A MONOGRAPH OF THE EXISTING CRINOIDS 197 



IS short, those following gradually increasing in length and becoming slightly longer 

 than broad on the third and about twice as long as broad distally; the distal edges of 

 the outer segments are slightly spinous. Pj is 3 mm. long, stiff and spinelike though 

 slender, tapering slowly from the base to the tip, composed of 8 or 9 segments of which 

 the first is twice as broad as long, the second is nearly as long as broad, the third is 

 nearly twice as long as broad, and the remainder are about three times as long as 

 broad; the third and following bear long and prominent spines at the prismatic angles; 

 the pinnule is rather strongly prismatic. P3 is 2 mm. long, small and slender, slightly 

 stiffened, composed of 8 segments which become elongated distally. P4 is 1.25 mm. 

 long, very delicate and not stiffened, composed of 9 segments which become much 

 elongated distally. P^ is similar to P4 but shghtly shorter. The distal pinnules are 

 2.5 mm. long, exceedingly slender and delicate, composed of 13 segments of which the 

 second and third are strongly carinato and the outer are very greatly elongated. 



The disk is thicldy sprinkled, or almost covered, with small rounded plates. 



Notes. — Some specimens show a much greater development of the spines on the 

 lower segments of the pinnules than others. 



The specimen from Siboga station 79a has the arms about 15 mm. long, and 11 or 12 

 ciiTus segments. The specimen from Siboga station 144 has the arms about 20 mm. 

 long. The specimen from Siboga station 260 has the arms 18 mm. long and the cu-ri 

 with 11 segments. 



Localities. — Albatross station 5248; Gulf of Davao, Phihppine Islands; Lanang 

 Point bearing S. 33° W., 0.4 miles distant (lat. 7°07'25" N., long. 125°40'24" E.); 

 33 meters; coral; May 18, 1908 [A. H. Clark, 1918] (1, U.S.N.M., 3603S). 



Siboga station 79a; Borneo Banlc (lat. 2°38'30" S., long. 117°46'00" E.); 54 

 meters; fine coral sand; June 12, 1899 [A. H. Clark, 1918] (1, Amsterdam Mus.). 



Siboga station 117; entrance to Kwandang Bay, Celebes (lat. 1°00'30" N., long. 

 122°56'00" E.); 80 meters; sand and coral; July 12, 1899 [A. H. Clark, 1912, 1918] 

 (24, U.S.N.M., E. 406; Amsterdam Mus.). 



Siboga station 260; 2.3 miles N. 63° W. from the northern point of Nuhu Jaan, 

 Kei Islands (lat. 5°36'30" S., long. 132°55'12" E.); 90 meters; December 16-18, 

 1899 [A. H. Clark, 1918] (1, Amsterdam Mus.). 



Siboga station 144; anchorage north of Salomakiee (Damar) Island; 45 meters; 

 coral and hthothamnion; August 7-9, 1899 [A. H. Clark, 1918] (1, Amsterdam Mus.). 



Geographical range. — From the Philippine Islands to Celebes, Borneo Bank, the 

 Kei Islands, and Salomakiee (Damar) Island. 



Bathy metrical range. — From 33 to 90 meters. 



History. — This species was first described by me in 1912 under the name Prometra 

 minima from 24 specimens that had been dredged by the Siboga at station 117. It 

 was redescribed and figured in 1918, when additional specimens were recorded from 

 Siboga stations 79o, 144, and 260, and Albatross station 5248. 



DECAMETRA LAEVIPINNA (A. H. Clark) 



Plate 22, Figure 109; Plate 25, Figures 129, 132 



lAntedon sinensis Hartlaub, Mem. Mus. Comp. ZooL, vol. 27, No. 4, 1912, p. 280 Oisted), p. 378 



(detailed description; Hong Kong), pi. 13, fig. 4. 

 Prometra laevipinna A. H. Clark, Ann. Mag. Nat. Hist., ser. 6, vol. 10, 1912, p. 37 (description; 



Salayer) . 



