73 
appear to act as a scraping apparatus for removing the skin 
of the host. 
The first maxillipedes consist of two-jointed appendages 
placed mid-way between the apex of the mouth, when it 
is at rest, and the lateral margin. Their chief function 
is apparently to keep the mouth free from obstruction. 
The second mawxillipedes situated near the middle line, 
mid-way between the first maxillipedes and the first pair 
of feet, are composed of two joints. The basal joint is 
considerably swollen and the apical is in the form of a 
powerful claw, which closes upon the basal joint, forming 
a strong grasping apparatus. According to Claus, and 
others, the first and second mavxillipedes are really only 
the exopodite and endopodite of one and the same 
appendage. 
The first three pairs of feet consist of an endopodite 
and an exopodite attached to a two-jointed protopodite. 
In the first pair the endopodite is rudimentary, and is 
represented by a single minute joint bearing a few sete 
at its apex. The exopodite is two-jointed. In the second 
pair both the endopodite and exopodite are three-jointed. 
The third pair has the protopodite well developed, form- 
ing a lamella. The endopodite and exopodite are very 
small, the former being composed of two joints and the 
latter of three joints. Each of the first three pairs of feet 
is attached to a median sternal plate. The exopodite of 
the first, and the endopodite and exopodite of the second 
and third pairs, are provided with a number of plumose 
setee along the internal margins of the joints. The dorsal 
and ventral margins of the protopodites of the second and 
third pairs of feet are furnished with movable setose 
plates. The sterna of the second and third feet are 
clothed with sete on the posterior margins. The fourth 
pair of feet (Plate I., fig. 1) have two-jointed protopodites, 
