A MONOGRAPH OF THE EXISTING CRINOIDS 31 



height equaling half the width of the penultimate segment. The terminal claw is 

 thick and curved and is a little longer than the penultimate segment. The IBri are 

 four times as broad as long. The IBr 2 (auxiliaries) are pentagonal, twice as broad as 

 long, and form a small but distinct synarthrial tubercle with the IBri. The IIBri are 

 interiorly united. The IIBr 2 (axillaries) are similar to the IBr 2 . IIIBr series are 

 present in at least five cases. The ossicles of the division series have ventrolateral 

 processes. The 21 + arms are 110+ mm, long (detached arms are 140 mm. long) and 

 are much broken. The distal ends of the brachials are a little thickened with a 

 slightly spiny edge, these produced ends breaking the even profile of the arms. The 

 second syzygy is at about the twentieth brachial, and the distal intersyzygial interval 

 is about 10 muscular articulations. PI is 11 mm. long with about 30 segments; it is 

 slender and smooth basally, the last 10 segments widened and spiny distally, thus 

 forming spiny crowns wider than the base of the segment following. Pa is 14.5 mm. 

 long with 23 segments, very stout and hornlike; from the eighth segment onward 

 there is a tuft of spines on the distal outer side of each segment, this tuft broadening to 

 a semicircle on the outer segments. P 3 is 6.5 mm. long with 16 segments and, like 

 the pinnules following, is almost smooth with traces of distal crowns on the proximal 

 segments. The second-fourth segments of the proximal pinnules have a prominent 

 crest on the outer side which is interrupted at the articulations. The distal pinnules 

 are 11 mm. long with about 28 segments. The disk, which is detached, is very much 

 incised; the smallest diameter is 5.5 mm., the largest 11.5 mm. The color is dark 

 purplish, the distal portion of the arms brownish dorsally with large purple blotches. 



Another specimen from Jaluit has the dorsal pole of the centrodorsal concave, 

 and the cirri arranged hi 2-3 closely crowded rows. The cirri are XL VII, 38-42, from 

 25 to 28 mm. long. IIIBr series are present in at least 10 cases. The ventrolateral 

 processes on the arm bases are prominent. There are 29+ arms, all broken. 



In a third specimen from Jaluit the cirri are XXII, 26-32, from 14 to 17 mm. long. 

 The double tubercles on the middle segments are closer together and more distinct 

 than in the two preceding specimens. The IIBrt are interiorly united basally. The 

 ventrolateral processes on the arm bases have a small carination. The 27 arms are 

 80 mm. long, slender and smooth. P! is 5.5 mm. long with 18 segments. P 2 is 7 mm. 

 long with 16 segments. P 3 is about 5 mm. long with 15 segments. There is no 

 carination of the bases of the proximal pinnules. 



In the specimen form Fiji, according to Gislen, the centrodorsal is 6 mm. in diame- 

 ter with the excavated dorsal pole 2 mm. in diameter. The cirri are about XXX, 

 39-45, about 25 mm. long, with a transverse crest that develops into two very indis- 

 tinct dorsal tubercles on about the thirtieth segment. The two tubercles are closely 

 set and coalesce into a single small, well-circumscribed dorsal tubercle on the outer 

 segments. The arms are very much broken, but were more than 20 in the complete 

 specimen; detached arms are 100-120 mm. long. Ventrolateral carination is present 

 on the proximal ossicles. PI is 7-8 mm. long with 15-18 segments. P 2 is 9-10.5 mm. 

 long with 15-18 segments. P 3 is 4-5.5 mm. long with 14 segments. There is no 

 carination of the basal portion of the proximal pinnules. 



Professor Gisleu said that the large specimens (that is, all but the third from the 

 Marshall Islands) differ from all the other species of Cenometra except C. abbotti in 

 having 40^15 cirrus segments. However, he said, in the species mentioned there are 



