A MONOGRAPH OF THE EXISTING CRINOIDS 427 



IIIBr series are developed on the outer sides of the postradial series. The division 

 series are constricted ventrolaterally at the articulations, the lateral margins thereby 

 acquiring a knobby appearance. There are 28 arms. P 2 and P 3 are stiffened. P 2 

 is the longest pinnule and is composed of 13 segments. P 3 has 10 segments. The 

 disk is much incised, without calcareous granules, white spotted with brown. The 

 color otherwise is white, banded with brown, especially at the articulations. 



Of the three specimens from Bantayan Reef, Cebu, one has 30 arms, one has about 

 30 arms, and the third is fragmentary. In the specimen with 30 arms P[ is 11 mm. 

 long with 20 segments, P 2 is 17 mm. long with 15 segments, and P 3 is 11 mm. long 

 with 14 segments resembling P 2 but proportionately smaller. 



The specimen from Siboga station 99 has 20 arms 85 mm. long. The cirri are XXV, 

 22-23, 20 mm. long. P 2 is comparatively short, 11 mm. long, with 15 segments. 

 P 3 is 8 mm. long, with 13 or 14 segments. 



The specimen from the Pelew Islands has 30 arms 115 mm. long. The cirri 

 are 25 to 30 mm. long and consist of 20-23 segments, of which the longer proximal 

 are twice as long as broad and the shorter distal are slightly longer than broad. The 

 cirri are moderately slender and very long as in the specimen from Pitilu (see below), 

 though they are not quite so slender as in that individual. P! is 13 mm. long, slender 

 and flagellate, with 26 segments. P 2 is 15 mm. long, very stiff and spinelike, but 

 slightly more slender than usual, with 13 segments. P 3 is 12 mm. long, with 11 seg- 

 ments, and resembles P 2 . P 4 is 9 mm. long, with 11 segments, resembling P 3 but 

 much more slender. 



The example from Ruk has 31 arms 85 mm. long. The cirri are about 23 mm. 

 long and consist of 26-27 segments, of which the longest are usually not quite so 

 long as broad, rarely as long as broad, and the outermost 9 to 12 are broader than 

 long. The enlarged lower pinnules have 10 or 11 segments. P 4 is more like the 

 following pinnules than it is in the specimen from Pitilu (see below), and the shorter 

 and somewhat stouter cirri with shorter segments give this individual a somewhat 

 different appearance. 



The specimen from New Guinea has 15 arms about 60 mm. long. One IIIBr 

 series is developed externally. P 2 is 9 mm. long, with 10 greatly elongated segments. 

 P 3 is similar to P 2 but smaller, 6 mm. long, with 8 segments. P 4 has 8 segments, of 

 which the outer resemble those of the preceding pinnules; it is 4 mm. long and is 

 slightly stiffened. P 2 and P 3 are comparatively slender, possibly because of the small 

 size of the animal. 



The specimen from Pitilu, Admiralty Islands, has 27 arms 95 mm. long. The 

 cirri are XXX, 20-23, from 25 to 27 mm. long. The longest segments of the longer 

 cirri are twice as long as the median width, or somewhat longer. P! is 10 or 1 1 nun. 

 long, weak, and slender, with 17 or 18 segments. P 2 is stout and spinelike, 10 mm. 

 long, with 10 or 11 segments. P 3 is similar to P 2 but slightly smaller, 9 to 10 nun. 

 long, with 9 or 10 segments. P 4 is 7 nun. long, smaller than the preceding pinnules, 

 but stiffened. P 5 is 5 mm. long, with 10 segments. The following pinnules are 

 similar but slightly smaller and weaker. The distal pinnules are very slender, 9 mm. 

 long, with IS or 19 segments. 



