16 AUSTRALASIAN ANTARCTIC EXPEDITION. 
P, is 22 mm. long with 36 segments. Viewed laterally it increases in width 
to the fifth and sixth segments, tapers on the seventh-ninth, and is slender with 
increasingly elongate segments from that point onward. The fourth-sixth segments 
have a slight flange-like production of the ventral edges. The following pinnules are 
similar, about 20 mm. long, with the third-seventh segments somewhat expanded and 
‘with their ventrolateral edges produced into a thin narrow flange. The genital pinnules 
have much the same appearance as those of the species of Perissometra. The ventral 
surface of the pinnules is completely enclosed by large covering plates imbricating 
distally, each of which bears a more or less elongate finger-like process extending over the 
median line, the finger-like processes of the plates on the two sides of the median line 
exactly dovetailing over the median line. 
In the largest specimens (Station 12) the arms are about 160 mm. long, or somewhat 
less than twice as long as the longest cirri. 
There is very considerable variation in the height of the middorsal carinate 
processes on the brachials, particularly on the more or less oblong brachials before the 
third syzygy. In occasional specimens (Station 1) the processes on these proximal 
brachials are almost wholly obsolete, being represented only by low obscure and broadly 
rounded tubercles, while in others (Station 1) they are very high with the crest forked, 
Family Norocrrniar Mortensen. 
Genus Notocrinus Mortensen. 
Norocrinus viritis Mortensen. 
Localities.—Station 1, 354 fathoms, December 22, 1913 (three); Station 3, 
157 fathoms, December 31, 1913 ( four). 
Distribution.—Previously recorded only from the Swedish South Polar 
Expedition, 1901-1903, Station 5, in Lat. 64° 20’ 8., Long. 56° 37’ W., at a depth of 
82 fathoms (150 metres); and from ‘‘ Terra Nova ”’ Station 341, off Cape Bird Peninsula, 
McMurdo Sound, at a depth of 44 fathoms (80 metres). 
It is probably to be found everywhere along the shores of the Antarctic continent, 
though more locally distributed than the other Antarctic species of large size. The 
bathymetric range is from 44 to 354 fathoms. 
Colour in Iaife.—Crimson. 
Remarks.—This species is much less fragile than the other comatulids found in 
the Antarctic regions. 
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