Carl Bovallius, 



Vesiculfs branchiales pedibus pei'eii affixae. 



Pleon tri-articiilatum. 



Unis tri-articiilatum. 



Tehon simplex vel leviter fissura. 



IV. Ampliipoda Hyperiidea. 



Caput cum segmente primo pereii non coalitum. 



Oculi ssepissime grandes, maximam partem capitis occupantes. 



Antennœ superiores flagelle secundario carentes. 



Pedes maxillares in unum coaliti, palpo carentes. 



Vésicules branchiales pedibus pereii affixse. 



Pleon tri-articnlatimi. 



Unis bi- vel raro tri-articulatum. 



Telson simplex non fissum. 



Y. Amphipoda Caprellidea. 



Caput cum segmente primo pereii coalitum. 



Oculi minuti. 



Antennœ superiores flagelle secundario carentes. 



Pedes maxillao'es in unum coaliti, palpum unguiculatum gérantes. 



Vesiciclce branchiales segmentis anticis pereii affixse. 



Pleon et unis valde reducta. " 



Telson nullum. 



AMPHIPODA SYNOPIDEA. 



Amphipods with the head free from the first pereional segment; 

 with large eyes, occupying almost the whole surface of the head; the 

 first pair of antennœ provided with a secondary flagellum; the maxilli- 

 peds more or less coalesced, provided with four-jointed palps; pleon and 

 urus divided into three segments each; telson simple or partially cleft. 



With the true Gammarids the animals belonging to this tribe 

 have many characteristics in com.mon, as the general form of the body, 

 the secondary flagellum of the first pair of antennae, the structure of 

 the maxillipeds and their palps etc. (The first family, Synopidaj, is the 

 most closely related to the Gammarids). Many characteristics point deci- 



