MONOGRAPH OF THE EXISTING CRINOIDS. 



285 



spines (as in CyUometra ov Decametra), or into paired dorsal spines (as in Cenometra 

 or Colobometra) ; at the tip of the cirrus, however, these various structures finally 

 give way to the usual single spine. 



Fig. 336. 



■ IH-l-H-l-l-l-|.|-MoUlo|.|.M.|.|. I II I I I I II I 77 



Fig. 337. 



uxxxsxmy 



Fig. 338. 



Fig. 339. 

 Figs. 336-339.-336, Lateral view of a cirrus from a specimen of Amphimetra discoioea from Qdeenslani>. 337, A 



ORRUS FROM A SPECIMEN OF AMPHIMETRA ENSIFER FROM SINGAPORE \TEWED (a) DORSALLY AND (6) LATERALLY. 33S. LAT- 

 ERAL VIEW OF A CTRRUS FROM A SPECIMEN OF HlMEROMETRA MARTENSI FROM SINGAPORE. 339, LATERAL \TEW OF A ORRDS 

 FROM A SPECIMEN OF HlMEROMETRA PERSICA FROM THE PERSUN GULF. 



In a number of species, chiefly in the families Mariametrida; (fig. 344, p. 287), 

 Stephanometridas (fig. 340, p. 287) and Charitometridaj (fig. 369, p. 299), the 

 cirrals in the outer portion of the cirri gradually become strongly carinate dorsally 



