232 CARL EOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPERIID^. 



Hyperia latissimn. 



loped glands; sometirnes the dactylus is transformed into a spout-like organ, serving as 

 an outlet for the glandular secretion (Pl. XI, fig. 33). In this case it shows a circular 

 opening at the apex, surrounded by bristles. This transformation is perhaps periodical, ^) 

 and connected with the maternal functions, because it is to be found in those females 

 which have nearl}' ripe eggs, but not in females of the same size which are without 

 eggs. Normally the dactylns has the usual form, with a sraall opening at the base. 



The fifth, sixth, and seventh pairs (Pl. XI, tig. 34 and 35). The fem ur is laminar, 

 broader below than at the base, somewhat more than twice as long as it is broad at the 

 apex, and fully as long as the three following joints together. The genu is longer than 

 broad. The tibia is nearly twice as long as the genu, with smooth margins. The 

 carpus is a little shorter than the tibia, and distinctly narrower; the front margin is fringed 

 with minute spines along its lower half. The metacarpus is nearly twice as long- as 

 the carpus; the front margin is tinely serrated. The dactylus is longer than a third 

 part of the metacarpus. 



The pleon is a little shorter than the perajon. The lateral parts of the segments 

 are rounded behind. 



The pleopoda. The outer ramus of the tirst pair has eight joints, the inner seven. 



The urus is a little shorter than the last pleonal segment. The lirst ural segment 

 is somewhat longer, and much broader, than the last coalesced, which is nearly twice as 

 broad as long, and has a deep incision on each side for the articulation of the second 

 pair of uropoda. 



The uropoda (Pl. XI, fig. 36). The first pair i-each to the middle of the outer 

 ramus of the last pair; the peduncle is linear, nearl}' four times as long as broad; the 

 rami are narrowly elongate, and sharp-pointed; the outer is shorter than the inner, which 

 is about as long as the peduncle; the outer ramus is finely serrated along the inner 

 margin, the inner ramus is serrated along the outer margin. The second pair reach beyond 

 the apex of the peduncle of the last pair; the peduncle is narrower than that of the first 

 pair, but reaches as far backwards; the rami as in the preceding pair. The peduncle of 

 the third pair is linear, about three times as long as broad; the rami are equal in length, 

 more than twice as long as the breadth of the peduncle, and serrated as in the first pair. 



The telson is triangulär, rounded at the apex, and a third shorter than the last 

 ural segment; it is much broader than the peduncle of the last pair of uropoda, and much 

 more than half as long. 



■') Compare: C. Bovallius, »The Oxycephalids», p. 42. Nova Aota. Soc. Reg. Sientiarum Upsal. Ser. 

 III. Vol. XV. 



