A MONOGRAPH OF THE EXISTING CRINOIDS 167 



more markedly unequal sides, the longer of which is longer than the width. There 

 are about 120 brachials of which the middle ones are nearly square and the terminal 

 are elongated. Syzygies occur between brachials 3+4, 8+9, and 13 + 14 (in one case 

 12+13) and distally at intervals of 3 muscular articulations. Carpenter expressed 

 this as follows: "Second syzygy on the fifth brachial, the next on the ninth, and the 

 next on the thirteenth (once on the twelfth) brachial; after this an interval of two 

 joints between successive syzygia." P c is quite small, consisting of about a dozen 

 short segments of which the basal are rather broad. Pi is somewhat longer and 

 stouter. P a and P 2 are very much longer and stouter, with longer and more massive 

 segments. The next three or four pinnules on each side gradually decrease in size, 

 and the following ones increase again, the terminal ones being very long and slender 

 so as to give the arms a very feathery appearance. The disk has been lost, but it 

 must have been somewhat less tban 3 mm. in diameter. The sacculi are tolerably 

 close on the arms, but much larger and more closely set at the sides of the pinnule 

 ambulacra, which have only the very slightest trace of any superficial limestone 

 deposits. 



Carpenter said that this is a very slender and graceful little species, differing 

 altogether in appearance from those dredged by the Challenger (that is, Pentametro- 

 crinus varians, P. semperi, and P. japonicus). 



This specimen subsequently came into the possession of W. Percy Sladen. It 

 was later examined by Dr. P. H. Carpenter, who mentioned that the color of the skele- 

 ton was brownish white, and still later, in January 1894, it was examined by Prof. F. 

 Jeffrey Bell, who found that it had become quite white. 



The five specimens dredged by the Albatross at station 5356 all have the arms 

 about 85 mm. long. 



In the specimen from Willebrord Snellius station 60* P a and P 3 are 7 mm. long 

 with 12-14 segments. 



The specimens from Siboga station 257 are small. The brachials, except the 

 basal, show a strong production of the distal edge. 



The individuals from Siboga station 260 have the arms 35 and 40 mm. long. 



The three specimens from the Danish Expedition to the Kei Islands station 26 

 have the arms up to 50 mm. long. There is a tendency to an eversion of the central 

 portion of the distal ends of the elements of the IBr series and the earlier brachials. 



The two specimens from Siboga station 144 are small and, like those from station 

 257, have the brachials, except the basal, with a strong production of the distal edge. 



Of the three specimens from Siboga station 305 one has the arms 80 mm. long, the 

 cirri XVIII, 17, 11 mm. long, and the pinnules of the second pair 6 mm. long with 

 11 or 12 segments. Another has the arms 95 mm. long, the cirri XVII, 16-17, 13 mm. 

 long, and the second pair of pinnules 7 mm. long with 12 or 13 segments. The third 

 specimen is similar to the first. 



The two specimens from Siboga station 65a are small with the arms 25 to 30 mm. 

 long. 



Localities. — Dr. Sixten Bock's Expedition to Japan station 59; Bonin Islands, 

 eastnortheast of Anojima; 183 meters; August 15, 1914 [Gisl6n, 1922, 1924]. 



Macclesfield Bank; 62-73 meters [Bell, 1894; A. H. Clark, 1907, 1908, 1912, 1913] 

 (1, B. M.). 



