120 
Clave)la sciatherica n. sp. 
The 1st Antennae , or antennules, are small and three-jointed. They are so 
short that they do not project beyond the antennae. The basal joint is the 
largest and has a slight turn upon itself. The terminal joint is slightly the 
larger of the other two, and is tipped with two large spines, with a smaller 
spine on the inner border. 
The 2nd Antennae are uniramose, without an exopodite or palp such as is 
present in Lernaeopoda. They are turned inwards towards each other across 
the frontal margin of the head. They often meet and overlap in the middle 
line, but do not appear to be deflected in such a way as to do so in this species. 
They are bluntly rounded at the apex which is covered by a large number of 
denticulations and are tipped with two or sometimes three very small spines. 
Fig. 4. Clavella sciatherica, £. The mandible, and the distal end of the 2nd maxillae, d. disc; 
b. bulla; m. manubrium. 
The Mandibles appear to be very rudimentary, crotchet-like, bearing five 
or six teeth on their outer margin. In Fig. 4 the part blackened in is strongly 
chitinised; and the remainder may possibly become so in the course of time, 
as this is drawn from the immature female. The mandibles are entirely 
dissimilar from the usual type found in this family. 
The ls£ Maxillae are small, and bipartite with an exopodite or palp such 
as is present in Lernaeojjoda. 
The 2nd Maxillae are entirely fused, very short, not in the same straight 
line with the cephalothorax, and expanded at the apex into a flat (not 
cupuliform) disc which touches, but does not penetrate, the tissues of the 
host. From the disc arises a horn-coloured almost spherical bulla completely 
imbedded among the host’s cells. The sphere, which exhibits characteristic 
markings, is joined to the disc by a short manubrium, which, like the bulla, 
but not the disc, is formed of chitin (Fig. 4). During development the 
1st maxillae have migrated considerably posteriorly, so that they come to 
lie at the base of the neck a long distance behind the maxillipedes. 
The Maxillipedes are clawed appendages whose bases diverge from one 
another. Each consists of a basal joint which is so stout as to be reniform, 
well supplied with powerful muscles which move the terminal clawed joint, 
