A MONOGRAPH OF THE EXISTING CRINOIDS 453 



long, with the anterior edges usually somewhat concave and bordered with short 

 fine spines, and the lateral edges parallel to those of the adjoining IBr 2 and therefore 

 making a broadly obtuse angle with those of the IBr,. These lateral edges are about 

 two-thirds as long as the lateral edges of the IBr,. The IIBr series are 4 (3 + 4), 

 widely separated. The IIBr, are interiorly united for slightly more than their proxi- 

 mal half, diverging at a broadly obtuse angle distally. The distal edges of the IIBr a 

 and IIBr 4 are bordered with fine short spines. The IIIBr series are 2, two to each 

 post-radial series, developed interiorly. Their two component elements resemble 

 the IIBra and IIBr 4 . 



The 30 arms are about 60 mm. long. The first 2 brachials are subequal, slightly 

 wedge-shaped, from two to four times as broad as the exterior length, the first united 

 interiorly for slightly more than the proximal half, diverging at a very obtuse angle 

 distally. The next 3 brachials are almost oblong, about twice as broad as long, 

 with the sides somewhat concave and the proximal and distal edges prominent and 

 bordered with fine spines. The following brachials are very obliquely wedge-shaped 

 or almost triangular, about as long as broad, with prominent and finely spiuous 

 distal ends and the sides and dorsal surface more or less concave, becoming gradually 

 less obliquely wedge-shaped distally. 



The mouth is central or subcentral, the anal tube lateral. The disk bears small 

 scattered calcareous concretions which become more numerous on the anal area. 



Notes. One of Mr. Alan Owston's specimens from Sagami Bay (7036) has 

 exactly 30 arms. The IIBr series are 4 (3 + 4) and the IIIBr series, which are only 

 developed on the inner side of each postradial series, in other words in 1, 2, 2, 1 

 order, are 2 (1 + 2). 



Owston's other specimen (7214) also has 30 arms, and is similar to the preceding. 



The specimen from Bock's station 45 has the cirri XVI, 8-9, from 2 to 3 mm. 

 in length. The third and fourth cirrus segments are three times as long as broad. 

 The IBr, are three times as broad as long and laterally free. The IBr 2 (axillaries) 

 are twice as broad as long. The ossicles following the IBr axillaries are free interiorly. 

 The IIBr series are 4 (3 + 4), and the IIIBr series are 2. There are 13 arms 25 mm. 

 in length. The brachials have strongly everted serrate distal ends. The distal 

 brachials are from half again to twice as long as broad. P t to P 3 or P 4 have short 

 high combs composed of 4 or 5 teeth. PI is from 2.5 to 3 mm. long, with about 

 25 segments. The distal pinnules are from 4 to 5 mm. long with 12-14 segments. 

 None of the distal pinnules have combs. The disk is 2.5 mm. in diameter, and is 

 somewhat elevated. The mouth is central. The anal tube is short, stout, and 

 smooth, 0.8 mm. high and about the same in width. 



In the specimen from Bock's station 55 the cirri are XIV, 9-10, from 4 to 6 mm. 

 in length. The third and fourth cirrus segments are three times as long as broad. 

 The radials are visible as narrow bands. The IBr, are three times as broad as long 

 and laterally free. The IBr 2 (axillaries) are pentagonal, twice as broad as long. 

 The ossicles following the IBr axillaries are interiorly united. There are 3 IIBr 

 4 (3 + 4) series, and 2 IIIBr 2 series. The 15 arms are 45 mm. long. The distal 

 intersyzygial interval is 3 muscular articulations. The first 4 pinnules bear combs, 

 that on P, having 5 and that on P 2 4 teeth. Beyond P 4 there are occasional combs, 



