PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 735 



the base of the succeeding segment, but this production is not everted, so that the pro- 

 file of the cirrus is not serrate. The opposing spine is small, arising from the entire 

 dorsal surface of the penultimate segment, with the apex terminal. The terminal claw 

 is slightly longer than the penultimate segment, moderately stout and moderately and 

 evenly curved. The apical cirri of the same specimen are exceedingly small and weak, 

 from 2 to 3 mm. long, with 8 to 10 segments. 



The radials are just visible beyond the run of the centrodorsal in the median line, 

 but extend well out into the angles of the calyx; their distal angles are slightly separated. 



The IBr! are very convex in dorsal profile; they are about five to six tunes as 

 broad as long; the distal angles are broadly rounded off and finely spinous. The lateral 

 edges converge distally. The rhombic IBr 2 (axillaries) are about as broad as long with 

 concave sides and the proximal angle broadly rounded. The lateral angles project 

 sideways so as nearly to meet the adjacent axillaries. This formation of the division 

 series produces a conspicuous water pore between them in each interradius. 



The 10 arms are broken off near the base in the type specimen; the first brachial is 

 very short, the inner two-thirds very narrow and bandlike, the outer third rapidly 

 decreasing in length so that the outer border is from three to four times as long as the 

 inner, or the median length; interiorly the bases of two adjacent first brachials are not 

 in apposition, and their inner edges diverge at rather more than a right angle. The 

 second brachial is irregularly quadrate, somewhat broader than long; the inner angles 

 of the two in each post-radial series are just in contact and, together with the widely 

 diverging inner edges of the first brachials, form large rhombic water pores similar to 

 those between the division series; the first syzygial pair is a little longer inwardly than 

 outwardly. The distal edges of the brachials are only slightly everted and finely 

 spinous. 



The width of the arm at the first syzygy is 1 .4 mm. and the length from the proximal 

 edge of the IBri to the second syzygy is 9.0 mm. in the type specimen. 



P, in the type has the first three segments broader than long, the fourth and fifth 

 slightly longer than broad and the remainder elongated, very much so distally. All 

 are incomplete. In the other specimen, Pj has 15 to 16 segments, 6.5 mm. long, with 

 the first four or five segments not longer than broad, the rest rapidly increasing hi 

 length so that the sixth is about twice as long as broad and those in the outer half of 

 the pinnule greatly elongated. The second and following segments have everted and 

 finely spinous distal ends. P 2 in this specimen is about the same length as PI, but is 

 considerably broader at the base and tapers less rapidly so that it is markedly stouter. 

 In the type, P 2 has about 15 segments and measures 7 mm. In the other specimen, P 3 

 is 6.5 mm. long with 13 segments, resembling P 2 but stouter basally. Both these pin- 

 nules have the outer segments greatly elongated and excessively slender. 



[NoTE BY A.M.C.] The above description was compounded from that of the type 

 and a manuscript description made by Mr. Clark from a specimen collected by the Dan- 

 ish Expedition to the Kei Islands at station 56, with a few additional notes on the 

 type by me. 



Localities. Siboga station 85; Makassar Strait (lat. O.36'30" S.,long. 11929'30" 

 E.); 724 meters [A. H. Clark, 1918] (1, Amsterdam M.). Type locality. 



Danish Expedition to the Kei Islands station 3; 245 meters; sand; March 3, 1922 

 (C.M.). 



Danish Expedition to the Kei Islands station 56; 345 meters; May 10, 1922 (C.M.). 



