A MONOGRAPH OF THE EXISTING CRINOIDS 183 



is 2; there is a single IIIBr 3 (2 + 3) series, internally developed, bearing two arms, 

 one of which is about twice as large as the other. The other specimen has 20 arms 

 up to 80 mm. in length; of the 10 IIBr series 8 are 4 (3 + 4), and 2, both on the same 

 postradial series, are 2. 



The 2 specimens from Billiton recorded by Professor Koehler have 27 and 31 

 arms; neither has any IVBr series. 



In Grube's specimen from North Borneo (the type of borneensis) as described 

 by him, the centrodorsal is slightly concave, deepened in the middle. The cirri are 

 marginal. 



The cirri are XX, 22-28, and long. From the fifth onward the segments are 

 longer than broad; the last 12-18 segments bear 1 or 2 small dorsal spines. 



The IBri are visible. There are 1 IIBr series of 4 (3 + 4), and therefore 20 arms. 

 The brachials are somewhat broader than long, and only toward the base of the arms 

 are their distal ends slightly oblique, further out being parallel. Their distal edges 

 are set with fine spines. 



In the undivided arms the syzygies are between brachials 2 + 3, 13 + 14 (or 

 14 + 15 or 15 + 16), 19 + 20 (or 20 + 21), 26 + 27 (or 27 + 28), 33+34, 38 + 39, 44 + 45, 

 50 + 51, and 55 + 56. 



The lowest pinnule is on the IIBrj and the next is on the first brachial; both of 

 these, and also the foUowmg 2 or 3, are markedly longer than those following. 



The disk extends to the second arm division. The mouth lies between the 

 border and the center. The anal area is set with small calcareous concretions. 



The color is dark. 



Of the 2 specimens collected by Herr Pagel in British North Borneo, I has 

 about 25 arms 110 mm. long; the IIIBr series are all 3 (2 + 3), and all internal; the 

 other has 19 arms 85 mm. long, no IIIBr series being present. 



One of the specimens from Siboga station 90 has 18 arms 105 mm. long; there 

 are no IIIBr series present; the color is nearly black; the other has 14 arms 105 mm. 

 long; there are no IIIBr series; the color is light brownish gray with a narrow band 

 of very dark brown across each articulation. 



The largest specimen from Siboga station 133 has 15 arms 85 mm. long; 1 of the 

 IIBr series is 3 (2 + 3), the other 4 being 4 (3 + 4). Another has 19 arms 70 mm. 

 long; 2 of the IIBr series are 2, one of these bearing internally a IIIBr 2 series. A 

 third has 15 arms, there being 1 IIBr 4 (3 + 4) series on each ray. The fourth 

 specimen, which is small, has 11 arms. 



The specimen taken in the Sulu Sea in January, 1895, is rather small, mutilated, 

 and without a disk. It has about 23 arms. 



The 5 specimens dredged by Dr. Th. Mortensen off Jolo in about 36 meters on 

 March 21, 1914, are all typical. Of the 3 dredged on March 17, 1914, 1 has 33 arms: 

 of the 10 IIBr series 9 arc 4 (3 + 4) and 1 is 2. IIIBr series occur on the inner side 

 of each of the IIBr series, sometimes on the outer side also. The brachials are verj- 

 short with slightly oblique edges. A similar specimen has 27 arms. There are 9 

 IIBr series present, all 4 (3 + 4); there are 8 IIIBr series, all 3 (2 + 3), and all inter- 

 nally developed. The third specimen is somewhat smaller than the 2 preceding with 

 23 arms; of the 9 IIBr series present 8 are 4 (3 + 4) and 1 is 2; the 4 IIIBr series, all 



