4 
TH. MORTENSEN, 
(Schwed. Südpolar-Exp. 
is shown in fig. 2, a, b. The second and third brachials are slightly widened, giving 
the outline of these joints a characteristic rounding on the adradial side. All the 
brachials are perfectly smooth and rounded; they are short, broader than long, espe- 
cially so in the distal part of the arm (Fig. 2 a, b). 
Syzygies arranged very irregularly; some instances may show that. In the two 
arms of one pair they occur on brachials 3, 7, 17, 25 and 3, 8, 14, 24; or they may 
occur on brachials 3, 9, 21, or 3, 9, 13, 33 and so on; the second syzygy may be 
Fig. 3. Pinnules of Notocrinus virilis; a. P,, 
b. P 3 . c. a distal pinnule. 8 /t. 
Fig. 4. Side- and coverplates along the ambu- 
lacral furrow of an arm of Notocrinus virilis. The 
dark space along the middle of the figure repre- 
sents the ambulacral furrow. 43 ,/i. 
found so far out as the 13th or 12th brachial. (The syzygial joints are counted as 
one). The hypo- and epizygal joints are very much of the same size. 
The oral pinnules (PI. II, Fig. 1 ; textfigures 3, a — b) are stout and short, Pi ca. 
8 mm., Po and P 3 ca. 9 mm. (in grown specimens); also P 4 may be devoid of ambu- 
lacral furrow and thus belong to the oral pinnules. They are very short-jointed, 
without a terminal comb; only the end joints of P 2 and P 3 are slightly thorny, as seen 
in fig. 3 b. P x has 15 joints (in the preliminary description wrongly stated 11 — 12). 
The outer pinnules are slightly longer than the oral pinnules, ca. 10 mm, and 
hardly diminish in length towards the end of the arm. They are short-jointed, the 
