264 U.S. NATIONAL MUSEUM BULLETIN 236 



conical process on 4th segment small; only 1 seta that accompanies 

 aesthetasc. 



Basis and 1st endopodal segment of antenna separate. Exopodite 

 1 -segmented, with 3 setae and small spine. 



Mandible as in previous species, but with 2 setae on basipodite, 

 and 4 setae on styliform endopodite. 



Maxillule, maxilla, and maxillipede as figured and described by 

 Giesbrecht (1882, p. 117, as Ameira tau), Sars (1907, p. 218) and 

 Lang (1948, p. 790). 



Leg 1 (fig. 106a) almost as in A. longipes; exopodite 3-segniented, 

 2nd exopodal segment small, 3rd with 5 appendages. 1st endopodal 

 segment slightly longer than exopodite, 3rd endopodal segment 

 twice length of segment 2. 



The details of legs 2 to 4 can be taken from figures 1066-c^ and 

 the setal formula: 



Leg 5 (fig. 106/) with more or less cordate exopodite, fastened to 

 baso-endopodite with fairly broad strip. Exopodite with 5 marginal 

 setae, median 2 setae lengthened. Baso-endopodite half length 

 of exopodite, with 4 setae, one of which is lengthened. 



Remarks. — The description given above agrees with the typical 

 form of this well-distributed and variable species. The geographical 

 distribution is discussed by Lang (1948, p. 792). The following records 

 are from the hterature which has appeared since Lang's paper: 

 the Gulf of St. Lawrence in Canada (NichoUs, 1939); the Helgoland 

 area of Germany (Klie, 1950); Kiel Firth in Germany (Schiitz and 

 Kinne, 1955); oyster beds near Yerseke in the Netherlands (de Vos, 

 1945); the estuary of the Ems River in Germany (Stock and de Vos, 

 I960) ; Roscoff, France, on the English Channel (Bozic, 1955) ; Teneriffe 

 in the Canary Islands (Noodt, 1955a); Whitstable in County Kent 

 on the English Channel coast (Maghraby and Perkins, 1956); from 

 Posidonia pastures near Portofino in Liguria, Italy (Gallingani, 

 1952); Stalin Gulf, Bulgaria, on the Black Sea (Caspers, 1951); 

 Lake Tuzla in Turkey and the Black Sea coast of Rumania (Marcus 

 and Por, 1961); Odessa Gulf on the Black Sea (Bacesco, et al., 1957); 

 and the Sea of Marmara off Turkey (Noodt, 1955). No Pacific 

 records appear to be available; this is the first record from that area. 

 In the Ifaluk collection some specimens occur in a sand sample, 

 taken some 120 feet from the reef margin at Falarik in the Ifaluk 

 Atoll. In the North Atlantic area the species has been found in a 

 variety of substrata and under widely different conditions of temper- 

 ature and salinity. 



