R. Rathhun — List of the Brazilian Echlnoderms. 157 



successive syzygia. In tlie characters of the cirri and the centro- 

 clorsal piece there are no appreciable differences. 



The specimens from Bahia and Pernambuco, on the contrary, 

 differ mostly with regard to the centro-dorsal piece and the cirri. 

 The former is nsually proportionately broader and flatter, but is 

 extremely variable. The cirri are, as a rule, proportionally longer 

 and fewer in number ; they are placed in about two irregular rows 

 or in one crowded row, and range in number from about fifteen to 

 thirty, on mediuiii-sized specimens. They are composed of from 

 nineteen to twenty-two joints each. The total spread of the largest 

 perfect specimen observed was a little over twenty-five centimeters. 

 The color varies from a light yellowish brown to a deep violet, with 

 many intermediate shades, specimens being usually banded with 

 lighter and darker coloi-ings, and seldom of uniform tint. 



The study of a large series of specimens would probably serve to 

 unite the Brazilian with the East African species beyond all doubt. 



Antedon meridionalis (A. Ag.) Verriii. 



Proc. Bost. Soc. Nat. Hist., vol. x, p. 339, 1866; Pourtales, Bull. Mus. Comp. ZooL, 

 i, Xo. 11, p. 355, 1869 ; Ibid., v, No. 9, p. 214, 1878. 



Charleston, S. Carolina, to Cape Frio, Brazil (Pourtales, Mus. 

 Comp. Zool.) 



Antedon Diibenii Boische. 



Archiv. fiir Naturgeschiclite, 1866, p. 92. 

 Rio de Janeiro (Boische). 



Antedon, sp. 



A small species of Antedon, having between ten and twenty arms, 

 was collected by Mr. Branner, in great abundance at some locality 

 not definitely recorded, either on the^ coast of Pernambuco, or of 

 Parahyba do Norte. I have not been able to identify it with any 

 described species that has come under my notice, although it may 

 not be new. 



It is rather a delicate species, with slender arms and cirri, the 

 former at times presenting only one division of the second order 

 resulting in the formation of eleven arms. There may, however, be 

 any number of arms, up to at least twenty. It has a total spread of 

 only about 9'''", the centro-dorsal piece, measuring 2'"'" in diameter, 

 being flat and destitute of cirri on top, but sometimes still preserving 



