A MONOGRAPH OF THE EXISTING CRINOIDS 165 



from half again to twice as long as the median breadth, and the distal segments are 

 shorter. The antepenultimate is not very much longer than broad. The fourth- 

 seventh and following segments are strongly constricted centrally, the fourteenth- 

 eighteenth becoming less swollen at the ends. The opposing spine equals in height 

 one-third the width of the segment. The terminal claw is somewhat longer than the 

 penultimate segment. The radials are almost entirely concealed; the visible distal 

 border is adorned with small tubercles. The elements of the IBr series have a weak 

 median prominence. The arm bases are smooth, without the longitudinal promi- 

 nences seen in E. variegatus. There is a prominence between the second and third 

 brachials, formed in the oblique articulation on the right. There is a similar promi- 

 nence on the left between the fourth and fifth brachials, and one on the right between 

 the fifth and sixth brachials; the prominences then become less pronounced. There 

 are small ventrolateral rows of tubercles as far as the fourth brachial. The width 

 of the first brachial is 1.9 mm. Syzygies occur between brachials 3+4 and 8 + 9. 



P c is 4 mm. long with 10 segments. P l is also 4 mm. long with 10 segments. P, 

 is 7.5 mm. long with 10 segments. P 2 is8mm. long with 11 segments. These pinnules 

 are extraordinarily stout and tliick and are sharply triangular. The third segment 

 of P! and P» is about as long as broad. The distal segments are three-quarters again 

 as long as broad, without distal spiny borders. P b and P 3 are much more slender, the 

 latter having 17 segments and reaching 8 mm. in length; the segments are from two 

 and one-half to three times as long as broad. The disk has been thrown off, but it 

 was probably about 3 mm. in diameter. The color, as preserved, is yellow-brown. 



Dr. Gislen said that this specimen is closest to Eudiocrinus indivisus, although 

 the longest cirrus segments are rather short for this species. But it has cirri con- 

 siderably longer than those described for E. indivisus, and in this respect approaches 

 the form described as E. granulatus by Bell. 



Professor Bell said that his new species E. granulatus is altogether much stouter 

 than E. indivisus with longer and stronger cirri, much stronger pinnules, and a granular 

 covering to the segments. It has an arm length of 120 mm., and the cirri are about 

 12 mm. long. Bell said that the arrangement and number of the cirri are as described 

 for E. indivisus, but in E. granulatus the first two pinnules have more massive seg- 

 ments than the third and fourth and are quite as long, the second, indeed, being longer 

 than the third. The other striking difference is the granulation of the surface of the 

 arms. The ambulacral surface of the pinnules is a purplish brown, the rest of the 

 animal being yellowish white. 



Bell wrote that from the descriptions of Semper and of P. H. Carpenter, bearing in 

 mind that they had only one specimen and he had only one, he was inclined to regard 

 the Macclesfield Bank specimen as belonging to Semper's species. But when he put 

 the two specimens side by side it was easy to see that the two could not be united. 



In Bell's figure the cirrus shown has 20 (+1) segments of which the longest are 

 about twice as long as broad and the distal are about as long as broad or slightly broader 

 than long. In the figure of an arm base the lowest pinnule shown, which is apparently 

 P a , is about 6 mm. long and is composed of 16 or 17 segments; P b is 10 mm. long, with 

 26 segments; P c is about 8 mm. long, with 16 segments; and P„ is 7.5 mm. long. Bell 

 figured the seventh pinnule as 8 mm. long with 17 segments, and "one of the most 

 distal pinnules" as about 9 mm. long with 14 (+1) segments of which all but the basal 



