291 Canon A. M. Norman and Dr. T. Scott on 



Genus Ameira, Boeck, 1864. 

 Ameira simplex, sp. n. 



Description of the female. — Body moderately slender; 

 rostrum somewhat prominent; length "64 mm. (^ of an 

 inch). 



Antennules short, moderately stout, eight-jointed, first and 

 second joints longer and somewhat more robust than the 

 others, third to the sixth short and subequal ; the last two 

 are also small, as shown by the formula — 



Proportional lengths of the joints. . 15 . 15 . 9 . 8 . 6 . 7 . 3 . 5 

 Numbers of the joints 1 2 3 4 5 6 7 8" 



Antennae small, outer ramus short and uniarticulate and 

 provided with a few terminal setae. Mandibles also small, 

 mandible-palp simple and one-branched. 



Inner branches of first natatory legs elongated and slender; 

 first and third joints nearly equal in length, second about 

 half as long as the first ; the outer reach nearly to the end of 

 the second joint of the inner branches. The other three 

 pairs are also moderately slender, and the outer branches are 

 rather longer than the inner ones. 



Fifth pair small, inner portion of primary joint subcylin- 

 drioal, with the apex obliquely truncated and bearing five 

 setae, the second seta from the outside being much longer than 

 the others. Secondary joint subovate, length nearly twice the 

 width at the proximal end, the outer and inner margins are 

 only slightly rounded and taper gently towards the narrowly 

 rounded apex ; they are each furnished with five setae, four 

 (three elongated and one — the second from the outside — small) 

 are carried on the rounded apex, and a small one on the 

 proximal half of the outer margin. 



The furcal joints are fully half as long as the last abdo- 

 minal segment. 



Hub. Dredged in the estuary of the Exe, near Starcross, 

 June 9th, 1884 ; apparently rare. No males observed. 



This species bears a close resemblance to Ameira exigua, 

 T. Scott, but it differs to some extent in the proportional 

 lengths of the joints of the antennules, in the armature of the 

 mandible-palp, in the outer branches of the first thoracic feet 

 being as long as first and second joints of the inner branches, 

 as well as in the joints of the inner branches being different 

 in their proportional lengths ; the armature of the fifth pair 

 is also different in the two species. 



