PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 737 



Locality. — Siboga station 251; southeast of Ceram Qui. 5°28'24" S., long. 132°- 

 00'12" E.); 204 meters; hard coral sand; December 8, 1899 [A. H. Clark, 1912, 

 1918] (1, Amsterdam M.). 



FARIOMETRA NICIPPE (A. H. Clark) 



Nepiometra nicippe A. H. Clark, Ann. Mag. Nat. Hist., ser. 10, vol. 10, No. 58, 1932, p. 378 (listed), 

 p. 386 (south of Lorabok; 600 fms.; description; comparison); Proc. Biol. Soc. Washington, vol. 

 47, 1934, p. 10. 



Diagnostic features. — The cirri have 19 to 21 segments, of which the longest are 

 two to three times as long as their median widths; both the division series and the 

 first two brachials of each pair of arms arc modified to form water pores between 

 those of adjacent series; the centrodorsal is low conical, about two-thirds as high as 

 wide at the base; P, and P2 both have about 20 segments and are similar in length, 

 though Pj is stouter and bears a gonad; the two fu-st brachials of each pair of arms 

 are in close contact. 



Description. — The centrodorsal is largely concealed by the bases of the numerous 

 cirri. It is probably about 2.5 mm. wide at the base and over 1.5 mm. high. The 

 cirrus sockets are arranged in three and a partial fourth closely crowded rows. The 

 dorsal pole is finely papillose. 



The cirri are about L, 19-21, up to 13 mm. in length. The second segment is about 

 as long as its raa.ximum diameter at the distal end and the fifth to about the eighth 

 or ninth are twice as long as the maximum width, or longer. The following segments 

 decrease in length so that the outermost ones are only about a thii'd as long again as 

 broad. In dorsal view each segment appears to be expanded at the pro.ximal as well 

 as the distal end, but in side view only a distal expansion is evident, the longer seg- 

 ments having quite flared, overlapping, and finely spinous distal ends. 



The distal edges of the radials, which are rather strongly concave, are even with 

 the rim of the centrodorsal. The IBri are very short and bandlike, seven or eight 

 times as broad as long. The proximal and distal edges are slightly and narrowly 

 thickened and the lateral edges are somewhat produced, broadly rounded, and in 

 contact basally. The IBr2 (axillaries) are triangular, nearly twice as broad as long, 

 with the distal sides slightly concave and the middle of the proximal border broadly 

 convex. Their lateral angles are nearly in contact so delimiting a small but distinct 

 water pore between them and the two preceding IBri. 



The 10 arms were about 50 mm. long. From the edge of the radial to the second 

 syzygy (9-|-10) is 7 mm. and to the third syzygy (14 + 15) is 10 mm. The first 

 brachials are short, wedge-shaped, and about three times as long exteriorly as interiorly. 

 Their inner sides are in close contact and their outer sides are covered ^vith densely 

 packed excessively fine spinules. The pro.ximal and distal edges are slightly everted 

 and are covered ■with excessively fine spinules. The second brachials are larger tlian 

 the first, irregularly quadrate and wider than long. There is a rather conspicuous 

 water pore beneath the apposed inner angles of the second brachials of cacli pair of 

 arms. The first sj'zygial pair (34-4) is longer interiorly than exteriorlj', and is half 

 again as broad as long in the median line. The next four brachials are oblong, but 

 with their borders curved broadly outward to the ends of the fulcral ridges, and are 

 about twice as broad as the median length. After the second syzygy the brachials 

 are triangular, about as long as broad, later becoming very obliquely wedge-shaped 



