242 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



closer than I had supposed, as is shown by the study of certain speci- 

 mens of 0. stelligera such as those which I have shown on plate 4 

 as figure 4, in which the very large radial shields are only slightly 

 covered. But the two species may always be distinguished by the 

 club spines of the dorsal surface of the disk, which are terminated 

 by a few short and unequal spinules in O. infirma, by the somewhat 

 smaller arm spines, and especially by the tentacle scale, which is 

 remarkably large. I shall return again to the characters of O. 

 stelUgera when I discuss that species. 



OPHIOTHRIX KOREANA Duncan. 



Plate 45, figs. 1-6 ; plate 99, fig. 4. 



Ophiothrix koreana Duncan (79), p. 473, pi. 11, figs. 28-32. — Lyman ('82) t 

 p. 226.— Marktanner ('87), p. 308.— H. L. Clark ('11), p. 257, figs. 127, 

 128; ('15), p. 273.— Matsumoto ('17), p. 220. 



Localities. — Albatross station 5116; Balayan Bay and Verde Island 

 Passage; Sombrero Island bearing N. 69° E., 4.63 kilometers (2.5 

 miles) distant (lat, 13° 41' 00" N., long. 120° 47' 05" E.) ; 366 

 meters (200 fathoms) ; January 20, 1908. 



Four specimens (Cat. Nos. 41085, E. 86, U.S.N.M.). 



Albatross station 5135; vicinity of Jolo; Jolo Light bearing S. 46° 

 W., 22.05 kilometers (11.9 miles) distant (lat. 6° 11' 50" N., long. 

 121° 08' 20" E.) ; 294 meters (161 fathoms) ; February 7, 1908; fne. 

 co. S. 



Four specimens (Cat. No. 41082, U.S.N.M.). 



Albatross station 5179; vicinity of Romblon; Romblon Light bear- 

 ing S. 56° E., ,8.34 kilometers (4.5 miles) distant (lat. 12° 38' 15" N., 

 long. 122° 12' 30" E.) ; 68 meters (37 fathoms) ; March 25, 1908; 

 hrd. S. 



Three specimens (Cat. Nos. 41083, E. 92, U.S.N.M.). 



Albatross station 5187; Tanon Strait, east coast of Negros; Apo 

 Island bearing S. 21° W., 23.16 kilometers (12.5 miles) distant (lat. 

 9° 16' 45" N., long. 123° 00' 00" E.) ; 411 meters (225 fathoms) ; 

 March 31, 1908 ; sft. gn. M. 



Two specimens (Cat. Nos. E. 90, E. 91, U.S.N.M.). 



Albatross station 5212 ; east of Masbate Island ; Panalangan Point 

 bearing S. 54° 30' E., 26.87 kilometers (14.5 miles) distant (lat. 

 12°04' 15" N., long. 124° 04' 36" E.) ; 197 meters (108 fathoms) ; 

 April 20, 1908 ; gy. S., M. 



One specimen (Cat. No. E. 89, U.S.N.M.). 



Albatross station 5213; Destacado Island (S.) bearing N. 87° E.,. 

 15.75 kilometers (8.5 miles) distant (lat. 12° 15' 00" N., long. 123° 57' 

 30" E.) ; 146 meters (80 fathoms) ; April 20, 1908; S, M., Sh. 



One specimen (Cat. No. E 93, U.S.N.M.). 



