new Crustacea from Devon and Cornwall. 291 



Genus Ameiua, Bocck, 1864. 

 Amei7-a simplex^ sp. n. 



Description of the female. — Body moderately slender; 

 rostrum somewhat prominent; length 'Gl mm. (:J^^, of an 

 inch). 



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

 second joints longer and somewhat more robust than the 

 other?, third to the sixtli short and subequal ; the last two 

 are also small, as shown by the formula — 



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

 Numbers of the joints T 2 3 4 5 (3 7 ^B" 



Antennae small, outer ramus short and uniarticulate and 

 provided with a itvf terminal set^e. 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 lengtii, 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 

 ])airs are also moderately slender, and the outer branches are 

 rather longer than the inner ones. 



Fifth pair small, inner portion of primary joint subcylin- 

 drical, with the apex obliquely truncated and bearing five 

 Sfta?, the second seta Irom the outside being much longer tlian 

 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 aptx ; they are each furnished with five set?e, four 

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

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

 prcximal half of the outer margin. 



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

 minal segment. 



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

 June 9th, 1^84; apparently rare. No males observed. 



This species bears a close resemblance to Ameira exigii'i^ 

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

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

 niandiLlc-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. 



