MONOGRAPH OF THE EXISTING CRINOIDS. 



285 



spines (as in Ci/llometra or Decametra), or into paired dorsal spines (as in Cenometra 

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

 give way to the usual single spine. 



33EGC 



FIG. 336. 



FIG. 337. 



FIG. 338. 



FIG. 339. 

 FIGS. 336-339. 336, LATERAL VIEW OF A CIRRUS FROM A SPECIMEN OF AMPUIMETRA DISCOIDEA FROM QUEENSLAND. 337, A 



CIRKUS FROM A SPECIMEN OF AMPHIMETRA ENSIFER FROM SINGAPORE MEWED (a) DORSALLY AND (6) LATERALLY. 33S. LAT- 

 ERAL VIEW OF A CIRRUS FROM A SPECIMEN OF HlMEROMETRA MARTENSI FROM SINGAPORE. 339, LATERAL VIEW OF A CIRRU3 

 FROM A SPECIMEN OF HlMEROMETRA PERSICA FROM THE PERSIAN GOLF. 



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

 Stephanometridse (fig. 340, p. 287) and Charitometridsc (fig. 369, p. 299), the 

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



