22 Prof. J. C. Schiédte on the Structure of 
responds with the far greater development of the hooked limbs 
in that genus, to which we shall allude further on. 
The mandibular palpi (m, fig. 6a), on the contrary, enter 
into far closer connexion with the mouth-tube in Taithon 
than in ga. Instead of being slender and furnished with a 
brush of bristles and a comb of spines as in Aga, they are 
short, thick, and conic, and they are inserted on the stem in 
such a manner that they become directed straight forward. 
They are accordingly applied to a different purpose, namely 
to the support of the mouth-tube, round which they lie closely, 
meeting in front of it and embracing it between them. In 
Anilocra (fig. 5) this destination of the mandibular palpi is 
still more apparent in their form, the joints of the palpi being 
so accurately fitted to the space between the antenne and 
the labrum that they surround the mouth-tube as a kind of 
padding. . 
Excepting that the sawing-styles formed by the first pair of 
masxille (fig. 6 6) are less powerfully armed than in Aga, the 
difference in the inner machinery is confined to the structure 
of the mandibular lobes (m, fig. 6 6), which are thin, triangular, 
pointed lobules, with a sharp inner edge, and are doubtless used 
not merely for stinging, but also for the purpose of clipping, 
as they are capable of being crossed like the blades of a pair of 
SCISSOrS. 
_ The formula for Cymothoa will consequently be the follow- 
ing :-— 
: Cymothoa. 
Os haustellatum. 
Haustellum adversum clypeo labroque, aversum in foemina 
malis posterioribus, in mare malis posterioribus palpisque 
pedum maxillarium confectum, malas mandibulares punc- 
torias maxillaresque priores rasorias involvens. 
Clypeus fornicatus, pendulus. 
Labrum amplum, semicirculatum, pendulum, fornicatum, mar- 
gine minute verruculoso. 
Mandibule stipite quadrato, fixo, apice palpigero, mala inte- 
riore nulla. Mala exterior sub labrum oblique inflexa, 
mobilis, in orificium haustelli deorsum eminens, triangula, 
compressa, acuminata, cultriformis. Palpus labrum utrin- 
que aimplectens, triarticulatus, conicus, nudus; articulis 
sensim decrescentibus. 
Maxille priores stiliformes, mala interiore et palpo nullis. 
Mala exterior stipiti contigua, in orificium haustelli deor- 
sum eminens, fasciculo armata terminali hamorum raso- 
riorum. 
