OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 389 



the name of 0. paciftcum) from many localities between 45°-51° N. 

 latitude and 124°-130° W. longitude, as well as between 34°-45° 

 N. latitude and 137°-139° E. longitude, at depths of 916 to 1,602 

 meters (501 to 876 fathoms). 



The specimens of O. hastatum from the Challenger collection 

 which served Lyman as the type of the species came from the North 

 Atlantic in 37° N. latitude and 25° W. longitude, and therefore 

 from localities very close to those where the Princesse- Alice redis- 

 covered it, from the southern part of the Indian Ocean (46° S. 

 latitude and 45° E. longitude), and from the Pacific Ocean (40° S. 

 latitude and 177° E. longitude). Ophiocten hastatum therefore has 

 a very extensive geographical and bathymetric distribution. 



OPH10MUSIUM ALTUM Koehlcr. 



Plate 80, figs. 6, 7, 12. 



Ophiomusium altum Kcehleb ('04), p. 57, pi. 10, figs. 2-4. — H. L. Clark 

 ('15), p. 333. 



Locality. — Albatross station 5668; Macassar Strait; Mamuju 

 Island (E.) bearing S. 31° E., 19.64 kilometers (10.6 miles) distant 

 (lat. 2° 28' 15" S., long. 118° 49' 00" E.) ; 1,648 meters (901 

 fathoms) ; December 29, 1909; gy. M. 



One specimen (Cat. No. 40921, U.S.N.M.). 



Notes. — The specimen is almost of the same size as that upon which 

 I established the species, and the diameter of the disk barely reaches 

 5 mm.; the arms are preserved for a greater or lesser part of their 

 length, and one of them, which is complete, measures 15 mm. ; they 

 are very slender. 



I find in this specimen all the essential characters of O. altum, and 

 I notice only slight differences in the outlines of some of the dorsal 

 plates of the disk. The primary rosette is a little irregular, one of 

 the five radials being replaced by two plates. The two small inter- 

 radial plates which separate these primary radials are triangular, 

 sometimes in contact by their apices, sometimes slightly separated 

 from each other; the two radial shields of each pair are in contact 

 for at least three-quarters of their length and the plate which sepa- 

 rates them inwardly, instead of being elongated, is triangular and 

 scarcely longer than broad. I can distinguish a few small papillae 

 along the very short genital slits. 



The type of Ophiomusium altum was discovered by the Siboga in 

 4° S. latitude and 118° E. longitude (Straits of Macassar) at a 

 depth of 2,029 meters (1,110 fathoms). 



OPHIOMUSIUM ARMATUM, new species. 



Plate 89, figs. 8-10. 



Locality. — Albatross station 5428; eastern Palawan and vicinity; 

 30th of June Island bearing N. 62° W., 36.14 kilometers (19.5 miles) 



