198 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



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 month, when it 

 is at rest, and the lateral margin. Their chief function 

 is apparently to keep the mouth free from obstruction. 



The second maxillipedes 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 maxillipedes 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 setae 

 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 

 seta3 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 setae on the posterior margins. The fourth 

 pair of feet (Plate I., fig. 1) have two-jointed protopodites, 



