218 U.S. NATIONAL MUSEUM BULLETIN 236 



The particulars of legs 2 to 4 appear from figures 84b,c,e,f&nd the 

 setal formula : 



endopodite exopodite 



leg 2 1.222 (modified) 1.1.223 



leg 3 1.2.321 1.1.323 



leg 4 1.1.221 1.1.323 



Endopodite of leg 2 modified; the structure appears best from 

 figures 846, c. External margin has 2 articulating spines, apex a strongly 

 spinulose seta and a normal seta, internal margin 2 setae of unequal 

 length. 



Baso-endopodite of leg 5 (fig. 83/) reaching Ji length of exopodite, 

 with 2 strong spines, 2 rows of spinules and spinulose internal and 

 external borders. Exopodite slightly longer than wide, with total of 

 6 setae, 2 of which are fine. The development and distribution of 

 setae appear in figure 83/. In addition, there are some transverse rows 

 of spinules near the external margin; the internal margin is spinulose. 



Remarks. — 'In the structure of leg 2 this male approaches Metam- 

 phiascopsis hirsutus hirsutus (Thompson and A. Scott, 1903) and not 

 M. h. bermudae (Willey, 1930), but it should be borne in mind that 

 the differences between both subspecies are very slight. Metamphia- 

 scopsis is differentiated from Amphiascopsis by the structure of the 

 mandibular exopodite and by differences in the structure of leg 2 in 

 the male. In the male specimen described here, the mandibular 

 exopodite is set off distinctly from the basipodite, but in the female, 

 at least, it should be greatly reduced and fused with the basipodite. 

 There can be no doubt, however, of the identity of the specimens 

 described above ; a closer study of the characters separating the genera 

 Amphiascopsis Gurney, 1927, and Metamphiascopsis Lang, 1944, 

 seems to be indicated. 



The geographical distribution of M. hirsutus has been discussed by 

 Lang (1948, p. 685). The species has been recorded from several 

 Mediterranean localities. It has been found also in the Indo-Pacific 

 area, where its distribution includes: Addu Atoll and other localities 

 in the Maldive Archipelago (Wolfenden, 1905, recording the species 

 as Dactylopus maldivensis; SeweU, 1940); Henry Lawrence Island in 

 the Andaman Islands (SeweU, 1940); the Madras coast (Krishna- 

 swamy, 1953a); Island Jedan in the Aru Islands (A. Scott, 1909); 

 Rottnest Island and Port Denison in Western Australia (Nicholls, 

 1942a, 1945). The species has been obtained from both weed washings 

 and washings of invertebrates; moreover, it occurs in plankton sam- 

 ples, particularly in those obtained during the night, and in sand 



