OPHIURANS OF THE PHILIPPINE AND ADJACENT WATERS. 91 



which appears also in many other genera and which of itself does not 

 suffice to justify this reunion. 



OPHIOTOMA ASSIMILIS Koehler. 



Plate 20, figs. 1-7. 



OpMotoma assimtiis KCEHLER ('04), p. 144, pi. 28, figs. 1, 2. H. L. CLABK 

 ('15), p. 218. 



Localities. Albatross station 5450; east coast of Luzon, San 

 Bernardino Strait to San Miguel Bay; East Point (Batan Island) 

 bearing S. 36 E., 17.05 kilometers (9.2 miles) distant (lat. 13 

 23' 15" N., long. 124 00' 30" E.) ; 746 meters (408 fathoms) ; 

 June 3, 1919 ; gn. M., Co. 



Three specimens (Cat. No. E. 105, U.S.N.M.). 



Albatross station 5460; east coast of Luzon, San Bernardino Strait 

 to San Miguel Bay; Sialat Point Light bearing N. 24 E., 15.20 

 kilometers (8.2 miles) distant (lat. 13 32' 30" N., long. 123 58' 06" 

 E.) ; 1,033 meters (565 fathoms) ; June 10, 1909; gy. M. 



Three specimens (Cat. No. E. 108, U.S.N.M.). 



Albatross station 5505; Northern Mindanao and vicinity; Maca- 

 balan Point Light (Mindanao) bearing S. 31 E., 14.27 kilometers 

 (7.7 miles) distant (lat. 8 37' 15" N., long. 124 36' 00" E.) ; 402 

 meters (220 fathoms) ; August 5, 1909. 



One specimen (Cat. No. E. 107, U.S.N.M.). 



Albatross station 5647; Buton Strait; North Island (S.) bearing 

 S. 87 E., 21.50 kilometers (11.6 miles) distant (lat. 5 34' 00" S., 

 long. 122 18' 15" E.) ; 949 meters (519 fathoms) ; December 16, 

 1909 ; gn. M. 



Three specimens (Cat. No. E. 106, U.S.N.M.). 



Notes. Only two of the specimens from station 5450 are in good 

 condition; they are of large size, the diameter of the disk being from 

 20 mm. to 22 mm. and the length of the arms 75 mm. In figures 4 

 and 5, plate 20, I show the two surfaces of one of these specimens. 

 All the others are in rather bad condition ; the dorsal surface of the 

 disk is torn away almost completely and the arms are usually in- 

 complete excepting in the individuals from station 5647, in which the 

 disk is at least 25 mm. in diameter and the arms from 70 mm. to 80 

 mm. long. Those from station 5460 are smaller, the diameter of their 

 disks varying between 12 mm. and 15 mm., and the arms being from 

 54 mm. to 60 mm. long. That from station 5505 is still smaller. In 

 spite of a few discrepancies which these specimens show when com- 

 pared with the description which I gave in 1904 of O. assimilis, 

 based upon individuals collected by the Siboga in the Sunda Islands, 

 to which I shall return later, I feel certain that they all belong to the 

 same species. As the specimens collected by the Siboga were more or 



