A MONOGRAPH OF THE EXISTING CRINOIDS 135 



long, with about 30 segments. P 4 is 10 mm. long, with 29 segments. The first six 

 pinnules have a sharp keel on the first-fourth or -fifth segments, this feature becoming 

 less pronounced on the more distal pinnules. P 8 is 5.3 mm. long with about 18 

 segments. There are three or four sacculi to each pinnule segment. 



In the second specimen from Mortensen's station 10 the centrodorsal is 3.8 mm. 

 hi diameter, with the bare dorsal pole 2 mm. in diameter. The cirri are XXIV, 

 16-19, from 9 to 16 mm. long. The radials are 10 times as broad as long, and the 

 IBrj are eight times as broad as long. The 10 arms are all broken. Slight syn- 

 arthrial tubercles are present. 



The specimen from off the Goto Islands in 80 meters has 11 arms about 40 mm. 

 long. The single IIBr series is 2. 



Of the two specimens from off the Goto Islands hi 66 meters, one is just passing 

 from the 10-armed young stage to the adult condition. There are 13 arms 75 mm. 

 long, three IIBr 4(3+4) series being present. Of the three IIBr series, two are of 

 nearly full size while the third is very small, showing that adolescent autotomy had 

 taken place not long before capture. In this specimen there is the same overlapping 

 of the brachials and roughness of the dorsal surface of the arms as in the type, and the 

 relative proportions of the proximal pinnules and of their component segments is 

 similar, though the segments of the pinnules in the proximal third of the arm have 

 rather more prominent distal ends and the lower segments of the first three or four 

 pinnules are rather more strongly carinate. The cirri are XIX, and measure 13 mm. 

 in length. As in the type they are arranged in one and a partial second crowded 

 and irregular marginal row on the discoidal centrodorsal. The cirri show the char- 

 acteristic somewhat abrupt expansion at the articulations, and consequently the 

 same knobby appearance, as the cirri of the type, but the component segments are 

 slightly shorter, none of them being quite so long as broad. The opposing spine, 

 well marked as hi the type, is characteristically small. 



The other specimen is small with 12 arms about 45 mm. long. The cirri are 

 XX, and measure 12 mm. in length. They are arranged hi a single marginal row on 

 the centrodorsal. The centrodorsal is thin and discoidal, the slightly concave broad 

 bare polar area 4 mm. hi diameter. 



The best of the five specimens from 8 miles off Hongkong has 13 arms 100 mm. 

 long, the3 IIBr series being 4 (3+4). The cirri are XXVII, 16-17, about 15mm. long; 

 the longest proximal cirrus segments are nearly or quite as long as the median width 

 as viewed laterally. A second specimen has 12 arms about 110 mm. long, the 2 

 IIBr series being 4 (3+4). The cirri are XXVIII, 15, about 13 mm. long. A third 

 example also has 12 arms with the two IIBr series 4 (3+4). There are 14-16 cirrus 

 segments. A small specimen has 10 arms 60 mm. long. The fifth specimen is much 

 broken. The color in life appears to have been bright yellow broadly banded with 

 bright red, as in the type. These specimens agree with the type and with other from 

 southern Japan with which they were compared. 



Localities. Dr. Th. Mortensen's Expedition to Japan station 2; Misaki, shore 

 (but probably taken hi dredging) ; April, 1914 [Gislen, 1927]. 



Dr. Th. Mortensen's Expedition to Japan station 10; off Kiu Shiu (lat. 3341' N., 

 long. 12850' E.); 137 meters; sand; May 17, 1914 [Gislen, 1927]. 



