OPHIUROIDEA OF THE BAHAMA EXPEDITION. 57 



flat, lanceolate, the outer one largest. The first under arm- 

 plate is small and bears a small process at each inner corner. 



Color, in alcohol, yellowish white, with yellowish brown 

 bars across the arms; disk with small dark brown spots. 



Diameter of disk, 6 mm; arms badly broken. 



Sta, 13, off Havana, 200 fathoms, one example. 



Amphipsila fulva [Lyman). 



Ophiopsila fulva Lyman, Bull. Mus. Comp. Zool., Vol. V, p. 227, pi. 

 II, flgs. 25-27, I878; op. cit. Vol. X, p. 254, 1883. 



This species was described and figured by Mr. Lyman 

 from a single specimen. 



The figure lacks many details and does not agree well with 

 the description, but both differ so decidedly from our speci- 

 men of O. maculata that it seems useless to unite them. A 

 direct comparison of specimens, however, might possibly 

 show that they are varieties of one species. 



West Indies, 13 to 175 fathoms, Blake Exped. 



Ophiomitra Lyman. 



Bull. Mus. Comp. Zool., Vol. I, p. 325, 1869; Voyage Challenger, V, 

 pp. 202, 209, 1882, pi. XL,V, figs. 4-6, (anatomy). 



This genus is very closely allied to Ofhiacantha. The only 

 special distinctions given by Lyman are the larger size and 

 nakedness of the radial shields, and the naked or nearly 

 naked scales of the disk. 



Mr. Lyman also described the disk of the type-species as 

 rounded and cap-like — a character due, perhaps, to imma- 

 turity, for in large specimens of that species the interradial 

 margins are incurved or emarginate. 



When adult, the type-species ( O. valida Lym.)* has num- 

 erous spiniform, clustered mouth-papillae and tooth-papillae. 



*The specimens originally described and figured by Lyman were all 

 immature, and had not developed the true characters of the mouth- 

 parts. 



