PART 5 A MONOGRAPH OF THE EXISTING CRIXOIDS 165 



The radials are just visible as small interradial triangles. The IBr, are very 

 short. The IBr 2 (axillaries) are triangular, about twice as broad as long. 



The 10 arms are 45 mm. long. The first two brachials are wedge-shaped, longer 

 outwardly than inwardly; the first syzygial pair (composed of the third and fourth 

 brachials) is wedge-shaped, slightly longer interiorly than exteriorly; the next three 

 brachials are oblong, and the following become wedge-shaped, at first short, but after 

 the eleventh about as long as broad and after the middle of the arm elongate. 



Syzygies occur between brachials 3 +4, 9 + 10, and 14 + 15, and distally at intervals 

 of 3 muscular articulations. 



PI is 5 mm. long, composed of 15 segments, of which the first is very short, the 

 second is slightly longer than broad, and the remainder are elongated; the ends of the 

 segments are turned outward and produced dorsally and armed with very fine spines. 

 The five following pinnules are similar to PI but considerably shorter with the distal 

 eversion of the segments more marked, the dorsal projection being equal to from half 

 to nearly the whole length of the segment. The remaining pinnules become longer 

 and more slender and the eversion of the distal ends of the segments gradually dies 



away. 



The color in alcohol is brownish, the arms narrowly banded on about every third 

 brachial with darker brown. 



Notes [BY A.M.C.]. The preceding description was drawn up from the type speci- 

 men in the Museum of Comparative Zoology. 



Dr. Torsten Gislen has given details of 18 specimens secured by Dr. Sixten Bock 

 in southern Japan in 1914. These form the first half of the table below. 



The first one has the centrodorsal hemispherical; the cirri are arranged in a 

 single or double row; the fourth and following segments are slightly constricted cen- 

 trally and are half again as long as the distal diameter; the antepenultimate segment 

 is one fifth longer than broad; the penultimate has a very inconspicuous opposing 

 spine; the terminal claw is narrow, curved, and somewhat longer than the preceding 

 segment. 



The radials are concealed. The IBr, are three times as broad as long, almost free 

 laterally. The IBr 2 (axillaries) are triangular, from two to three times as broad as 

 long. 



The arms are about 25 mm. in length. The first brachials are interiorly united and 

 are twice as long exteriorly as interiorly. The second brachials are twice as long ex- 

 teriorly as interiorly and the inner borders are rather widely separated. The first 8 

 brachials are oblong, the articulations then becoming oblique. The arms are rather 

 smooth. 



P, has the first two segments short and the remainder from two to two and a 

 half times as long as broad with the distal ends everted and spinous. P 3 , P4 and P 5 

 have the first 6 segments with strongly spinous distal ends like the proximal segments 

 of P 2 . Pa and the following pinnules bear a large genital gland. The genital pinnules 

 are 4 mm. long with 13 to 15 segments. The expansion of the distal ends of the prox- 

 imal pinnule segments continues at least to PIO, then becomes more indistinct. 



The disk is 3 mm. in diameter, and is without granules. 



The disk is white; the arms are darker; each cirral has a dark spot proxknally. 



