360 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



long though not quite so broad and bears a slightly rounded carinate process. The 

 third is about half again as long as broad. P3 is 15 mm. long with 17 segments which 

 are more elongate than those of P2, being nearly or quite three times as long as broad. 

 The pinnule is in general similar to P2 but is very slightly stouter with the first two 

 segments only very slightly enlarged and the second with the carinate process much 

 reduced. The third segment is narrowly carinate, at least basally. P4 is 11 mm. long 

 with 15 segments, those beyond the third very long, and the second-fourth slightly 

 carinate. P5 is 9 mm. long with 13 segments, resembling P4 but with slightly shorter 

 segments. 



Locality. — Siboga station 305; Lesser Sunda Islands; Solor Strait, midchannel, 

 off Kampong Menanga; 113 meters; stony bottom; February 8, 1899 [A. H. Clark, 

 1912, 1918] (4, U.S.N.M., E. 429; Amsterdam Mus.) 



Remarks. — ^This species is known only from the four specimens collected by the 

 Siboga in 1899. 



NEOMETRA DIANA (A. H. Clsrk) 



Plate 37, FiotrRES 195, 196 

 [See also vol. 1, pt. 2, fig. 200 (lateral view), p. 130.]. 



Calometra diana A. H. Clark, Zool. Anz., vol. 39, 1912, No. 11/12, p. 422 (description; Siboga 

 station 294). 



Neometra diana A. H. Clark, Unstalked crinoids of the Siboga-Exped., 1918, p. VIII (a new type 

 discovered by the Siboga), p. 132 (in key; range), p. 133 (detailed description; stations 260,294), 

 p. 275 (listed), pi. 22, figs. 55, 56.— Gisl£n, Zool. Bidrag Uppsala, vol. 9, 1924, pp. 88, 90 (synar- 

 thrial tubercles); Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 20. 



Neometra {Calometra) diana Gisl£n, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 

 1922, p. 96 (characters of the lower pinnules). 



Diagnostic features. — In this species the synarthrial tubercles are greatly elongated 

 and very conspicuous, as high as broad at the base, and the cirri are long, nearly half 

 as long as the 16-17 arms, with 42-50 segments of which the longest are twice as long 

 as broad. 



Description — The centrodorsal is thin discoidal with the flat dorsal pole 3.5 mm. 

 in diameter. The cirrus sockets are arranged in a single fairly regular marginal row. 



The cirri are XVI, 42^3, from 30 to 38 mm. long, rather slender, resembling 

 those of Calometra discoidea. The fifth-tenth segments, wliich are the longest, are 

 about twice as long as broad. The distal fifteen or sixteen are slightly broader than 

 long, but the cirri taper slightly at the tip so that the last three before the penulti- 

 mate are as long as broad or sHghtly longer. The earlier segments show a shght 

 tendency to become centrally constricted, and the short distal segments possess the 

 usual high carinate dorsal spines. 



The radials are short in the median line but extend far up in the angles of the 

 calyx where they form a broad process with parallel sides and a straight or convex dis- 

 tal border which entirely and widely separates the bases of the IBr,. In width this 

 anterior process from the radials is equal to about half the length of the ventrolateral 

 edge of the IBr,. The IBrj are oblong, nearly or quite three times as broad as long, 

 with the ventrolateral edge produced into a thin flangelike border with a smooth 

 outer edge which is about twice as wide proximaUy as distally, proximally being even 

 with the distal edge of the radial process. The IBrj (axillaries) are broadly pentag- 



