CLARK] CRINOIDS FROM THE NORTH PACIFIC OCEAN 339 



very short and discoidal, those immediately below 'the basals being 

 slightly wider than the somewhat thicker ones on which they rest; 

 the columnars increase in length rapidly at first, then more grad- 

 ually, reaching a maximum of somewhat over 3 mm. in length about 

 the middle of the stem, after which the length gradually decreases 

 again until near the bottom, the last ten or twelve columnars being 

 long and very stout, with greatly expanded ends, ending in a rather 

 large branching root. 



The largest specimen measures 60 mm. from the basals to the 

 tips of the arms, the stem being 225 mm. long; the smallest crown 

 is about 30 mm. long. The color in spirits is delicate brownish or 

 dull yellowish white, the disk dark brown. 



Type. — -Catalogue No. 22,662, U. S. N. M., from the locality 

 given. 



This species comes nearest to B. carpenterii (Danielssen and 

 Koren) of the northeast Atlantic; but the stem is composed of very 

 much longer and more slender segments, while the lower brachials, 

 which in B. carpenterii are longer than wide, are wider than long, 

 frequently very much so. The arms and pinnules appear to be 

 more slender and delicate than those of B. carpenterii, and, lastly, 

 it is about double the size of that species. 



ZYGOMETRA KCEHLERI, sp. nov. 



Centro-dorsal a flat disk with about twenty marginal cirri ; these 

 are short and rather stout with ten to fifteen segments, the first two 

 short, the others longer than wide, somewhat constricted centrally; 

 terminal claw short and curved; opposing spine very small. 



Radials just visible, free distally; first costals nearly three times 

 as wide as long, united to the low triangular axillaries by syzygy, 

 both rounded and widely free laterally ; ten arms 45 mm. long with 

 sixty-five to eighty brachials, the first seven oblong or slightly 

 wedge-shaped, wider than long, then quadrate and as long as or 

 longer than wide, becoming elongate distally; syzygia in the third, 

 eighth, and twelfth brachials, and distally at intervals of 3 or 4. 



First pinnule long and slender with more than twenty segments, 

 the basal three or four wider than long, the remainder elongate; 

 pinnule on the third brachial distinctly (often much) shorter with 

 fewer segments ; second pinnule the longest with about twenty-five 

 elongated segments ; following pinnules not much shorter, but very 

 much more slender. The anal tube and area about it is heavily 

 plated, but the rest of the disk is almost naked. 



Color in life, bright yellow. 



