OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 417 

 OPHIOMUSIUM SCALARE Lyman. 



Plate 89, fig. 7 ; plate 90, figs. 1, 2. 

 Ophiomusium scalare Lyman ('78), p. 117, pi. 1, figs. 1-3; ('82), p. 95, pi. 1, 

 figs. 4-6— Kcehler ('96), p. 308, pi. 6, figs. 24, 25; ('99), p. 26, pi. 2, figs. 

 12, 13; pi. 3, fig. 21.— H. L. Clark ('15), p. 334.— Matsumoto ('17), p. 

 285, fig. 77. 



Locality. — Albatross station 5135; vicinity of Jolo; Jolo Light 

 bearing S. 46° W. 9 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. 



One specimen (Cat. No. 40941, U.S.N.M.). 



Notes. — The diameter of the disk is 9 mm. 



I have had occasion at different times ('96, p. 308; '99, p. 26; and 

 '04, p. 65) to describe the variations shown by O. scalare. The 

 Albatross specimen recalls the one which the Siboga collected at 

 station 280. The radial shields are triangular, and the two plates 

 of each pair are in contact outwardly, or very close to each other; 

 the arm spines are three in number. I give photographs of the 

 dorsal and ventral surfaces of the disk, as well as a side view of the 

 arm, of this specimen. 



Ophiomusium scalare was discovered by the Challenger in 28° S. 

 latitude and 177° W. longitude, 1,097 meters (600 fathoms) ; it was 

 rediscovered by the Investigator in the Andaman Islands, in 204 

 meters (112 fathoms), and by the Siboga in two localities in the 

 Sunda Islands (8° and 10° S. latitude, l23° and 127° E. longitude 

 [520 and 1,224 meters; 285 and 672 fathoms]). Matsumoto has 

 just recorded it from Japan (Ukishima, 549 meters [300 fathoms]). 



OPHIOMUSIUM SIMPLEX Lyman. 



Plate 88, figs. 10, 11. 



Ophiomusium simplex Lyman ('78), p. 115, pi. 1, figs. 10, 11; ('82), p. 93, 



pi. 1, figs. 7-9.— H. L. Clabk ('11), p. 109; ('15), p. 333. 

 Ophiomusium sanctum Kcehleb ('04) p. 59, pi. 11, figs. 7-9. 



Localities. — Albatross station 5356; north Balabac Strait; Balabac 

 Light bearing S. 64° W., 28.72 kilometers (15.5 miles) distant (lat. 

 8° 06' 40" N., long. 117° 18' 45" E.) ; 106 meters (58 fathoms) ; 

 January 5, 1909 ; S., Sh. 



Five specimens (Cat. No. 40985, U.S.N.M.). 



Albatross station 5357; north Balabac Strait; Balabac Light bear- 

 ing S. 65° W., 26 kilometers (14.3 miles) distant (lat. 8° 06' 00" N., 

 long. 117° 17' 10" E.) ; 124 meters (68 fathoms) : January 5, 1909; 

 Co., S. 



Seven specimens (Cat. Nos. 40987, 40988, U.S.N.M.). 



Albatross station 5433; eastern Palawan and vicinity; Corandagos 

 Island (NW.) bearing N. 30° E., 12.05 kilometers (6.5 miles) dis- 



55269— 22— Bull. 100 27 



