A MONOGRAPH OF THE EXISTING CRINOIDS 195 



between brachials 36 + 37, and those following are very irregularly placed at intervals 

 of sometimes only 4, often 6 or 7, sometimes as many as 18, muscular articulations. 

 Pi (on the first brachial) is almost as long as the pinnules on the division series, 

 measuring about 14 mm. The disk, which is 15 mm. in diameter, bears numerous 

 scattered calcareous concretions, especially in the anal area. 



In the smaller specimen from the Aru Islands described imder the name of 

 C. clarki by Reichensperger one ray bears 2 IIBr series each of a single axillary 

 ossicle; the IIBr series to the left bears outwardly (to the left) a IIIBr 2 series, and 

 inwardly (to the right) a IIBr 3 (2 + 3) series; the IIBr series to the right bears out- 

 wardly (to the right) a IIIBr 3 (2 + 3) series and inwardly (to the left) an undivided 

 arm. Another ray bears to the right a IIBr series consisting of a single axillary 

 ossicle followed by 2 undivided arms and to the left a IIBr 2 series bearing 

 inwardly an undivided arm and outwardly a IIIBr 3 (2 + 3) series. A third 

 ray bears 2 IIBr 2 series, each of which bears to the right a IIIBr 4 (3 + 4) series; 

 the IIBr series to the left bears outwardly a brachial followed by a syzygial pair 

 beyond which the arm is broken off; that to the right has the succeeding ossicles 

 broken away at the axillary face. In the first ray described the arms following the 

 IIIBr series furthest to the right have the first syzygy between brachials 2 + 3; the 

 undivided arm on the inner face of the same IIIBr axillary has the first syzygy 

 between brachials 1+2; of the two arms following the inner (right hand) IIIBr 

 series from the left IIBr series that to the right has the first syzygy between brachials 

 1+2 and that to the left has the first syzygy between brachials 2 + 3. In the second 

 ray the undivided arms following the IIBr series to the right have in that to the right 

 (outer) the first syzygy between brachials 2 + 3 and the second between brachials 

 7 + 8, and in that to the left (inner) the first 'syzygy between brachials 1+2; the 

 undivided arm on the inner (right) side of the IIBr series to the left has syzygies 

 between brachials 1+2 and 3 + 4 ; the 2 undivided arms following the IIIBr series 

 on the outer (left) side of the IIBr series to the left have in that to the right the first 

 syzygy between brachials 2 + 3 and in that to the left no syzygies before the fifth 

 brachial at which point the arm is broken off. In the third ray the arm on the left 

 hand face of the left IIBr axillary and that on the left-hand face of the axillary of 

 the IIIBr series on the right-hand face of the same IIBr axillary, which are the only 

 arms preserved, both have the first syzygy between brachials 2 + 3. 



The specimen from Albatross station 5355 is small, with the arms about 70 mm. 

 long. The right anterior radial is axillary, giving rise to 2 IBr series, 1 with 1 IIBr 

 series and 3 arms, the other with 2 IIBr series and 4 arms. The 2 IBr series arising 

 from the axillary radial diverge just as IIBr series diverge from a IBr axillary so that 

 the anterior and the right posterior rays are much crowded. The left anterior ray 

 is nearly twice the normal size, but of the 5 arms which it bears only one, which 

 springs undivided from the IIBr axillary, is enlarged; the others, however, have just 

 finished undergoing adolescent autotomy and may not yet have reached their full 

 size. 



In the specimen from Dirk Hartog Island, Western Australia, the mouth is 

 considerably nearer the center of the disk than usual, and the anal area bears numer- 

 ous scattered calcareous granules. About the margin of the disk there are several 



