20 NATURAL HISTORY BULLETIN. 



in the mottling of the arms, they agree with the ordinary 

 varieties of the species. 



A young one, with similar disk-spinules, has the disk deep 

 red-brown with the arms deep pink, and mottled above with 

 whitish, in the usual manner. Those from Station 39 are 

 pale pink with yellowish white disk; the dorsal white arm- 

 stripe is distally bordered with red. the disk bears minute, 

 elongated, thorny spinules, mixed with a few long, very slend- 

 er, thorny spines, but the radial shields are naked, triangu- 

 lar, with their outer ends in contact, narrow, upturned, and 

 prominent even in young specimens only 4 to 5 mm. in diam- 

 eter. 



Sta. 13, off Havana, in 200 fathoms, two examples; Sta. 39, 

 20 fathoms, off Key West; Sta. 68, 69, 74, off Little Cat I., 3 

 to 13 fathoms, three examples; Egg Key, two examples; Bahia 

 Honda, nineteen examples; Tortugas, one example. A com- 

 mon species, from Cape Hatteras and Bermuda to Bahia 

 Brazil, and throughout the West Indies, in shallow water. 

 Colon (coll. Bradley). Fernando de Noronha (Chall. Exp.) 

 Rio de Janeiro (Liitken). 



The most northern locality recorded is N. Lat. 35 , 21 ', in 

 i6fathoms(U. S. Fish Com). 



It frequently occurs in the interstices of coarse sponges. 



Ophiothrix cerstedii Liitken. 



Ophiothrix orstedii Liitken, Vid. Meddel., p. 15, 1856; Lutken, Add. 

 ad Hist. Oph., Pt. II, p. 149, pi. IV, fig-. 3, 1859. Lyman, 111. Cat. 

 Mus. Comp. Zool., I, p. 154; Bull. Mus. Comp. Zool., V, 9, p. 233. 

 Verrill, Trans. Conn. Acad., I, p. -342, 1868. Lyman, Report Voy. 

 Challenger, Zool., Ophiuroidea, V, p. 226, 1882. Nutting, Narrative, 

 Bahama, Exp., pp. 132, 211. 



Those from Egg Key are mostly dark brown or dark gray, 

 in alcohol, but all have the arms transversely banded with 

 narrow blackish lines, narrowly bordered on each side by 

 white lines. These triple bands alternate with the rows of 

 spines. Narrow radial lines of the same colors extend inward 

 on the disk, along the radial shields. The lower side of the 



