734 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



the arm tip produced into a high triangular process. The sixth segment is slightly 

 longer than broad, without a carinate process. The segments following gradually 

 increase in length so that the outer are greatly elongated, about six tunes as long as 

 their expanded ends. The pinnule is long and very slender, becoming filiform distally. 

 The distal ends of the segments are produced and finely spinous. 



P a is longer, probably about 13 mm. long and with 25 segments; the 21 segments, 

 which are the most that remain, measure 12 mm. The segments are relatively more 

 attenuate than those of PI. 



P 2 is slightly stouter than PI, 7 mm. long and with 14 segments, of which the first 

 is rhombic, twice as broad as long, after which the length increases so that the fourth is 

 slightly longer than broad and the fifth is half again as long as broad. The segments 

 following are more slender and attenuate. The third and following segments have 

 everted and finely spinous distal ends. A large fusiform gonad occupies the entire 

 inner border of the sixth to eighth segments. 



Locality. John Murray Expedition station 143; Maldive area (from lat. 515'48" 

 N., long. 7322'48" E. to 513'42" N., 7323'36" E.); 797 meters; at 770 meters, 

 temperature 7.88 C.; bottom, sand [A. H. Clark, 1937] (1, B.M.). 



Remarks [by A.M.C.]. Mr. Clark compared this species with Fariometra dione 

 from the Moluccas, but when fitting it into the key I found that it has more in common 

 with F. obscura from off the adjacent Laccadives, only the lower centrodorsal serving 

 as a slight distinction as far as is known, since the cirri and pinnules of the single 

 specimen of obscura were lost. 



FARIOMETRA DIONE A. H. Clark 



Fariometra dione A. H. CLARK, Journ. Washington Acad. Sci., vol. 7, No. 5, 1917, p. 130 (listed); 

 Unstalked crinoids of the Si'6o0a-Exped., 1918, p. 249 (in key; range), p. 250 (detailed description; 

 sta. 85), p. 272 (listed), pi. 26, fig. 85; John Murray Exped. 1933-34, Sci. Reports, vol. 4, No. 4, 

 1937, p. 97 (comparison with F. sewelli). 



Diagnostic features. The centrodorsal is conical, in the type it is 2.2 mm, high by 

 2.6 mm. basal diameter; the cirri are XLV-C, with up to 21 segments, at least when the 

 smaller number is present; the longest segments are up to three times as long as their 

 median widths; the sides of the IBri converge distally and the lateral angles of the 

 axillaries are produced beyond them defining a water pore in each interradius ; the two 

 first brachials of each pair of arms are not in contact inwardly; PI has about 16 segments, 

 of which the first three are broader than long; P 2 and P 3 are stouter than P, but similar 

 to it in length. 



Description. The centrodorsal is conical, the sides practically straight, just 

 curving hi at the base; in the type it is 2.6 mm. in basal diameter, 2.6 mm. from the 

 apex to the interradial border and 2.2 mm. in vertical height. The type also has about 

 100 cirrus sockets almost completely covering the centrodorsal [arranged in fairly 

 distinct vertical rows A.M.C.]; all the cirri are lost. In another specimen the cirri 

 are given as XLV-L, 17-21, and up to 15 mm. long. In the long peripheral cirri the 

 first segment is very short, the second is twice as broad as long, the third is slightly 

 longer than broad, the fourth is twice as long as its median width or even longer, and 

 those following are between two and a half and three times as long as broad. After 

 the eighth the length decreases, so that the terminal four or five are only very slightly, 

 if at all, longer than broad. The segments from about the twelfth onward have the 

 dorsal surface sharply carinate and the distal dorsal edge slightly produced, overlapping 



