218 ALICE L. EMBLETON ON A NEW 
smaller part ending in three teeth on its inner surface; the fifth 
is the same, being however longer and stouter (Pl. 22. figs. 6, 7). 
In none of the descriptions of allied forms can I find an 
account of such an apparatus as this on the second antenna, 
though the number of parts going to make up the limb agrees 
with that in other genera, but this hooking arrangement is 
peculiar to Gotdelia japonica. Doubtless these hooks serve to 
fix the parasite to the walls of the rectum of its host. 
Mouth-parts.—These consist of an upper lip, mandibles, and 
maxille, all grouped on a raised dome-shaped area, occupying a 
relatively small space, owing to the reduction and degeneration 
of the various parts (Pl. 21. figs. 2, 3, mv.). 
Upper Lip—Overhanging the mouth-opening is a flattened 
lip; its lower edge is not pointed into a “ beak”’ as Kossmann 
says of Clausidium:—“ die Oberlippe léuft nach hinten za in 
linen spitzen Schnabel aus, und erinnert insofern an die Riissel- 
bildung der verwandten Copepoden.” Claus, however, speaking 
of the same creature says:—‘ Der breite Oberlippe bleibt von 
der zweilappigen mit feinen spitzen itiberkleideten Unterlippe 
vollkommen getrennt, kann die letztere aber beim Weibchen 
bedecken. Hine dem Riissel von Parasiten vergleichbare 
Schnabelbildung vernussen wir durchaus.” In Claus’ fig. 3, the 
lip appears very similar to that in my specimens. The double- 
lobed lower lip he mentions is present, fringed with fine sete. 
The upper lip forms a sort of flap, alike in female and male, its 
lower edge being slightly curved (Pl. 22. fig. 10, /.w), with a line 
of fine setz just above the free edge. In the male this lip bears 
stronger and more numerous sete, being particularly well- 
developed at the side angles of the lip. Beneath it, and just 
above the lower lip, is the small, almost circular, mouth-opening. 
The upper lip almost completely covers the mandibles, which are 
very small and simple. ‘ 
Mandibles.—These are a pair of very small chitinous structures 
of simple organization. Hach mandible is a slightly curved 
claw-like organ, ending in a serrated hook (Pl. 22. figs. 8, 9, 
10, md.), the lower edge of which is toothed; this claw articulates 
on to the main stem of the mandible. The mandible of each 
side approaches the other in the middle line, not sloping to each 
other in an accurately transverse direction, but both pointing a 
little posteriorly. There are no “ accessory pieces” or palps on 
this simple organ, though Canu, in all the three known genera, 
