NO. 1820 RECENT CRIXOIDS TROM PHILIPPINES — CLARK 215 



HIMEROMETRA MILBERTI (J. Muller) 



Station No. 5100; oil Corregidor Island (entrance to Manila 

 Bay) ; 35 fathoms. 



HIMEROMETRA DISCOIDEA, new species 



Centro-dorsal large, hemispherical or somewhat columnar, with a 

 large convex polar area ; cirrus sockets marginal, in two crowded 

 alternating rows. 



Cirri xvii, 37-45 (usualh- about 40). 30 mm. long; the cirri de- 

 crease ver}' gradually in diameter for the first eight or ten joints, 

 then remain uniform; first cirrus joint short, about twice as broad 

 as long, or rather shorter, the following gradually increasing in 

 length, becoming squarish after about the twelfth or sixteenth, and 

 becoming about one-third broader than long in the terminal portion ; 

 from about the eighteenth onward prominent, though small, dorsal 

 spines are developed, subterminal in position, becoming terminal in 

 the last two or three joints ; opposing spine small, median in position, 

 not rising to more than one-third the diameter of the penultimate 

 joint; terminal claw somewhat longer than the penultimate joint, 

 moderately curved. 



Radials projecting slightly beyond the centro-dorsal, their dorsal 

 surface parallel to the dorso-ventral axis of the animal; first costals 

 short, oblong, about three times as broad as long; costal axillaries 

 rhombic, about twice as broad as long, rising to a low conical tubercle 

 with the first costals. Ten arms about 130 mm. long; first brachial 

 wedge-shaped, about twice and one-half as broad as its exterior 

 length, almost entirely united interiorly ; second brachial irregularly 

 quadrate, rather larger than the first ; third and fourth brachials 

 (syzygial pair) oblong, twice and one-half as broad as long; follow- 

 ing brachials to the tenth slightly wedge-shaped, about three times 

 as broad as long ; the following brachials become more obliquely 

 wedge-shaped, somewhat over twice as broad as their greatest 

 length, then gradually become shorter and less and less obliquely 

 wedge-shaped and very short and discoidal after about the proximal 

 third of the arm. 



First pinnule small and comparatively slender, 7 mm. long, with 

 fifteen joints, all somewhat longer than broad, the first two and the 

 terminal three or four being not quite so long as the others ; second 

 pinnule 11 mm. long, with seventeen joints, stouter than the first; 

 first two joints squarish, the remainder slightly longer than broad; 



