Verrill, JSfotes on liadiata. 257 



edges nearly straight, resembling those of 0. elegans* Plates of the 

 disk large, very regularly arranged, precisely like those of 0. elegans. 

 The central one is nearly circular, surrounded by a rosette of five an- 

 gular ones with convex inner margins. From the central group a row 

 of the large plates radiate to each interradial margin; to the base of 

 each arm radiates another row of these plates, of which the two outer- 

 most are smaller and separate the large, oval radial shields, which 

 are jwinted inwardly ; between each radial shield and the base of 

 the arm there is also a large angular plate. All the plates of 

 the disk are bordered by a row of very small plates. Arm-spines five 

 at the base of the arms, four farther out, short, tapering, the middle 

 ones longest. Tentacle-scales two, short, broad, the inner one largest. 



Color, in alcohol, very variable above ; in the specimen above de- 

 scribed, dark greenish, with a large central blotch of reddish white 

 surrounded by a narrow line of dark brown ; each outer interradial 

 plate is of the same color, with a similar dark border. The other 

 plates, both large and small, are speckled with very dark brown. 

 The upper side of the arms are alternately lighter and darker grayish 

 green, with frequent blotches of reddish white. The lower surface is 

 uniformly white or pale flesh-color. Other specimens have the greater 

 part of the upper side of the disk light grayish green, with blotches 

 of dark brownish green, and a central patch of reddish, which appears 

 to be the constant color of the outer interradial plate. The arms also 

 are at times mostly reddish with irregular patches of green, or they 

 may be very regularly banded with reddish and dark olive-green. 



A small specimen with arms '78 of an inch long, and ■25 in diameter 

 of disk, has but three arm-spines at the base of the arms and two far- 

 ther out. Another, somewhat larger, has four spines at base and 

 three along most of the length of the arms. 



Some of the specimens from La Union are "9 of an inch in diame- 

 ter of disk; arms 3*25 long; and have six arm-spines at the base of 

 the arms, of which the uppermost ones are longest. 



OphioZOna Paciflca Lyman, op. cit., p. 67. 



Ojjhiolepis pac'ifica Liitken, Vidensk. Medd., 1856; Additam. hist. Oph., p. 104. 



A few specimens of this species have been received from Panama 

 and the Pearl Islands, collected by Mr. Bradley. Dr. Lutken's speci- 

 mens were from Puntarenas in four fathoms. 



Our largest specimen has arms 2 inches long, and a disk -45 in di- 

 ameter. It was generically separated from the last species on account 

 of the absence of supplementary side pieces to the upper arm-plates. 

 The disk is covered by numerous convex, naked plates, bordered by 



* See (Catalogue Mus. Comp. Zool., PI. II, fig. 5. 



