216 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Albatross station 5538; between Negros and Siquijor; Apo Island 

 (C.) bearing S. 64° W., 13.53 kilometers (7.3 miles) distant (lat. 

 9° 08' 15" N., long. 123° 23' 20" E.) ; 468 meters (256 fathoms) ; 

 August 19, 1909; gn. M., S. 



Some specimens. 



Albatross station 5543; Tagolo Light bearing S. 75° W., 23.16 

 kilometers (12.5 miles) distant (lat. 8° 47' 15" N., long. 123° 35' 

 00" E.) ; 296 meters (162 fathoms) ; August 20, 1909. 



Three specimens (Cat. No. E. 113 [part], U.S.N.M.). 



Albatross station 5560; Jolo Island and vicinity; Cabalian Point 

 bearing N. 76° W., 9.26 kilometers (5 miles) distant (lat. 5° 52' 00" 

 N., long. 121° 01' 06" E.) ; 26 meters (14 fathoms) ; September 18, 

 1909. 



One specimen. 



Albatross station 5573; north of Tawi Tawi; Simaluc Island (N.) 

 bearing S. 86° E., 0.74 kilometer (0.4 mile) distant (lat. 5° 28' 30" 

 N., long. 120° 13' 00" E.) ; 22 meters (12 fathoms) ; September 22, 

 1909. 



One specimen (Cat. No. E. 104 [part], U.S.N.M.) 



Albatross station 5576; north of Tawi Tawi; Mount Dromedario 

 bearing S. 22° W., 31.87 kilometers (17.2 miles) distant (lat. 5° 25' 

 56" N., long. 120° 03' 39" E.) ; 507 meters (277 fathoms) ; Septem- 

 ber 22, 1909* S. 



One specimen (Cat. No. E. 113 [part], U.S.N.M.) 



Notes. — The specimens are in general very fine and in an excellent 

 state of preservation. The diameter of the disk varies between 13 

 mm. and 24 mm. The coloration is always very light and varies 

 from a pinkish gray to a clear pink on the dorsal face of the disk 

 and of the arms ; the ventral surface is very pale and almost white. 

 The line which runs along the middle of the dorsal surface of the 

 arms is broad, brownish red, sometimes perfectly uniform and some- 

 times lighter in the middle. Some specimens show a general rather 

 dark brown coloration. I give here (pi. 37, fig. 3) a figure of a 

 specimen from station 5440 in which the radial shields show a cover- 

 ing of rather closely crowded club spines, and another from station 

 5536 (fig. 2) in which, conversely, the club spines are rare and very 

 small on the radial shields the surface of which is almost naked and 

 which are relatively larger. Isolated and examined under the 

 microscope these club spines show variations of importance only in 

 their dimensions (pi. 97, fig. 5a), some remaining very short, others 

 becoming rather long and relatively rather slender; they usually 

 have three or four terminal spinules. At some distance from the 

 disk the first ventral arm spine is transformed into a hook with three 

 branches of the form most usual in the genus Ophiothrix (fig. 55). 

 The tentacle scale is large and rounded (c) . 



