NO. 3 BARNARD : THE PHOXOCEPHALIDAE 179 



1955, Hartman 1956, Hartman and Barnard 1957, and Hartman and 

 Barnard 1958. 



Family PHOXOCEPHALIDAE 



Diagnosis. — Gammaridean Amphipoda with head produced into a 

 hood-like rostrum overhanging the antennae; antenna 1 bearing a well 

 developed accessory flagellum; peraeopod 5 shorter than peraeopod 4 

 and dissimilar to it in structure; peraeopods usually well armed with 

 spines and setae for burrowing into soft bottom sediments. 



Key To PHOXOCEPHALIDAE 



1. Peraeopod 3, article 2 more than twice as wide as article 3 2 



1. Peraeopod 3, article 2 about as wide as article 3 8 



2. Maxilla 1, palp biarticulate 3 



2. Maxilla 1, palp uniarticulate 6 



3. Antenna 2, flagellum multiarticular^, gnathopods 1-2 similar 



in size 4 



3. Antenna 2, flagellum biarticulate, gnathopod 1 much larger 



than gnathopod 2 Joubinella 



4. Palp article 4 of maxilliped bears two large distal setae, 



rostrum minute Microphoxus n.g. 



4. Palp article 4 of maxilliped bears no large distal setae, rostrum 



well developed 5 



5. Mandibular palp borne on a large process, sickle-shaped 



Mandibulophoxus 



5. Mandibular palp not borne on a large process, not 



sickle-shaped Paraphoxus 



6. Mandible, molar bearing ridges and cusps Phoxocephalus 



6. Mandible, molar smooth or bearing a few spines 7 



7. Eyes present, maxillipedal palp article 3 not produced. ...Metaphoxus 



7. Eyes absent, maxillipedal palp article 3 produced Leptophoxus 



8. Eyes absent 9 



8. Eyes present 1 1 



9. Head with dorsal crest, uropod 2 with apical ramal spines 



Pseudharpinia 



