A MONOGRAPH OF THE EXISTING CRINOIDS 55 



The lateral fourths of the dorsal surface are covered rather thickly with fine short spines 

 like the lateral thirds of the IBr^ The synarthrial tubercles are low and only slightly 

 marked. The division series are only slightly convex dorsally, sharply flattened 

 laterally, and in very close apposition. The IIBr series are 2, the component ossicles 

 resembling those of the IBr series, but with the proximal and distal borders more finely 

 spinous and the spinous modification of the lateral portion of the dorsal surface rela- 

 tively narrower exteriorly and very narrow interiorly. 



The 20 arms are from 95 to 100 mm. long. The spinous modification of the lateral 

 portion of the dorsal surface of the ossicles of the division series runs up in a very narrow 

 and progressively narrowing band both internally and externally as far as the third or 

 fourth brachial. The proximal oblong brachials have very slightly everted edges. As 

 the brachials become triangular serrate longitudinal striations appear, first only in the 

 median line, but soon over the entire dorsal surface of the brachials, which have slightly 

 overlapping and spinous distal edges. 



The specimen from Siboga station 254 is similar to that from station 253 just 

 described. There are 20 arms about 95 mm. long. The cirri have 56-60 segments 

 and are 35-40 mm. long. 



Of the three specimens from the Danish Expedition to the Kei Islands station 12 

 one has 19 arms about 100 mm. long and the longest cirri 45 mm. long with 59 segments. 

 The two others have 20 arms about 100 mm. long. 



The specimen from the Danish Expedition to the Kei Islands Station 56 has 20 

 arms 105 mm. long. The longest cirri have 53-59 segments. 



Localities. — Albatross station 5424; Jol<5 (Sulu) Sea; Cagayan Island (S.) bearing 

 S. 11° W., 3.4 miles distant (lat. 9°37'05" N., long. 121°12'37" E.); 621 meters; bottom 

 temperature 10.2° C; coral sand; March 31, 1909 [A. H. Clark, 1911, 1912; H. L. Clark, 

 1916] (3, U.S.N.M., 35597). 



Albatross station 5523; in the vicinity of northern Mindanao; Point Tagolo Light 

 bearing S. 48° W., 6.7 miles distant (lat. 8°48'44" N., long. 123°27'35" E.); no further 

 data; August 10, 1909 [A. H. Clark, 1911, 1912; H. L. Clark, 1916] (1, U.S.N.M., 27497). 



Siboga station 95; northwest of the Tawi Tawi Islands, Sulu (Jol6) Archipelago 

 (lat. 5°43'30" N., long. 119°40'00" E.) ; 522 meters; stony bottom; June 26, 1899 [A. H. 

 Clark, 1918] (1, Amsterdam Mus.). 



Menado Bay, northern Celebes (lat. 1°31' N., long. 124°47' E.); 457 meters; Capt. 

 H. Christiansen, Great Northern Telegraph Company, March 12, 1913 (8, U.S.N. M., E. 

 3214; CM.). 



Siboga station 253; Kei Islands (lat. 5°48'12" S., long. 132°13'00" E.); 304 meters; 

 gray clay, hard and crumbly; December 10, 1899 [A. H. Clark, 1912, 1918] (1, Amster- 

 dam Mus.). 



Siboga station 254; Kei Islands (lat. 5°40' S., long. 132°26' E.); 310 meters; fine 

 gray mud; December 10, 1899 [A. H. Clark, 1918] (1, U.S.N.M., E. 454). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 12; 320 meters; 

 sand; April 9, 1922 (3, U.S.N.M., E. 3145; C. M.). 



Danish Expedition to the Kei Islands; Dr. Th. Mortensen; station 56; 245 meters; 

 May 10, 1922 (1, C. M.). 



Geographical range. — From the Philippine Islands south to Celebes and the Kei 

 Islands. 



