THE RECENT CRINOIDS OF AUSTRALIA CLARK. 793 



the sides of that ossicle almost a right-angle, about as broad as 

 long, the distal angle considerably produced. 



Ten arms 60 mm. to 65 mm. long, rather stout in the basal 

 third but becoming exceedingly slender distal ly ; first brachial 

 short, almost oblong, two to two and one-half times as broad as 

 long in the median line, barely in contact basally interiorly, the 

 diverging interior edges making a very broadly obtuse angle ; 

 second brachial much larger, almost triangular, about as broad 

 as the greatest length ; third and fourth brachials (syzygial pair) 

 wedge-shaped, twice as long interiorly as exteriorly, about as 

 broad as the interior length ; following three brachials about 

 twice as broad as the median length, slightly wedge-shaped, then 

 becoming very obliquely wedge-shaped, almost triangular, about 

 as broad as long, further out on the arm less oblique, and in the 

 terminal portion much elongated and centrally constricted, twice 

 ag long as broad or even longer ; fifth and following brachials 

 with rather strongly overlapping spinous distal edges, this 

 character becoming less marked in the outer portion of the arm. 



Syzygies occur between the third and fourth brachials, again 

 between the ninth and tenth and fourteenth and fifteenth, and 

 distally at intervals of three oblique muscular articulations. 



Pj 11 mm. long, slender and flagellate, with thirty to thirty- 

 two segments ; first segment short, following three or four about 

 as long as broad, then rapidly becoming elongated and after three 

 or four more about twice as long as broad, somewhat longer dis- 

 tally ; second and two or three following segments with the distal 

 edges strongly produced, overlapping, and finely spinous, but this 

 gradually dies away as the segments become elongated so 

 that most of the pinnule is smooth ; the elongated segments 

 have slightly expanded ends ; Pg 5 mm. long, slightly less stout 

 basally than P^, with sixteen to twenty segments, the first 

 exceedingly short, the next two about as long as broad, the 

 following becoming elongated and about twice as long as broad 

 distally ; second, third and fourth with strongly overlapping 

 distal dorsal ends, this feature dying away on the three or four 

 following segments ; Pg about 5 mm, long resembling Pg with 

 about fifteen segments, of which the proximal have much more 

 strongly produced and overlapping distal ends, and this character 

 is prominent on all the segments almost to the tip of the pinnule ; 

 the third-twelfth segments bear a large rounded genital gland ; 

 following pinnules similar to Pg but slightly longer (5'5 mm.) 

 with somewhat larger genital glands ; after P^ „ the genital glands 

 slowly decrease in size and finally disappear on Pig J distal 

 pinnules exceedingly slender, about 4 mm. long, with large and 

 thickly set sacculi. 



The colour is a dull greenish grey. 



