A MONOGRAPH OF THE EXISTING CRINOIDS 327 



distal edges straight and parallel; it is united to the second by syzygy. The second 

 brachial (epizygal of the first syzygial pair) is low, wedge-shaped, and runs almost to a 

 point interiorly. It is about three times as broad as the greater (outer) length. The 

 third and fourth brachials form an approximately oblong sj^zygial pair wliich is about 

 three times as broad as long. The fifth brachial is appro.ximately oblong, slightly 

 longer and broader than the syzygial pair preceding. The sixth brachial is of about 

 the same size as the fifth, but is distinctly wedge-shaped. The following brachials 

 have more and more oblique edges and after the tenth are triangular, somewhat more 

 than twice as broad as long, with the distal edges at right angles to the longitudinal 

 axis of the arm on the side away from the pinnule, but on the pinnule side running 

 outward and forward at an angle of about 30° with the longitudinal a.xis to a point 

 distal to the pinnule base. In the terminal portion of the arms the brachials increase 

 shghtly in length, becoming short wedge-shaped. 



Syzygies occur between brachials 1 + 2, 3 + 4, from 11 + 12 to 14+15, and distally 

 at intervals of from 4 to 11, most commonly 5 or 6, muscular articulations. 



Pi and Pa are very long and may reach 25 mm. in length. They are composed of 

 about 60 segments, all of which are much broader than long. The segments in the 

 distal half bear teeth. P2 and Pb are shorter with fewer and smaller segments, but 

 also bear a comb. P3 and Pc are much smaller and shorter than P2 and Pb with much 

 shorter segments, all of wliich are much broader than long. The segments are much 

 produced dorsally, so that the dorsal profile is strongly and roundedly serrate. The 

 succeeding pinnules increase in length and stoutness. The component segments are 

 much broader than long and those beyond the second are sharply keeled and more or 

 less produced dorsally. In the extreme terminal portion of the arms the pinnules 

 become slender and are composed of about 20 segments, which beyond the second are 

 longer than broad. The second and third segments of P2 and P,, usually possess a 

 more or less strongly produced carinate process, which makes them appear much 

 larger and broader than the segments succeeding. On P3 and P^ and the pinnules 

 following all of the segments bear more or less similar carinate processes, so that 

 usually the second and third are not distinguished. 



The disk is from 15 to 25 mm. in diameter. It is usually more or less extensively 

 beset with plates and nodules, and is often completely covered with thin scalelike 

 plates which on and in the immediate vicinitj' of the anal tube bear fairh" regular 

 globular nodules. The mouth is radial. 



Notes. — In Miiller's redescription of Lamarck's Comatula Solaris based on an 

 examination made for him by Troschel he gave the cirri as XX, 30. The radials 

 are concealed. The 10 arms are about 160 mm. long. The intersyzygial interval 

 is 4 or 5 muscular articulations. The epizygals of the syzygial pairs are extraor- 

 dinarily short. The pinnules decrease only slightly in length from the oral outward, 

 all of them bemg long. The pinnules are stout, 4-angled (that is, sharply carinate), 

 and because of the production of the segments have a serrate profile. 



Carpenter said that the number of cirrus segments as given, 30, is evidently 

 a misprint for 20. But I can not believe that this is explained so easily. The 

 number of cirrus segments, plus the fact that the pinnules are described as decreas- 

 ing in length only slightly from the calyx outward, suggest that Troschol's notes 



