PART 5 



A MONOGRAPH OF THE EXISTING CRINOIDS 



529 



FIGURE 28. Psathyromttra graciUima A. H. Clark, paratype, U.S.N.M., 35637: a, Lateral view; 



4 and c, detached parts of cirri. 



The 10 arms which, except for their greater slender-ness, 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 1.8 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 six 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 are all broken at the first syzygy but a piece of one to the second syzygy 

 remains attached. The length from the proximal edge of the IBri to the second syzygy 

 is 11.0 mm. and the width of the first syzygy is 1.5 mm. 



The proximal pinnules are all broken but appear to have been very long with 

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

 the basal segment is not longer than wide. 



Locality. Investigator station 6; southwest of Akyab, Arrakan coast, Burma (lat. 

 1935' N., long. 9224' E.); 497 meters; temperature 10.0 C.; December 8, 1887 

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



