A MONOGRAPH OF THE EXISTING CRINOIDS 25 



P, is much enlarged, and is much larger than the pinnules succeeding. It is com- 

 posed of 12 segments of which the third is greatly broadened. From this it tapers to 

 the base, and also distally, the terminal five segments being exceedmgly small. 



Notes —The second specimen resembles that described, except that the spinosity 

 of the dorsal pole of the centrodorsal is much less developed; there are 32-34 cirrus 



segments^ ^^^ ^ evidently young) and the characteristic features of the 



species have not as yet become fully accentuated. 



Locality -Dr Th. Mortensen's Pacific expedition, 1914-1916; 7 miles south of 

 Olutanga Island, east of Zamboanga, Mindanao, Philippine Islands; about 548 meters; 

 hard bottom; March 3, 1914 (2, C. M.). 



DAIDALOMETRA ARACHNOIDES (A. H. Clark) 



Plate 3, Figure 12 



[See also vol. 1, pt. 1, fig- 205, p. 239; pt. 2, fig. 744, p. 349.] 



SUnornetra aracknoides A. H. Clark, Proc. U. S. Nat. Mus., vol. 36, 1909, p. 402 (description; 



Across f^j^^z^:fzrs^A^^ u 3. u* 13, »u, P . & 



^SrJS ITEU Zoo,. An,, vol. 39, No 11/1. »« £« Caption; S^a station 



294); Unstalked crinoids of the Siboga-Exped., 1918, p. 157 (identity^ 

 MflMr. ««*. A. H. Clark, Journ. Washington Acad. Sc. vo . 6 ^5 W16 p }« ( «g. 

 Daidalomelra arachnoides A. H. Clark, Unstalked cnnoids gtte >*&ffi&> ™* P " 



range; synonymy; notes; stations 166, 294), pp. 273, 275 (listed), pi. 23, fig. 60. 



Diagnostic features.-^ cirri are short, not more than half f^^gg^™* 

 49-65 segments; and the elements of the division series and ^ *° !?*^£ V ^ 

 narrow, sharp, and moderately high median carmation and abrupt y ^^ 

 coarsely spinous edges. The 10-18 (usually 10-13 and most commonly 10) arms 



60 ^^7-t^Z e ZiVZ^l ^ size, columnar, broader basally than 

 long, fSZSZ slightly in width distally. The bare polar area is 2 mm. m diameter. 



avera^ii as broad 2 long, rather prominently gapping *£*£*? 

 fifth segment is nearly half again as long as broad, a ^mor , or 1 » ™ 

 segment. The sixth is of about the same ength a a '^^^^^^ in length 

 segments are about as long as Wd ^^^t broad as long or even slightly 

 ^.Xlo^S 1 ^^^! following segments bear prominent dorsal 

 spines. ■, 



interradial angles of tbe calyx. 



843S03— 50 3 



