A NEW STALKED CRINOID. 



223 



all of them the long axes of the upper and lower articular surfaces 

 run in directions at right angles with each other. The seventh to 

 ninth columnals, counted from the root, are almost soldered into one 

 piece, showing between them very imperfect and scarcely movable 

 articulations (fig. b) ; they measure altogether 9 mm. in length. The 

 thirteenth to fifteenth columnals, likewise counted from the lower stem 

 end, are also partially fused together, the articulations between them 

 being still more imperfect than in the last mentioned section and 

 being but feebly indicated by two constriction lines (fig. e). The three 

 together are 8 mm. long ; the middle one is much shorter than the 

 others, measuring only 1.5 mm. in length. From about the end of 

 the lowest third of the stem upwards, the columnals measure 6 mm. 

 in major and 4 mm. in minor diameter, and 4,5 mm. in vertical 

 length, the long axes of the upper and lower articular surfaces being 

 always so directed as to intersect each other at angles of about 

 — . Finally in the uppermost parts of the stem, the columnals mea- 

 sure 4.5 mm. in major diameter, 3 mm. in the minor, and 2 mm. in 

 vertical length, the long axes of their upper and lower articular sur- 

 faces crossing each other at angles of about --. Thus, the stem as a 



& 6 

 whole is sinistrously twisted in the upper two thirds of its length. The 



third colutnnal from the top is 1.5 mm, the second 1 mm., and the 



topmost or the proximale 0.5 mm. in length. The third and the second 



are nearly, while the second and the proximale are quite firmly 



soldered together. All these three uppermost columnals are shaped 



nearly like circular discs, measuring 4 mm. in diameter. 



The basais are pentagonal, measuring 3 mm. in width and 1.5 mm. 



in height; the lateral sides are 0.5mm. long; the lower side is 2.5 



mm. long and gently curved. The first radiais are likewise pentagonal, 



3 mm. wide, 2 mm. long in the median line, and 2.5 mm. along lateral 



sides ; the external surface is convex, especially so in its upper part, 



so that the upper articular surface is practically semicircular in outline 



The proximale, basais and first radiais are completely soldered toge- 



