A MONOGRAPH OF THE EXISTING CRINOIDS 567 



Of the specimens from Ito, No. 9305 is a medium-sized example with 31 arms 

 about 100 mm. long. The division series are well separated and are strongly rounded 

 dorsally. The cirri are composed of 32-33 segments, and are 35 mm. in length. No. 

 9303 has 38 arms. No. 9302 is small and delicate, with 23 arms. 



The specimen from between Ito and Hatsushima (4209) is small. 



Of the 6 specimens from Fukuura in about 150 meters, No. 4113 is a typical 

 example of the species, but greatly exceeds in size any other I have seen. 



The centrodorsal is very large, thick discoidal, 12 mm. in basal diameter, and 

 about 3 mm. in height. The dorsal pole is very broad, flat, with a small deep median 

 pit. The cirrus sockets are arranged in 2 and a partial third closely crowded and 

 irregular marginal rows. 



The cirri are very large and long. They are from 40 to 50 mm. in length and 

 are composed of 32-36 segments, of which the longest are about as long as broad 

 and have a slightly concave ventral profile. The twelfth or thirteenth (usually the 

 former) is a transition segment, beyond which the segments are about twice as broad 

 as long and are highly polished. The segments distal to the transition segment have 

 everted distal edges dorsally, this eversion being V-shaped in end view. The eversion 

 gradually moves to a median position, and on the outer segments becomes a narrow, 

 sharp, and high evenly rounded median keel. The opposing spine is transversely 

 elongated or forked. 



The 40 arms are about 180 mm. in length. All 10 IIBr series and all 20 IIIBr 

 series are present, and all are 4 (3 + 4). The division series and arms resemble those 

 of C. bennetti. 



The proximal pinnules are very stout basally and very long, resembling those of 

 C. bennetti. 



The other 5 specimens are included in No. 4122. Of these, 2 are of medium size, 

 1 having 37 and the other 33 arms. Both are nearly white in color with the sides of 

 the division series and arms brown. 



A medium-sized specimen with 24 arms has the centrodorsal 8 mm. across the 

 pentagonal base and 4 mm. across the irregular dorsal pole, the sides being strongly 

 sloping. The color as preserved is white, with small isolated brown triangular spots 

 along the sides of the division series and arms. 



The 2 specimens from Fukuura without indication of depth are typical. One 

 has exactly 40 arms. 



The example from near lagoshima is medium sized and typical, with the arms 

 about 100 mm. long. It is just undergoing adolescent autotomy. 



As described by Gislen, one of the specimens from Mortensen's station 1 has the 

 cirri XXXVI, 16-21, from 8 to 15 mm. long. The fourth-seventh segments are the 

 longest, from half again to twice as long as broad. 



The 19 amis are 85 mm. in length. The radials are six times as broad as long. 

 The IBr! are three or four times as broad as long, and are free laterally. The IBr 2 

 (axillaries) are twice as broad as long, and have the distal angle produced. The 

 IIBr series are 4 (3 + 4). The IIB^ are 1.8 mm. in width. The division series are 

 smooth and are close together, so that only narrow strips of the dorsal perisome and 

 the pinnule bases can be seen between them. 



