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A Parasitic Copepod 
The Appendages, all paired, are: 1st Antennae (Antennules), 
2nd Antennae, Mandibles, 1st Maxillae, 2nd Maxillae, Maxillipedes. 
The l.si Antenna , or antennule (Fig. 3 a), is four-jointed, and the basal 
joint is much enlarged, somewhat spherical and having a curious spiral 
turn upon itself. Of the other three joints the terminal is the largest, 
and the middle one slightly the smallest. This agrees with Scott’s 
description of L. galei but not with Wilson's, the latter stating that 
the distal three joints diminish regularly in size. The terminal joint 
bears at its extremity five (sometimes six) mammillated spines, one of 
which, on the inner border, is markedly larger than the rest. 
The 2nd Antenna (Fig. 3 b) consists of a basal joint bearing a large 
unjointed endopodite with a round or blunted end, and a small exopodite, 
whose diameter is half (not a quarter) of that of the endopodite, and 
which is distinctly two-jointed, the terminal joint bearing one prominent 
spine, and at least one accessory one (not several small spines). 
The Mandible (Fig. 3 c) is slender and aciculate: the teeth are not 
rounded, and do not resemble Scott’s figure of L. galei. They bear 
a similitude to Kurz’s figure of Achtheres selachiorum which is said to 
be a synonym of L. galei. The teeth are saw-like, the serrations being 
on the inner side of the blade, and pointing posteriorly. The mandibles 
are inside the proboscis, although they originate on the outside of the 
ventral surface of the head (Fig. 5 Mn.) and only become enclosed when 
the edges of the upper and lower lips are fastened together. The base 
of the mandible is outside the proboscis, inserted in a fold of the skin, 
and only the blade or terminal portion enters the mouth tube through 
a triangular opening at the base of the two lips. The blade of the 
mandible reaches to the tip of the proboscis, or may even project a 
little way beyond it. It is widest at the centre, a constriction occurring 
where the blade originates from a triangular proximal basal plate, 
causing it to curve towards the mandible of the opposite side. The 
operation of the mandibles is described by Kurz (1877) and quoted by 
Wilson (1915). 
The ls£ Maxilla (Fig. 3 d) consists of an unsegmented endopodite, 
and a well-developed exopodite or palp which is jointed and tipped with 
three short curved spines (not two as in L. galei). The endopodite is 
tripartite at the distal end, one ramus being terminal aud the other 
two on the inner margin. Each ramus ends in a soft mammillated spine. 
This appendage is the most constant one throughout the various species 
of the genus Lernaeopoda. 
The 2nd Maxillae (Figs. 2 and 4 a) are as long as the trunk, slender, 
