NO. 1820 RECENT CRINOIDS FROM PHILIPPINES — CLARK 233 



the specimens are, unfortunately, badly broken, and only one has 

 any cirri remaining. 



The genus Trichometra was previously known only from the 

 coast of the South Atlantic States (T. aspera) and from the 

 Hawaiian Islands (T. vexator) ; as the fauna of both the West 

 Indies (including the coasts of the Southern States) and the 

 Hawaiian Islands belongs to what I have called the "Oceanic" area, 

 the genera and species characterizing which are evidently derivatives 

 from Indo-Pacific — ^Japanese stock, and mostly occur in the Indo— 

 Pacific — Japanese region, though separated from the typical Indo- 

 Pacific — Japanese genera and species by a considerable difference 

 in depth of habitat, it was only to be expected that Trichometra 

 would eventually be found in the East Indies. Zenometra is another 

 such genus; though now known only from the West Indies (Z. 

 columnaris and Z. pyramidalis) and the Hawaiian Islands (Z. 

 triserialis) , it undoubtedly occurs in the East Indian region, and will 

 eventually be discovered there. 



Centro-dorsal conical, in lateral view an equilateral triangle, with 

 slightly convex sides ; cirri in number, arrangement, and proportions 

 of their joints resembling those of T. aspera; the cirrus joints num- 

 ber 25-28. 



Radials even with the edge of the centro-dorsal ; first costals short, 

 in lateral apposition, much incised in the median line ; costal axillaries 

 rhombic, nearly as long as broad ; costals and first two brachials in 

 lateral apposition and laterally flattened ; the synarthrial tubercles 

 are slightly marked. Ten arms ; first brachial about twice as broad 

 as long exteriorly, inwardly united at the base ; second brachial 

 much larger, irregularly quadrate ; first syzygial pair and following 

 brachials about as long as broad, wedge-shaped, after the tenth 

 becoming very obliquely wedge-shaped and considerably longer than 

 broad, the length gradually increasing distally. The costals and 

 lowei», brachials have abruptly everted, finely spinous distal edges, 

 but these are somewhat broader than those of T. aspera, and do not 

 stand out so high ; this eversion of the distal edge of the brachials 

 after the second syzygy gradually becomes more and more recum- 

 bent, taking the form of an overlapping of the distal ends of the 

 brachials, which gradually dies away, disappearing after about the 

 twentieth brachial. Syzygies occur between the third and fourth, 

 ninth and tenth, and fourteenth and fifteenth brachials, and distally 

 at intervals of two oblique muscular articulations. 



First pinnule 10 mm. long with 20 joints, resembling that of T. 

 aspera, bvit proportionately stouter ; second pinnule 7 mm. long with 

 16 joints, more slender than the first; the first three joints are 

 16 



