NATURAL HISTORY BULLETIN. 



tentacle-scales are two to a pore. The outer one is flat and 

 ovate; the inner one is slender, spiniform, acute; both de- 

 crease rapidly in size and the inner one disappears at different 

 joints on the several arms, from the fifth to the twelfth, while 

 the other becomes lanceolate and acute. 



Diameter of disk. 10 mm. The arms are all broken. 



When living, according to Professor Nutting, the disk was 

 liffht brown with five broad radial bands of white. This 

 color still remains in alcohol. There are also traces of a 

 median white line on the arms. 



Off Havana, no to 200 fathoms. Off St, Kitts, 208 fath- 

 oms, Blake Exp. 



Ophiopristis {Ofihiotreta) sertata (Z,ym.) 



Ophiacantha sertata Lyman, Bull. Mus. Comp. Zool., I, 10, p. 326, 

 1869; Bull. Mus. Comp. Zool., V, 9, p. 231; op. cit. X, p. 261; Re- 

 port Voy. Challenger, Zool., Ophiuroidea, V, p. 198, 1882. 



Our example differs in some respects from Mr. Lyman's 

 description, but it agrees with specimens received from him. 

 The species has not been figured. 



The mouth-papillae are usually six, not counting the pair of 

 tooth-papillae at the tip of the jaw; they form a close row; 

 the two outer ones are broader and larger than the others, 

 rather flat, ovate, obtuse, (not truncated as described by Ly- 

 man) ; they stand just below the outer oral tentacle. About 

 four, placed more proximally, are more slender, elongated, 

 compressed or spiniform. Tooth-papillae usually three; close 

 together on the edge of the jaw-tip, two are stouter than the 

 mouth-papillae, conical, acute; they appear to arise from the 

 apex of the dental plate; just above these and below the first 

 tooth, there is usually and odd median one, of similar form, 

 but shorter, so that it is not visible from beneath. 



Oral shield is usually wider and more lozenge-shaped than 

 described, but in some of the smaller specimens it agrees 

 fairly with the description, though by "heart-shaped" Lyman 

 evidently did not mean "'cordate" in the usual sense, for there 



