256 U.S. NATIONAL MUSEUM BULLETIN 23 6. 



of nearly same length; 2nd without internal seta, 3rd with total of 5 

 appendages. 1st endopodal segment styliform, longer than exopodite. 

 2nd segment small, 3rd long, 5 times as long as wide, twice as long as 

 2nd segment, with two geniculate setae and 1 fine seta. 



Legs 2 to 4 with 3-segmented exopodites and endopodites (figs. 

 102b-d) and the following setal formula: 



endopodite exopodite 



leg 2 1.1.121 0.1.223 



leg 3 1.1.221 0.1.223 



leg 4 1.1.221 0.1.223 



Endopodites of legs 2 to 4 normally developed, reaching insertion 

 of proximal internal seta on 3rd exopodal segment. 



Exopodite of leg 5 (fig. 102e) small, with total of 5 setae, one of 

 which stronger than rest. Baso-endopodite short, )^ length of ex- 

 opodite, with 2 setae, median seta strong. A more median internal 

 seta has probably been present and was removed by dissection. 

 Genital plates (leg 6) armed with 3 strong setae (fig. 102/). 



Remarks. — I have little doubt that the female described above is 

 Ameira longipes though few Pacific records are available. A. scotti 

 G. O. Sars, 1911, is allied closely to the present species; the male of 

 A. scotti, which is still undescribed, probably will resemble the male 

 of A. longipes in many details. The females of both species are 

 differentiated mainly by the length of the endopodites, particularly 

 that of leg 3, and small details of length of setae of leg 5. The length 

 of the endopodites in the present male specimen is as in A. longipes; 

 the fau'ly long antennules suggest A, scotti. The length of the endop- 

 odites, the structiu-e of leg 5, and the presence of an additional 

 female induced me to record the specimen as Ameira longipes Boeck. 



The geographical distribution of this species has been discussed by 

 Lang (1948, p. 788). To the given localities can be added: the 

 Helgoland area of Germany (Klie, 1950); the Dalkey area of County 

 Dublin, Ireland (Roe, 1958) ; the Plymouth area of England (Marine 

 Biological Association, 1931, 1957) ; and two Pacific records, the Puget 

 Sound beaches (Wieser, 1959) and La JoUa, California (Monk, 1941), 

 in the United States. The species has its main area of distribution in 

 the northern and temperate Atlantic Ocean; it has been found also 

 in the Mediterranean and, sparingly, in the eastern Pacific. In the 

 Ifaluk collection, specimens occur in two sand samples taken at various 

 distances from the reef margin and in samples from crevices near the 

 seaward reef margin. The Ifaluk specimens are much smaller than 

 the Atlantic specimens (9 0.75 mm.) ; the females recorded by Monk 

 (1941) measured 0.77 mm. 



