!)(') CAIIT. BOVAM.IIIS, AMPHIPODA IIVrKJillDKA. \']HUAl)M. 



Tlio Idbrum (Pl. V'11, Hg. 18) is semicircular, iiirised at tlie iniddlc of the hinder 

 coii\c\ mavgiii, and beset with verv short liairs. 



The mandibleft (]']. VII, fig. 19 — 22) are well developed; they consist of a thick stont 

 basal portion and a sti*ong inolar tubeix-le Avith a striated and finely denticulated eir- 

 onlar grinding snrfaee (Pl. VII, tig. 20); at the tip there is, in the right niandible one 

 sharp three-lobated incisi\e process, in the left tliere are two. Between these and the inolar 

 tubercle there is an accessory thret'-])ointed smaller process, and sonie long strong simple 

 spines. At the side of the incisive process there is a bundh' of long slender hairs. At 

 the onter side of the basal portion arises the three-jointed palp, fixed on a tubercular 

 prominence; the iirst joint is short, the second is raore than twice longei-, curved; the 

 third is the longest, beset with four rows of verj' short spines along the upper side, rounded 

 at the apex (Pl. VII, fig. 22), and carrying short stiff hairs. 



The Ji,rst pair of inaxilln' (Pl. ^^I, tig. 23) consist of a basal portion ending in a 

 strong process, beset with curved sjjines and short hairs; on the outer side at the base 

 of this process arises a long feebly bent lamina articulating -with the basal portion, and 

 bordered Avith short tine hairs. On the inner side there is to be seen a small accessory 

 lamina, tipped with a few minute hairs. 



The second pair of mnxilhv (Pl. VII, tig. 24) are small, coTisisting of a short 

 basal portion with t\vo short rounded processes tipped with short stiff hairs. 



The maxillipeds (Pl. VII, fig. 25 — 27) consist of a comparatively short basal portion, 

 a broad median process, and two lateral lobes, bordered with a row of complicate teeth. 



The pereion; the first segment is shorter than the second; the third, fourth, tifth, 

 and sixth are equal in length, the seventh is considerably shorter. 



The epnmerah of the fourth, fifth, and sixth pairs are very large, those of the tifth 

 pair the lai'gest. 



The hrancJiial säcks of the tifth pair are the largest, those of the second the smallest. 



The Jirst pair of pereiopoda (Pl. A^ll, tig. 28) are a little shorter than the second; 

 the broadly ovate femur is about as long as all the follo^ving joints together. The carpus 

 is broader and longer than the metacarpus, the hinder margin fringed with long bristles. 

 The metacarpus is stout, almost sti'aight, the hinder margin bordered with a comb-like 

 row and equal spines. The dactylus is somewhat longer than half the metacarpus, strong, 

 the hinder concave margin strongiy serrated. 



The second pair (Pl. VII, tig. 29); the tibial process is almost as long as the carpus, 

 fringed with stout bristles; the carpal process is quite as long as half the metacarpus, 

 narrowly spoon-shaped, the margins seri-ated. The dactylus is shorter than the carpus, 

 the hinder margin armed in the same way as the metacarpus in the tirst pair. The dac- 

 tylus is longer than half the metacarpus, the hinder mai-gin serrated. 



The third and fourth pairs (Pl. VII, tig. 30) are equal in length, robust; the tibiaj 

 and metacarpi are longer than the cai'pi; the metacarpi äre finely serrated along the pos- 

 terior margin, three times as long as the dactyli. 



The Jifth jjair are a little shorter than the sixth; the femur is ovate, the metacarpus 

 is much longer than the carpus, smootli. 



