i/5 



b a distal cirrus segments broader than long-, and bearing a high narrow 

 sharp keel the crest of which is parallel to the axes of the segments; 

 each of the elements of the division series bears a more or less developed 

 low rounded median tubercle (southern Japan;? dept h) . . . . septentrionalis 



i. Crossometra investigatoris (A. H. Clark). 



A. H. Clark. Proc. Biol. Soc. Washington, vol. 22, 1909, p. 82 {Pacliylometra investigatoris). 



Proc. U.S. National Museum, vol. 39, 1911, p. 556 {Pacliylometra liind). 



Crinoids of the Indian Ocean, 1912, p. 216, fig. 39, p. 217 {Pacliylometra investigatoris). 



Stat. 297. io°39'S., i23°4oE. Timor Sea. 520 Metres. 3 Ex. 



The largest specimen has 20 arms 110 mm. long; there are no IIIBr series; the cirri 

 are 30 mm. long with 22 — 23 segments; another has 21 arms; the third has 18 arms about 

 90 mm. long. 



2. Crossometra helius (A. H. Clark). 



A. H. Clark. Proc. Biol. Soc. Washington, vol. 25, 19 12, p. 78 {Pacliylometra helius). 

 Stat. 254. 5°4o' S., I32°26'E. 310 Metres. 5 Ex. 



The centrodorsal is of moderate size, fiattened hemispherical or thick truncated conical, 

 6 mm. in diameter at the base, 3 mm. across the flat dorsal pole and 4 mm. high; the cirrus 

 sockets are arranged in ten equally separated columns of two or three each. 



The cirri are about XXV, 23, about 28 mm. long; the first segment is short, the 

 following graduallv increasing in length to the fifth and sixth which are the longest. between 

 one third and one half again as long as broad ; the following segments very slowly decrease 

 in length so that those in the distal third of the cirri are about as long as the distal diameter; 

 in the distal third of the cirri the median portion of the distal dorsal edge of the segments 

 is somewhat swollen, this on the last five or six before the penultimate becoming a blunt 

 subterminal dorsal tubercle ; the opposing spine is prominent, short, sharp, terminal, directed 

 obliquely forward. 



The ends of the basal rays are visible as large rhombic tubercles in the angles of the 

 calyx ; the radials are entirely concealed; the IBi'j are very short, broadly V-shaped with the 

 proximal and distal edges parallel ; the lateral thirds of the proximal and distal edges are 

 slightly produced ; the axillaries are very short, nearly or quite three times as broad as long, 

 rhombic in shape with concave sides and truncated lateral angles, the lateral edges being as 

 long as those of the IBi^; the lateral edges and all but the median portion of the proximal edge 

 are very slightly produced ; the synarthrial tubercles are low and broad, scarcely evident. 



The contour of the proximal portion of the animal is broadly rounded, as in C. 

 septentrionalis. 



The 26 arms are 125 mm. long; there are seven IIBr 4(3 + 4) and three IIBr 2 series; 

 the IIIBr series are 2, internally developed except for one, which is situated by the side of an 

 internal IIIBr series. 



