lip ; 
a, antennulae ; a!, antennae. 
Fie. 38.—Ventral surface of head; d, the dorsal; v, the ventral branch of 
the antennae ; 0 and o!, chitinous outgrowths on the latter ; ch, 
chitinous plate in 2nd joint of antenna; mz, maxilla ; mxp*, the 
internal maxillipedes, the second pair according to some mor- 
phologists. 
Fic. 4.—One of the first pair of antennae. 
Fic. 5.—One of the second pair of antennae from the outer side; ¢, the 
terminal joint of the ventral ramus. 
Fic. 6.—Toothed part of mandible. 
Fie. 7.—Maxilla with palp, met. 
Fic. §.—Chitinous bulla from surface. 
Fic. 9.—Inner surface of one half of a bulla in connection with the arm. 
Fia. 10.—An internal maxillipede. 
Fre. 11.—The free border of the lower lip. 
Fic. 12.—Ergasilus Centrarchidarum from ventral surface ; 1—5, the natatory 
limbs. 
Fic. 13.—The Ist pair of antennae from behind. 
Fic. 14.—The 2nd pair; c!c?c3, hinges between the various joints; e¢! ¢? ¢3, 
extensor muscles ; f, flexor ; st, antennary sternum. 
