MARINE GAMMARIDEAN AMPHIPODA 259 



in length; some pereopods dactylate; uropod 3 short, inner ramus 

 scale-like; telson cleft one third of its length; articles Jf-5 of pereopods 

 4-5 one third as broad as article 2 oj pereopod 5 (Haustorius) . Species : 

 1, arctic-subarctic, littoral. 



Protohaustorius Bousfield 



Protohaustorius Bousfield, 1965. 



Type-species: P. deichmannae Bousfield, 1965 (original designa- 

 tion) . 



Antenna 1 semigeniculate; mandibular palp not on basal process, 

 molar triturative; outer plate of maxilla 2 not enlarged; maxillipedal 

 palp 3-articulate, article 3 not geniculate; coxae 1-2 of normal size, 

 not obtusely pointed below; gnathopod 1 simple, article 5 longer than 

 6, gnathopod 2 minutely chelate; pereopods lacking dactyls; uropod 

 3 short, rami subequal; telson short, slightly emarginate; rami of uro- 

 pod 1 not distally expanded; posterodorsal border of pleonite 3 not form- 

 ing lobe overhanging urosome {Pseudohaustorius) ; lower lip lacking 

 mandibular lobes. Species: 2, N.W. Atlantic, littoral. 



Pseudohaustorius Bousfield 



Pseudohaustorius Bousfield, 1965. 



Type-species: P. caroliniensis Bousfield, 1965 (original designa- 

 tion) . 



Antenna 1 not geniculate; mandibular palp not on basal process, 

 molar ridged; outer plate of maxilla 2 not enlarged; maxillipedal 

 palp 3-articulate, article 3 clavate; coxae 1-2 of normal size, 1-3 

 subobtusely pointed below; gnathopod 1 simple, article 5 longer 

 than 6, gnathopod 2 minutely chelate; pereopods lacking dactyls; 

 uropod 3 short, rami subequal; telson short, slightly emarginate; 

 rami of uropod 1 distally expanded; posterodorsal border of pleonite 

 3 forming lobe overhanging urosome (Protohaustorius); lower lip lack- 

 ing mandibular lobes. Species: 3, N.W. Atlantic and Gulf of Mexico, 

 littoral. 



Urohaustorius Sheard 



Urohaustorius Sheard, 1936b. 



Type-species: U. halei Sheard, 1936b (original designation). 



Antenna 1 not geniculate; mandibular palp apparently not on 

 basal process, molar large and projecting but apparently lacking 

 ridges or teeth; outer plates of maxilla 2 not enlarged; maxillipedal 

 palp 4-articulate; coxae 1 and 2 vestigial; gnathopod 1 simple, article 

 5 longer than article 6, gnathopod 2 minutely chelate; pereopods 

 dactylate but some dactyls resembling spines; rami of uropod 3 sub- 

 equal in length; telson short, entire. Species: 2, S. Australia, littoral. 



