358 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 18 



Diagnosis. — Article 2 of peraeopod 3 broad; eyes present; mandib- 

 ular molar bears ridges and cusps; antenna 2 with flagellum poorly de- 

 veloped ; gnathopods 1 and 2 are eusirid in structure, gnathopod 1 larger 

 than 2; maxillipedal palp article 4 long, bearing a distal spine. Pelagic. 



Type species. — Joubinella ciliata Chevreux 1908. 



Remarks. — Of the four species, two are Atlantic and two are north- 

 ern Pacific. The members of each pair are difficult to separate specifi- 

 cally and may not be distinct. The two Pacific species differ from the 

 two Atlantic species in the lack of a large peduncular spine on uropod 

 1. Other minor differences of a quantitative nature are found in the 

 gnathopods and uropods. 



Joubinella ciliata Chevreux 



Joubinella ciliata Chevreux 1908: 8-11, figs. 5, 6. 



Distribution. — Vicinity of the Azores Islands and Canary Islands, 

 depth 1340 to 1530 meters. 



Joubinella traditor Pirlot 



Joubinella traditor Pirlot 1932: 74-81, figs. 19-21. 

 Distribution. — Banda Sea, 310 meters. 



Joubinella bychovskii Gurjanova 



Joubinella bychovskii Gurjanova 1952: 173-177, figs. 1-3. 

 Distribution. — Iturup, Kurile Islands, 20 meters. 



Joubinella strelkovi Gurjanova 



Joubinella strelkovi Gurjanova 1952: 177-180, figs. 4-6. 

 Distribution. — Bering Sea, 660 meters. 



Genus Mandibulophoxus J. L. Barnard 



Mandibulophoxus J. L. Barnard 1957: 432. 



Diagnosis. — Article 2 of peraeopod 3 broad; mandibular palp at- 

 tached to a bulky process of the mandible, the articles of the palp ar- 

 ranged so that it appears sickle-shaped ; maxilla 1 with biarticulate palp ; 



