A MONOGRAPH OF THE EXISTING CRINOIDS 



529 



Figure 28. — Psaihyrometra graciltima A. H. Clark, paratype, U.S.N. M., 35637: a, Lateral view; 

 b and c, detached parts of cirri. 



The 10 arms which, e.xcept for their greater slenderness, resemble those of the 

 related species, are about 100 mm. long. 



The color in life was a "pale earthy brown." 



[Notes by A.M.C] In a paratype in the U.S.N.M. the centrodorsal is l.S mm. in 

 vertical height and 3.3 mm. in basal diameter, with two rows each of 3 or 4 cirrus 

 sockets in each radius. All the cirri are broken by the eighth or ninth segment. 

 Their largest segments are si.x times as long as wide. A detached piece of 15 segments 

 lacking base and tip measures 21 mm. and a more terminal piece of 5 segments tapers 

 evenly. The 8 proximal segments of a peripheral cirrus measure 11.0 mm. 



The arms arc all broken at the fu-st syzygy but a piece of one to the second syzj'gy 

 remains attached. The length from the proximal edge of the IBri to the second syzj'gy 

 is 11.0 mm. and the width of the first sj-zj'gy is 1.5 mm. 



The proximal pinnules are all broken but appear to have been vcr\- long wnth 

 elongated segments slightly swollen and inconspicuously spinous at the joints. Only 

 the basal segment is not longer than wide. 



Locality. — Investigator station G; southwest of Akyab, Arrakan coast, Burma (lat. 

 19°35' N., long. 92°24' E.); 497 meters; temperature 10.0° C; December 8, 1887 

 [A. H. Clark, 1909, 1912] (3, U.S.N.M., 35637; I.M.). 



