THE ECHINODERMS OF PORTO RICO. 
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7. Ophiozona impressa (Lutken. ) 
From Florida to St. Thomas and Jamaica, usually in shallow water along shore, under or among 
stones or coral. It reaches a diameter of 15 mm., the arms 4 to 5 times as long. Vaiiegated dark 
brown and white above, pale yellowish brown beneath; arms regularly banded. Five specimens, all 
from Ponce. 
8. Ophiozona nivea compta Verrill. 
This species occurs throughout the West Indies in water of from 50 to 400 fathoms. It reaches a 
diameter of 16 mm., the arms 2 or 3 times as long. The color is whitish. In typical nivea the radial 
shields are not separated. 
One specimen from station 6050. 
9. Ophiozona tessellata Lyman. 
This easily recognized species is found throughout the West Indies, but only in deep water, 60 to 
300 fathoms. It is smaller than the jrreceding, but similar to it in color. 
There is a single Ophiozona from station 6067, which is evidently this species. 
10. Ophiothyreus goesii Ljungman. 
This curious little ophiuran (under 10 mm. in diameter) is plain grayish-white in color. It has 
been taken at various stations in the West Indies, but only in water of over 80 fathoms depth. 
One small specimen from station 6067. 
11. Ophioglypha ljungmani Lyman. 
Previously taken only off the coast of Brazil, where it was found on muddy bottom in 350 fathoms. 
The color is gray. The disk reaches a diameter of 8.5 mm.; the arms about 5 times as long. The 
Porto Rican specimens were taken on the north and west sides of the island on a bottom of sand and 
mud in 20 to 45 fathoms. 
There are 5 specimens of an Ophioglypha from stations 6051, 6062, and 6064, which are probably 
this species. They differ from Lyman’s description only in the shape of the under-arm plates and in 
the presence of but i oral papillae (3 on each side). They are certainly nearer to this species than to 
lepida, which was taken by the Challenger off the Bermudas and in other parts of the western Atlantic, 
and which belongs to the same section of the genus. The type of ljungmani was taken in 350 fathoms, 
9 degrees south of the equator, so that its presence in shallow water off Porto Rico is certainly note- 
worthy. The largest specimen before me has a disk 6.5 mm. in diameter and arms about 20 mm. long. 
The type of ljungmani had the disk 8.5 mm. in diameter and arms 45 mm. long. 
12. Ophioglypha robusta Ayres. 
This northern species is quite small, rarely 10 mm. in diameter; the arms about 4 times as long. 
The color iii alcohol is grayish white but the living animal is said to be gray, reddish, or violet, with 
the arms barred. In the north it occurs from low-water mark to 18 fathoms, but the specimens from 
Porto Rico were all dredged in water nearly 100 fathoms deep. 
A species of Ophioglypha was taken at stations 6050 and 6067, 1 specimen at the former and 14 at 
the latter. They seem to belong to this northern species, though differing slightly in the shape of the 
under-arm plates and radial shields. But all the specimens are small (3 to 5 mm. in diameter) and 
they vary more or less among themselves. It is possible they are the young of 0. acerrater, a common 
West Indian species, of which no specimens were taken. 
13. Ophiomusium eburneum elegans Verrill. 
This species occurs on rocky bottoms in 75 to 500 fathoms, from Cuba to Porto Rico and south- 
ward. Color, whitish. It reaches a diameter of 12 mm. ; the arms about 4 times as long. 
There are 12 specimens of Ophiomusium eburneum, 11 from station 6070 and 1 from 6063, in the 
Fish Hawk collection, all belonging to the variety described by Verrill from “off Havana.” They vary 
in size from 5 to 10 mm. in diameter. 
