OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 217 



The Challenger discovered O. capillaris in 12° N. latitude and 122° 

 E. longitude at a depth of 182 to 210 meters (100 to 115 fathoms) ; 

 she found it again at Cebu in 182 meters (100 fathoms). The Siboga 

 found the species in the Sunda Archipelago in about 5° S. latitude 

 and 132° E. longitude at a depth of 304 to 310 meters (166 to 169 

 fathoms) . 



OPHIOTHRIX CORONATA Koehler. 



Plate 40, fig. 5 ; plate 41, figs. 1-4 ; plate 98, fig. 1. 



Ophiothrix coronata K<ehler ('05), p. 91, pi. 9, figs. 8, 9. — H. L. Clark 

 ('15), p. 280. 



Locality. — Albatross station 5108; China Sea, off southern Luzon; 

 Corregidor Light bearing N. 39° E., 41.70 kilometers (22.5 miles) 

 distant (lat. 14° 05' 05" N., long. 120° 19' 45" E.) ; 24 meters (13 

 fathoms) ; January 15, 1908; Co. 



One specimen. 



No locality. 



One specimen (Cat. No. E. 8, U.S.N.M.). 



Notes. — The diameter of the disk in the specimen from station 5108 

 is 7 mm. ; the arms are broken off at a greater or lesser distance from 

 the base, and the largest is preserved for almost 50 mm. of its length. 

 The specimen shows a bluish-gray coloration, with narrow reddish 

 annulations at intervals on the dorsal surface of the arms, which is 

 covered with small very closely crowded spinulate club spines. 



The specimen without locality was associated with the Ophiothrix 

 which I have described above under the name of O. bellax; it is 

 larger than that from station 5108, the diameter of its disk reaching 

 14 mm., and the arms exceeding 110 mm. in length. The general 

 coloration is a rather dark pink on the dorsal surface of the disk 

 and arms ; the ventral surface is lighter. 



The characters of these two specimens agree well with those of the 

 Siboga specimen which served me as the type of O. coronata, and I 

 believe it necessary to refer them to this species rather than to O. 

 demessa. The arm spines are very long, their length exceeding three 

 segments; the under arm plates are markedly longer than broad. I 

 have not thought it necessary to separate these two specimens in spite 

 of the difference in coloration, for their morphological characters 

 are absolutely identical. They are very different in size, and the 

 smaller, while showing a general blue color, has reddish tints which 

 recall the general coloration of the larger. 



The type specimen of O. coronata was found by the Siboga in the 

 Sunda Archipelago (lat. 0° N., long. 130° E.) at a depth of 83 meters 

 (47 fathoms). 



The microscopical characters of the club spines which cover the 

 disk, of the arm spines, etc., are identical in the two specimens; they 



