A MONOGRAPH OF THE EXISTING CRINOIDS 165 



P D is nearly 30 mm. long, moderately stout at the base but soon becoming more 

 slender. The length of the succeeding pinnules decreases to about P 5 , which is not 

 especially small, and slowly increases distally. The lowest pinnules have a large 

 terminal comb involving 12-15 segments which may extend as far as P 14 . The edges 

 of the pinnule segments are fringed with spines. 



The mouth is radial, or nearly so, and the disk is naked or bears a few calcareous 

 nodules. 



The specimen from Siboga station 240 (Banda) is small with 17 arms and is 

 undergoing adolescent autotomy. The left posterior and left anterior rays are in 

 process of multiple division; the former has one IIBr 4 (3 + 4) series which bears 

 internally a IIIBr 3 (2 + 3) series carrying two IVBr 3 (2 + 3) series; the latter has 

 one IIBr 4 (3 + 4) series which bears a IIIBr 3 (2 + 3) series externally and a IIIBr 

 4 (3 + 4) series internally, the former carrying on the left (innermost) side a IVBr 

 3 (2 + 3) series. The specimen is slender and delicate. 



Of the two specimens collected by the Endeavour between Fremantle and Gerald- 

 ton, Western Australia, one is small, but typical, with 73 arms. One of the IIBr 

 series is 2, the remaining 9 being 4 (3 + 4). The following division series are all 



3 (2 + 3). 



The other specimen has 33 arms 115 mm. long. There are 9 IIBr series, all 



4 (3+4), and 13 IIIBr series, all 3 (2 + 3). The centrodorsal is typically large and 

 hemispherical. The cirri are composed of 28-30 segments and are from 27 to 30 mm. 

 in length. 



The specimen from Amboina is typical with about 70 arms 140 mm. long. Of 

 the 10 IIBr series, 6 are 4 (3+4) and 4 are 2. 



The example from the Danish expedition to the Kei Islands station 14 is small 

 with 58 arms and is just beginning to acquire the adult characters. Of the 3 specimens 

 from station 26, one is typical with about 70 arms which are about 105 mm. long; 

 two of the IIBr series are 2; the cirri are XVI, 32-35, from 30 to 35 mm. long. 

 A similar specimen has one of the IIBr series 2. The third specimen is small with 

 12 arms, both of the IIBr series being 4 (3 + 4). 



The specimen from the Moluccas collected by Pe>on and Lesueur, which I 

 examined in Paris, has apparently exactly 40 arms; the cirri have 29-34 segments. 

 Carpenter remarked (1882) that in this specimen there is a tolerably well-marked 

 median tubercle at the junction of the IBr t and IBr 2 , while the intersyzygial interval 

 appears to be 11-14 muscular articulations. 



Quoy and Gaimard's specimen from the Moluccas has about 50 arms, and the 

 cirri have 27-30 segments. Carpenter noticed (1882) that in this individual the 

 pinnules on the IIBr and IIIBr series have a slight keel on the second and third seg- 

 ments, traces of which sometimes extend outward along the arms as far as the seventh 

 brachial. This does not occur in the two Challenger specimens from Banda. 



The specimen from Siboga station 79 has about 80 arms which are 130 mm. in 

 length. The cirri are 35 mm. long with 37-38 segments. 



The specimen from Cebu is large with the brachials and the elements of the 

 outer division series strongly everted distally. 



Of the 3 specimens collected by Dr. Th. Mortensen off Jolo, that from about 22 

 meters has about 60 arms about 110 mm. long; on each IIBr series the arms are in 



