236 V.S. NATIONAL IMUSEUM BULLETIN 236 



Color completely faded, transparently whitish. Female carries 

 two sacs, each with 5 large eggs. 



Adult female (]oc. 800), total length 0.42 mm.; greatest diameter 

 0.11 mm.; length of longest fm:cal seta 0.38 mm. This form will not 

 be described in detail, but the differences with the previous form will 

 be mentioned. 



Body slightly more robust, probably as result of strong contraction. 

 This is particularly apparent in the abdomen, where the hyaline distal 

 membrane of the somites stands out quite clearly (fig. 94a). In 

 addition, there are some lateroventral spinules on the distal part of 

 genital, 3rd, and 4th abdominal somites. The setation of the f ureal 

 rami is identical, but the long 2nd and 3rd setae are not swollen 

 basally and are setose (fig. 94c). 



Antennules (fig. 94e) trifle slenderer than in first form, reaching fz 

 length of cephalic somite. Exopodite of antenna (fig. 94/) indis- 

 tinctly segmented, with 4 setae at terminal exopodal segment. 



Leg 1 (fig. 94g) different by greater length of 1st endopodal segment, 

 which is longer than exopodite and 5 times as long as wide. 3rd 

 endopodal segment about twice as long as 2nd, with 2 unequal, genicu- 

 late setae and fine seta. 



Legs 2 to 4 (figs. 94^-j) with following setal formula: 



endopodite exopodite 



leg 2 1.1.121 0.1.023 



legs 1.1.221 0.1.123 



leg 4 1.1.121 0.1.223 



Structure of leg 5 (fig. 94^) almost identical, but decided difference 

 in development of various setae, as best seen in comparison of figures 

 94k and 93e. 



Remarks. — The differences between the two forms recorded above 

 do not seem to justify specific distinction, the more so since some 

 variability in this form has already been recorded by Willey, who, in 

 addition to the typical form, described a variety intermixtus, based 

 on differences in the shape of the setae of leg 5. It seems probable 

 that the study of more material wiH reveal a greater variability in 

 this rare species than hitherto has been suspected. 



Amphiascoides subdebilis has been recorded from Agar's Island and 

 Harrington Sound in the Bermuda Islands (Willey, 1935: 9 0.47- 

 0.69 mm., cf 0.36 mm.) ; Lough Ine of County Cork, Ireland (Roe, 

 1960) ; Teneriffe in the Canary Islands (Noodt, 1955a: 9 0.60 mm., 

 d' 0.48 mm.); Roscoff, France, on the English Channel (Monard, 

 1935a: cf 0.31-0.54 mm.); Banyuls-sur-Mer on the Mediterranean 

 coast of France (Monard, 1928) ; and Sellick Beach and Reef in South 

 Australia (Nicholls, 1941: 9 0.90 mm.). The specimens recorded by 

 Nicholls are very large and show small structural differences with 



