248 Th. Mortensen. 



slightly more lobed than in the preceding stage. One of the speci- 

 mens (PI. IX, Fig. 3) shows the radiais II— III still small and alike^ 

 in another (PI. IX, Fig. 4) they have already become considerably dif- 

 ferentiated. The radial II is still narrow and slender, only somewhat 

 widened at the lower end, where it joins the now distinctly penta- 

 gonal radial I. The axillary has widened and at its outer end the 

 first arm joints have just appeared. (This specimen is then, strictly 

 spoken, in the stage III already). The basalia have increased con- 

 siderably at the upper side, and there is now scarcely a trace of a 

 straight upper edge, the radialia nearly joining so as to separate 

 the basalia from the oralia; these latter have increased considerably 

 along the outward turned edges. The anal plate is distinct as yet. 

 The second sacculus has appeared. 



Stage III. This stage, characterised by the presence of the first 

 arm-joints, is represented by two specimens attached to cirri, one to 

 the 27th, the other to the 28th joint, and by a pair of loose speci- 

 mens. The complete specimens are 13 — 15 mm long, the calyx w^ith 

 the" arms being 1-5—2 mm (PI. X, Fig. 2). The number of stalk joints 

 is 33—35. The longest joints are 06mm long, 01mm broad. The 

 upper 6 — 7 joints are short, but not broader than those below 

 (PI. IX, Fig. 5). The middle ones (PI. XI, Fig. 4) are quite cylindrical, 

 w'ithout distinct traces of the primary ring, only the ends are 

 distinctly widened in the same wa\^ as described and figured by 

 Sars in the Pentacrinoid of H. Sarsii, the widened ends being 

 slightly compressed from the opposite side in the two ends of each 

 joint, the long axis of the joint-surfaces thus being at a right angle 

 in each two successive articulations (Comp. Sars. Op. cit., p. 54, 

 PI. V, Fig. 16). The joints are otherwise not compressed. The 

 joint-surfaces (PI. XII, Fig. 2) are essentially as figured by Sars 

 for the Pentacrinoid of H. Sarsii (Op. cit. PI. VI, Figs. 17-18), but 

 the keel is not so distinctly serrate as figured by Sars (PL XII, 

 Fig. 3). It is, however, very difficul tto observe these details on such 

 small objects. — The lower joints (PI. XI, Fig. 3) gradually become 

 shorter, the lowermost one being only about half as long as wide. 

 The basal disk is rather large and coarsely lobed. 



In the calyx a conspicuous difference from the foregoing stage 

 is noticed (PI. IX, Fig. 5). The radialia have joined completely above 

 the basalia and have a rather long vertical side-edge. The basalia 

 end in an angle above and are thus now pentagonal; probably they 

 have ceased growing along the upper edges. The radialia are 

 somewhat thickened at the upper side, where the arms emerge. 

 Radialia II and III (the axillary) are still long and narrow. The oralia 

 still retain their characteristic shape and are contiguous with the 



