rÓ2 



The firn are XVIII, ; : mm to [.o mm. long; the longest cirrus segment 



usually the sixth is trom two and one half to three times as long as broad; the following 

 slowly decrease in length, in the middle of the cirri being about as long as broad, or slightly 

 broader than long, and in the terminal fourth or fifth twice as broad as long; the longer 

 proximal segments have a slight median constriction and slightly produced distal edges; the 

 short distal segments have a prominent median keel which, instcad of being sharp along the 

 crest, is broadly rounded. This keel begins as a production of the distal dorsal border of the 

 segment, but soon involves tin- entire dorsal surface becoming, in profile view, rounded triangular, 

 the apex near the distal end, then evenly rounded, and in the terminal portion more or less 

 straight along the crest. 



The ends of the basal rays and the radials are concealed, the IBr, abutting directly 

 upon the centrodorsal though nowhere touching it, being separated from it by narrow sub- 

 radial clefts. 



The 1 1 > r . are very narrow and band-like, trom six to eisfht times as broad as longT: 



verywhere of the same width, luit while the outer surface of their lateral portions 



is parallel to the axis of the IBr series, their median portion is recumbent. making an angle 



of nearly 90 with that axis, so that in direct lateral view they are only about one third as 



high in the median line as laterally. 



The axillaries are rhombic, with produced and broadly truncated lateral angles, half 

 again as long as broad; the lateral edges are about as long as those of the IBr,; the 

 distal anti proximal sides are strongly concave; a posterior process, about as high as the 

 anterior angle but somewhat broader and more rounded, incises the IBr r The proximal 

 two thirds of the median portion of the axillaries rises into a prominent, but well rounded, 

 median elevation. 



The ossicles of the IBr series are very sharply flattened against their neighbors, this 

 flattening persisting as far as the base of 1',. 



The first brachial is short, deeply incised by the second ; the outer length is much 

 greater than the inner, and more than twice the median, the distal border being strongly 

 concave The second brachial is irregularly quadrate, with a strong posterior process incising 

 the first; the proximal three fourths of the median line is elevated, as in the axillary. The 

 third brachial is oblong, very short, about five times as broad as long. All of the arms are 

 this point. 



I', is 5.5 mm. long, compósed of [9 segments of which the first eight are much larger, 

 but proportionately shorter, than those succeeding; the second-seventh have thin very high 

 carinate pn> vhich reach a maximum on die fourth thence rapidly decreasing in heighth 



distally; after the eighth segments the pinnule is relatively slender, and tapers gradually to 

 the ti|>. In lateral view the pinnule appears enormously swollen in the proximal three fifths 

 Mirst eight segments), the swelling reaching a maximum on the fourth segment and decreasing 

 rapidly distally; bevond the eighth segment the pinnule is slender and evenly tapering, 

 compósed of segments most of which are about as long as broad, with numerous spinules along 

 prismatic ridgi 



