394 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. PIIRONIMIDiE. 



PkronimeUa elongata. 



The uriis is only a Httle shorter than the last pleonal segment. The first ural seg- 

 ment is somewhat longer than the last coalesced one, which is considerably longer than broad. 



The uropoda (Pl. XVI, fig. 57). The first pair reach to the middle of the outer 

 rtimus in the last pair; the rami are elongate-lanceolate, and finely sen^ated on both 

 margins; the inner ramus is a little shorter than the outer. The second pair are repre- 

 sented only by a minute sack-like prominence on either side of the base of the last ural 

 segment. The peduncle of the third pair is elongated, a little broader below than above, 

 and about six times as long as it is broad at the apex; the inner ramus is half as long 

 as the peduncle, and is a trifle shorter than the outer. 



The tdson is scarcelj' more than a third part as broad as the hind portion of the 

 last ural segiuent. 



The m a 1 e. 



Pl. XVI, %. 58—67. 



The body is thicker and more robust than in the female. 



The first pair of antennoe (Pl. XVI, fig. 58) are considerably longei' than the head 

 and peroäon together. The first joint of the peduncle is thick, almost globular, and is 

 nearly twice as long as the two following together. The first joint of the flagellum is 

 more than twice as long as the whole peduncle, and has the lower front corner produced 

 into a conical process; the under margin of the joint is thickly fringed with olfactory 

 hairs. The second, third, and fourth flagellar joints are short; the following are long, 

 slender, cylindrical, and furnished with minute hairs on the under margin. The flagellar 

 joints are nineteen or twenty in number. 



The second pair of antennce (Pl. XVI, fig. 59) are only a little longer than the 

 first. The first two free joints of the peduncle are equal in length, the third is longer. 

 The first flagellar joint is slender, tapering, and is longer than the last peduncular joint. 

 The flagellar joints are thirteen or fourteen in number. 



The lahrum is very small, the hind, free margin is slightly bilobed. 



The mandibles (Pl. XVI, fig. 60) are in general form similar to those in Phronima 

 Colletti. The corners of the incisive lamina are irregularly serrated, the median portion 

 of the lamina is finely crenulated. The molar tubercle is long but narrow, armed with 

 blunt teeth, sharp-pointed spine-like prominences, and stout bristles. 



The lahium has the median incision more shallow than in Phronima. 



The first pair of maxillce (Pl. XVI, fig. 61) have the principal lamina cup-like, 

 with the margins strongly serrated with spine-like teeth; the secondary lamina is narrowly 

 helmet-shaped with the apical parts of the margins serrated. 



The second pair of maxillce (Pl. XVI, fig. 62) have the principal lamina conical 

 and sparingly set with long hairs; the secondary lamina is feebly curved, tAvo-pointed at 

 the apex, and furnished with a few long hairs. 



The maxillipeds (Pl. XVI, fig. 63) are comparatively small. The lateral laminte 

 are narrow, feebly curved, with the outer margin convex, and the inner margin feebly 



