TH. MORTENSEN, 



(Schwed. Siidpolar-Exp. 



is shown in fig. 2, a, b. The second and third brachials are shghtly widened, giving 

 the outUne 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 A'otocrinus viriUs; a. P,. 

 b. P3. c. a distal pinnule. V'. 



Fig. 4. Side- and coverplates along the ambu- 

 lacral furrow of an arm of A'otocrinus virilis. The 

 dark space along the middle of the figure repre- 

 sents the ambulacral furrow, ^^/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. i; textfigures 3, a — b) are stout and short. Pi ca. 

 8 mm., Po and P3 ca. 9 mm. (in grown specimens); also P4 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 F2 and P3 are slightly thorny, as seen 

 in fig. 3 b. Pi has 15 joints (in the preliminar\- 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 



