12 
The other appendages are all on the ventral surface. 
The first are the antenne. These consist each of two 
joints, a short stout basal one, and an apical one in the 
form of a strong prehensile claw. The antenne are used 
to assist the second maxillipedes in grasping.* 
The apex 
of the claw projects into a small cup in front of the first 
maxille. 
The mandibles are enclosed in the suctorial mouth 
(Plate IT., fig. 8). They are stvlet shaped, and composed 
of four joints. The apical joint of each mandible is 
flattened, curved inwardly, and serrated on its inner 
margin. There is no mandibular palp. 
The appendages described here as the first maxille are 
given that name with some doubt. The pelagic Copepoda 
have only one pair of maxille, which correspond to the 
second pair in this memoir. The identification of the 
appendages now to be described as maxille is based upon 
the fact that they are innervated by a nerve from the sub- 
esophageal ganglion that has its origin just anterior to 
the nerve supplving the maxille proper. The first maxille 
consist of one joint which is considerably swollen at the 
base, and tapers to a sharp point at the apex, forming as a 
whole, a curved claw. Two minute sete are attached to 
the basal part, and probably represent the exopodite or 
palp. These appendages are situated near the lateral 
margins, and slightly posterior to the base of the antenne. 
The second maxille are placed at the sides of the 
mouth, and consist of a single joint, robust at the base 
and dividing into two slightly curved teeth at the apex, 
representing the exopodite. There is a distinct endo- 
podite, with two sete at its apex, attached to the base of 
the anterior surface of the exopodite. The second maxille 
* Baird (op. cit. p. 263) describes these organs as the first pair of 
footjaws. 
