POLYCMTA—BENHAM. 
77 
I cannot trace any other organs. 
The species is manifestly different from S. parvum Elders, in which the papillae 
are fewer, are definitely spaced segmentally in alternating rings of larger and smaller 
sizes. It differs from S. minutum Webster and Benedict, which is densely clothed in 
papillae, but they are of two distinct sizes (larger in the parapodial levels, and two or more 
irregular rows of smaller ones between); (see Southern*). Both these species also have 
definite tentacles. It may be that in specimens of the new species that have not been 
flattened they may also be found. However, the parapods and the chaetae are 
dissimilar. 
Family AKICIIDdE. 
Genus Aricia Savigny. 
’ J 'C/f '//>. jf CjLco/ 1 / 
Aricia margin at a Elders. 
Elders (1897), p. 95, pi. VI, figs. 150-156. 
Willey (1902), p. 275, pi. XLV, fig. 4 (spine). 
Ehlers (1908), p. 116. 
Ehlers (1912), p. 23. 
Nainereis marginata Fauvel (1916), p. 445, pi. VIII, figs. 20-33 (juvenile form). 
V 
This species is characterised by the triserial arrangement of the spines in the 
anterior 13 or 14 neuropods ; by the absence of any fringe or papillae in their neighbour¬ 
hood ; and by the gills commencing on the sixth chaetigerous segment. 
The worms before me lack the black lines in the inter segmental furrows and 
along the margins of the gills, from which the specific name was derived, but it seems 
now to be recognised that these markings were due to adventitious particles. 
Those from the shallower waters of Boat Harbour are white, are coiled, and have a 
length of about 26 mm. Some of these contain eggs, so that they are not juveniles. 
One anterior fragment from 318 fathoms is of stouter build and of a pale brown 
colour, with an iridescent skin. It measures 20 mm., by 3 mm. across the body and 
2 mm. in height. It consists of a head and only 47 segments. 
The uncini have the form figured by Willey, with a spoon-shaped hollow near the 
end, below which are transverse ridges. 
Localities .—- 
Boat Harbour, 2-4 fathoms. 
Commonwealth Bay, Station 2, 318 fathoms. 
Distribution. —South Georgia, Kerguelen, K. Wilhelm-II Land (Ehlers) ; Cape 
Adare (Willey) ; Roy Cove, Falkland Islands (Fauvel). 
* Southern, Proc. Roy. Irish Acad. Sci. 1914, p. 90. 
