338 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. PHRONIMIDiE. 



Dairella latissima. 



ute hairs; the secondary lainina is long, and is provided at the apex with two short 

 spines and a few minute hairs. 



The maxillipeds (Pl. XV, fig. 8) have the stem long, and only a little narrower at 

 the apex than at the base. The median lobe is small, only a little projecting, and ob- 

 tusely rounded at the apex. The lateral laminse are narrow at the apex, and sparingly 

 fringed with short hairs. 



The perceon is like that in the preceding species, the first two segments being co- 

 alesced, and the fifth and sixth being the longest. 



The epimerals are coalesced with the segments, and their upper limit marked by a ridge. 



The branchial vesicles are more than half as long as the femora of the correspond- 

 ing pairs of pert^opoda. 



The first pair of jjerceopoda (Pl. XV, tig. 9 and 10) are about as long as the se- 

 cond. The femur is about four times as long as broad, and is considerably longer than 

 the three following joints together, and has the under margin fringed with minute spines. 

 The carpus is more than half as long as the femur, the hind margin is set with minute 

 spines. The metacarpus is more slender than the carpus, being scarcely more than half 

 as broad; it is two-thirds as long as the carpus. The dactylus is feebly curved (Pl. XV, 

 fig. 10), and is a fourth part as long as the metacarpus. 



The second pair are closely similar to the first, and reach to the middle of the meta- 

 carpus in the third pair. The femur is somewhat more dilated than in the first pair, 

 three and a half times as long as broad. The carpus is only a little shorter than 

 the femur. 



The third and fourth pairs (Pl. XV, fig. 11 and 12) are similar in shape and equal 

 in length. The femur is nearly four times as long as broad. The carpus is much 

 shorter than the femur, and is about a third longer than the metacarpus. The dactylus 

 is sometimes reduced in length, thick, rounded at the apex, and provided with a very 

 large glandular opening. 



The ffth pair are the longest of all, much longer than the fourth pair, and some- 

 what longer than the peraeon. The femur is three times as long as broad, and is about 

 as long as the two following joints and half the carpus together. The carpus is a little 

 longer than the femur, and is not twice as long as the metacarpus. The dactylus is 

 about a fourth part as long as the metacarpus. 



The sixth and seventh pairs (Pl. XV, fig. 13) are equal in length, nearly four-fifths 

 as long as the fifth pair, and a little shorter than the third and fourth pairs. The femur 

 is somewhat dilated, and only a little more than three times as long as broad; in the 

 sixth pair it is nearly as long as, in the seventh longer than, the three following joints 

 together. The metacarpus is fuUy two-thirds as long as the carpus. The dactylus is 

 scarcely a third part as long as the metacai'pus. 



The pleon is a little deeper than the person, and is quite as long as the last five 

 pera?onal segments together. The hind corner of the pleonal segments is broadly rounded. 



The j^^^^P^^d^ (Pl- •^^'^» ^S- 14). The peduncle is longer than the rami. The 

 coupling spines are ten or twelve in number, and are placed in a semicircular row; 

 the stem is smooth. The outer ramus of the first pair has nine joints, the inner eight. 



