A MONOCnAPH OF THE EXISTING CRINOIDS 659 



One of the specimens from a coral reef off Jolo lias 20 arms. The other is very 

 small, with about 13 arms. The example from off Jolo in about 3G-55 meters has 

 29 arms about 70 mm. long. Of the 10 IIBr series, 9 are 4 (3 + 4) and 1 is 2. Of the 

 9 IIIBr series, 5 are 4 (3+4) and 4 are 2. The cirri are VIII, 10-11, 5.5 mm. long, 

 confined to the interradial angles of the centrodorsal where they occur in 3 pairs, with 

 2 additional occumng individually. 



Some of the 21 examples from Siboga station 99 have the following characters: 



The 28 arms are 70 mm. long. All the division series are 4 (3 + 4). There are 

 V cin'i. 



There are 23 arms, 10 IIBr series and 3 IIIBr series being present. Of the IIIBr 

 series, 2 are developed externally and 1 is developed internally. All the division 

 series are 4 (3 + 4). There are VI cirri. 



There are 20 arms. 



The arms are 13 in number. 



Four of the specimens have 12 arms from 20 to 35 mm. long. 



Three individuals have 1 1 arms from 20 to 30 mm. in length; one of these is under- 

 going adolescent autotomy. 



Nine examples have 10 arms varying from 13 to 20 mm. in length, and tlie lower 

 pinnules more or less deficient. 



The specimen taken at the surface at Siboga station 99 is very small, with 10 

 arms. 



One of the specimens from Tataan has all the IIBr series 2. 



The 2 specimens from the Jolo Archipelago in the Hamburg Museum have each 

 some of the arms greatly lengthened and attenuated. 



The examples secured at Siboga station 96 show the following characters: 



The 25 arms are 45 mm. long. Of the IIBr series, 5 (on 3 rays) are 2 and 5 are 4 

 (3 + 4). On 1 ray 2 IIBr series of 2 each bear 2 IIIBr series. There are IV small 

 and weak cirri. 



The 22 arms are 65 mm. long. There are 3 IIBr 2 series, all the other division 

 series being 4 (3 + 4). There are V small weak cirri 4 mm. long. 



The 20 arms are 70 mm. long. All the IIBr series are present, and all are 4 

 (3 + 4). 



The 14 arms are 25 mm. long. 



There are 12 arms 30 mm. long, 13 arms 30 mm. long, and 10 arms 17 mm. 

 long. 



The example taken in plankton collecting at Siboga station 96 has 10 arms 17 

 mm. long. 



The specimens from North Borneo described by Grubo under the name of 

 Comatula mertensi have the centrodorsal with a single row of cirri. 



The cirri are XIII (XVI), 11-13. The first 3 segments are as long as broad, 

 those following are longer than broad, and the last 4 are again as long as broad. 

 The 3 preceding the penultimate bear a sharp dorsal tubercle, and the penultimate 

 bears an opposing spine. 



There are 2 radials, the axillary with a syzygy. [Undoubtedly this means that 

 the radials are 'dsible, and that the 2 elements of the IBr series are very closely 

 united.] The IIBr series are 4 (3 + 4). 



