A MONOGRAPH OF THE EXISTING CRINOIDS 



59 



Ml the segments from the transition segment onward bear prominent dorsal spines 

 which on the 3 or 4 terminal become very small. The opposing spine is low, less than 

 one-fourth the width of the penultimate segment in height, and rounded. Ihe ter- 

 minal claw is longer than the penultimate segment, stout, and moderately curved. 



The disk is naked, except for a few scattered granules near the periphery. Ihe 

 brachial ambulacra are naked. The pinnule ambulacra have moderately developed 

 side and covering plates. The sacculi are small. 



The ends of the basal rays are visible as irregular tubercles in the mterradial angles 



° f t The rTdials are concealed by the centrodorsal. The IBr, are almost entirely con- 

 cealed but their apposed sides are visible as triangles in the interrad.al angles. The 

 IBr 2 are rhombic, about twice as broad as long, produced posteriorly oyer the IBr„ 

 with the borders slightly prominent and a moderately sharp median keel The lllJr 

 series are 2 with the axillary rhombic and over twice as long as the preceding ossicle; 

 both are bluntly carinate in the median line, and their borders are slightly prominent. 

 The division series are sharply flattened laterally and are in close lateral apposition. 

 The first 15 brachials are also sharply flattened laterally. 



The 20 rather slender arms are 130 mm. in length. The first 2 brachials are wedge- 

 shaped the latter larger than the former and with a rounded posterior projection. 1 he 

 following 11 brachials are oblong or slightly wedge-shaped, about twice as broad as 

 long, those succeeding gradually becoming somewhat more obliquely W edge-shaped 

 aW as long as broad, and slowly less obliquely wedge-shaped distally and elongate 

 terminally. After about the proximal third of the arm the brachials develop promi- 

 nently overlapping distal edges which are armed with fine spines. The arms are strongly 

 compressed laterally in the basal third, and moderately "^P^*^, „ 2 , „, 

 Syzygies occur between brachials 3+4, agam between brachials 23+24 and 32 + 33 

 and distally at intervals of from 4 to 9 muscular articulations, the intersyzygial interval 

 decreasing distally. ^ ^ Pf ^ ^ espcciaUy eirlarged, 



tapering evenly from the base to the tip. It is composed of 15 segments all of which 

 are about as long as broad, P 2 is 5 mm. long with 13 segments of which the first is about 

 a long as broad and those following become progressively elongated, reaching a eng h 

 of 2 or 3 times the width distally. The following pinnules gradually decrease in length 

 to P a or P 7> then become rather more slender and increase to 7 mm distally 



The color in alcohol is brownish yellow, the calyx and arm bases to the fourth 

 brachial dark brow, the cirri light yellowish P , llinn|1 i hot ween 



Locality. -Albatross station 3S82; Hawaiian Islands; Padolo Channel ^ between 

 Maui and Molokai; Mokuhooniki Islet bearing N. 30° W 3 1 L mdes distant; ^^ 

 sand, coral, and rock: bottom temperature 17.5° C; Apnl 16, 1902 [A. H. Clark, 1908, 

 1QDQ 1Q19 1918 1949; Gislen, 1934] 1, U.S.N.M., 22689). 



^-This species wa's described under the name of Tlutlassometra crasser, 



in 1908 from a single specimen from Albatross station 3882; at the same tune another 



sm dl 10 armed specimen from station 4107 was recorded which is regarded herein as the 



y^speclZ SsHremetra decora (see page 134). In 1909 ****** "»££« 



to the new genus Cosmiometra. It has not been rediscovered since it was originally 



described. 



