18 



Carl Bovallius, The Oxycephalids. 



C. HYPERIIDEA CURVICORNIA. 



The first pair of auteuuse are fixed to the inferior 

 side of the head, they are curved (cj), the first joint 

 of the flagelhim is very large, the following few in 

 number and subterminal (^J). The second pair are 

 folded ((^), or wanting (ç). 



C 1. The femur of the sixth pair of perjeopoda is not 

 operculiforui. 

 CC 1. The second pair of perœopoda ai'e transformed. 

 The seventh pair of perœopoda are not 

 transformed; the telsou is free. 

 CC 2. The second pair of perieopoda are not trans- 

 formed. 

 CCC 1. The head is scarcely produced, not 

 forming a rostrum. The maxillœ con- 

 sist of two laminae. 

 CCCC 1 . The seventh pair of perseo- 

 poda are reduced to two 

 or three joints. 

 CCCC 2. The seventh pair of perseo- 

 poda are complete, not 

 transformed. 



CCCCC 1. The telson is 

 free, not co- 

 alesced with the 

 last ural seg- 

 ment. 

 CCCCC 2. The telson is 

 coalesced with 

 the last ural 

 segment. 



11. PhORCORAPHXDjB. 



12. Pkostoid^. 



13. EUTHAMNEID.«. 



14. Lyc^iid^'). 



1) In my preliminary paper nSystematical list of the Amphipoda Hyperiidea.n 1 thought it 

 convenient to place the genus Tryphtena, A. Boeck, in the same family as Lyccea, Dana, and to apply to 

 the family, containing these two genera and the allies of Lycœa, the name Trypluenidœ, which preceded 

 by nine years the family-name Lycaidcc, proposed by Claus in 1879" in his systematical arrangement 

 of the Platyscelids. Further study of these interesting Hyperids has however convinced me that Try- 

 phœna is more closely allied to the genera Phoixoraphis, Stebbinu, and Lycœopsis, Claus, than to 

 Lyccea and the other genera placed there by Claus. It is principally the peculiar transformation of the 

 second pair of perseopoda that makes it desirable to place Tryphama close to the other members of the 

 old family Phorcidcp., beacuse it would be very strange to suppose such a homologous development of 

 the same organ in genera not closely allied. To this characteristic come others which also, but not so 

 thoroughly, point to a closer relation between the three genera, Phorcoraphis, Lycœopsis, and Tryphœna, 

 as for instance the form of the sixth pair of peiseopoda, the form of the urus and its appendages, and 

 in some way the shape of the first pair of antennae. From the point of view of jn'iority the family- 



