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OPHIOLEPIS CINCTA. 



same species ; they present no structural variation, except that some- 

 times there are three instead of two large scales, in a straight line, 

 between the radial shields ; the largest specimens have the disk to the 

 arms, as 21 : 58. The supplementary arm-plate pieces are sometimes 

 cut in two. Drawings belonging to Professor Agassiz show that the 

 living animals (from Charleston) vary in color ; in one, the upper sur- 

 face of the disk is Vandyke brown, the central primary plate being 

 light yellow, and the other primary plates surrounded by specks of 

 white or of brown ; the upper arm-plates are like the disk, and bear 

 specks of white ; the side arm-plates yellow ; in another, there is a 

 large, oblong, light-yellow spot in the middle of the disk, and a smaller 

 round spot in each interbrachial space, all these being limited by black 

 dots ; the rest of the disk is mottled with brownish and greenish gray, 

 and some black dots ; the side arm-plates are light yellow, and the 

 upper arm-plates lighter or darker greenish-gray, making bands. Occa- 

 sionally one or two of the lower teeth are split in two. 



This species is distinguished by its regular back plates, and numerous 

 arm-spines. 



LIST OF SPECIMENS. 



OpMolepis Cincta Mull. & Trosch. 



Ophiokpk cincta Mull. & Trosch. System der Asteriden, p. 90. 

 Ophiolepis cincta Lutken. Addit. ad Hist. Oph. 



LIST OF SPECIMENS. 



