366 Verrill, N'otes on Radiata. 



Order, OPHIUROIDEA. 

 Ophiomyxa flaccida Lutk-en. 



Ophiura flaccid'i Say, Journal Phil. Acad., v, p. 151, 1825. 



Ophiomyxa fliccida Lyman, Illustrated Catalogue of the Museum of Comparative 

 Zoology, i, p. Its, PI. ii, fig. 6, 1865. 



One large specimen was obtained at the Abrolhos Reefs. It does 

 not appreciably differ from a specimen from the West Indies, sent 

 by Dr. Liitken, except in having slightly longer and sharper arm- 

 spines. 



It has been found previously at Florida, St. Thomas, and various 

 parts of the West Indies. 



Ophiactis Krebsii Lutken; Lyman, Catal., p. Ill, figs. 10, 11. 



Several fine specimens of this species occurred at the Abrolhos 

 Reefs, nearly all of them had six rays, with three of them usually 

 shorter. Two specimens differ slightly from the others in having more 

 slender arms, longer and more oval upper arm-plates, and radial 

 shields less separated. They have, however, four mouth-papillce, like 

 the typical form, and agree very well in color with the others. 



Its previous localities are Bahamas, — Dr. H. Bryant ; off Charleston, 

 — L. Agassiz ; Florida,— Maj. E. B. Hunt, J. E. Mills, etc. ; St. Thomas, 

 — A. H. Riise ; Aspinwall, — F. H. Bradley. 



Ophionereis reticulata Liitken ; Lyman, Catal., p. 141. 

 Ophiura reticulata Say, op. cit, p. 148, 1825. 



This species was found in considerable abundance by Mr. Hartt, at 

 the Abrolhos Reefs. 



Thei-e are specimens in the Museum of Yale College from Bermuda 

 (J. M. Jones) ; Bahamas (Dr. H. Bryant) ; Florida ; " West Indies ;" 

 and St. Thomas. The specimens from all these localities are remarka- 

 bly constant in their characters, and show scai'cely any local varia- 

 tions. 



Ophiothrix Violacea Milller and Troschel, Syst. Asterid., p. 115, 1842 : Lyman, 

 Catalogue, p. 164. 



This species occurred in abundance at the Abrolhos Reefs, among 

 corals and Gorgonite. 



In color there are two principal variations, most specimens have the 

 light dorsal stripe on the rays very clearly defined and bordered with 

 dark brown. Others have the stripe obscure, or lack it entirely. In 

 the character of the spines of the disk there are also two varieties, 

 not coincident, however, with the differences in color ; most commonly 



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