56 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. VIBILIDjE. 



The labiUm (PL VII, fig. 18) is semicircular, incised at the middle of the hinder 

 convex margin, and beset with very short hairs. 



The mandibles (PL VII, fig. 19 — 22) are well developed; they consist of a thick stout 

 basal portion and a strong molar tubercle with a striated and finely denticulated cir- 

 cular grinding surface (PL VII, fig. 20); at the tip there is, in the right mandible one 

 sharp three-lobated incisive process, in the left there are two. Between these and the molar 

 tubercle there is an accessory three-pointed smaller process, and some long strong simple 

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

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

 prominence; the first joint is short, the second is more than twice longer, curved; the 

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

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



The first pair of maxillm (PL VII, tig. 23) consist of a basal portion ending in a 

 strong process, beset with curved spines 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 with short fine hairs. On the inner side there is to be seen a small accessory 

 lamina, tipped with a few minute hairs. 



The second pair of maxilke (PL VII, fig. 24) are small, consisting of a short 

 basal portion with two 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, fifth, 

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



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

 pair the largest. 



The branchial sacks of the fifth pair are the largest, those of the second the smallest. 



The first pair of pereiopoda (PL ATI, tig. 28) are a little shorter than the second; 

 the broadly ovate femur is about as long as all the following joints together. The carpus 

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

 The metacarpus is stout, almost straight, 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 strongly serrated. 



The second pair (PL VII, fig. 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 serrated. The dactylus is shorter than the carpus, 

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

 tylus is longer than half the metacarpus, the hinder margin serrated. 



The third and fourth pairs (PL VII, fig. 30) are equal in length, robust; the tibia? 

 and metacarpi are longer than the carpi; the metacarpi are finely serrated along the pos- 

 terior margin, three times as long as the dactyli. 



The fifth pair are a little shorter than the sixth; the femur is ovate, the metacarpus 

 is much longer than the carpus, smooth. 



