10 



1] 



12 



13 

 14 



15 



The Amphipoda of Bermuda. 



\ Antenna 1 with accessory flagellum Eusiroides 



\ Antenna 1 without accessory flagellum .... Pontogeneia 



Antenna 1 with accessory flagellum of more than 

 2 joints ; pereiopods 1 and 2 without glands ; 

 uropod 3 projecting beyond others, biramous ; 

 telson cleft 11 



Not Avith same combination of characters . 15 



\ Uropod 3 with raini'very unequal Melita 



\ Uropod 3 with rami not very unequal . . 12 



Maxillae 1 and 2 with outer and inner plates very 



setose 13 



Maxillae 1 and 2 with outer and inner plates not 



very setose 14 



I Pleon segments 4—6 with dorsal spinules . . . Gammarus 

 I Pleon segments 4—6 without dorsal spinules . . Ceradocus 



\ Pereiopods 3—5 slender Maera 



I Pereiopods 3—5 robust Elasmopus 



Antenna 1 with no accessor^^ flagellum ; mandible 

 without palp ; pereiopods 1 and 2 without 

 spinning glands ; uropod 3 small, uniramous 16 



Not with tliis combination of characters . 19 



Maxilliped with 3-jointed palp Insula 



Maxilliped with 4-jointed palp 17 



Antenna 1 shorter than peduncle of 2 .... Orchestia 

 Antenna 1 longer than peduncle of 2 . . 18 



Maxilla 1 with palp Hyale 



Maxilla 1 without palp Parhyalella 



Antenna 1 with accessor^' flagellum well developod ; 



maxilla 1 with inner plate small ; pereiopods 1 

 19 I and 2 with spinning glands ; gnathopod 1 



larger than gnathopod 2 20 



Not with this combination of characters . 21 



I Gnathopod 1 in male with fifth joint produced to 

 form a large tooth Micro deutopus 

 Gnathopod 1 in male with fifth joint not so produced Autonoe 

 Antenna 1 with accessory flagellum ; low^er lip 

 with anterior margin of outer plate entire ; 

 21 I pereiopods 1 and 2 with spinning glands ; uro- 

 pod 3 not uncinate 22 



Not with this combination of characters . 24 



22 



Telson emarginate Eurystheus 



Telson entire 23 



