192 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



OPHIACTIS PROFUNDI Ltttken and Mortensen. 



Plate 63, fig. 8. 



Ophiactis profundi LTTTKEN and MORTENSEN ('99), p. 140, pi. 6, figs. 



4-6. KCEHLER ('09), p. 173. 

 Ophiactis pteropoma H. L. CLARK ('11), p. 134, fig. 50; ('15), p. 264.- MAT- 



SUMOTO ('17), p. 154. 



Localities. Albatross station 5325 ; off northern Luzon ; Hermanos 

 Island (N.) bearing N. 86 E., 31.04 kilometers (16.75 miles) dis- 

 tant (lat. 18 34' 15" N., long. 121 51" 15" E.) ; 410 meters (224 

 fathoms) ; November 12, 1908 ; gn. M. 



One specimen (Cat. No. 41314, U.S.N.M.). 



Albatross station 5522; northern Mindanao and vicinity; Point 

 Tagolo Light bearing S. 39 W., 11.1 kilometers (6 miles) distant 

 (lat. 8 49' 00" N., 123 26' 30" E.) ; 421 meters (230 fathoms) ; 

 August 10, 1909 ; Glob. 



Two specimens (Cat. No. 41312, U.S.N.M..). 



Albatross station 5605; Gulf of Tomini, Celebes; Dodepo Island 

 (W.) bearing N. 14 W., 10.93 kilometers (5.9 miles) distant (lat. 

 21' 33" N., long. 121 34' 10" E.) ; 1,183 meters (647 fathoms) ; 

 November 16, 1909. 



One specimen (Cat. No. 41313, U.S.N.M.). 



Notes. All the specimens are of small size ; in the two from station 

 5522 the diameter of the disk varies between 3 mm. and 4 mm., and 

 the others are slightly smaller. All have six arms; the individuals 

 from stations 5522 and 5605 possess three large arms and three others 

 very small which are in process of regeneration, and their disks are 

 also regenerating. In the specimen from station 5325 all the arms are 

 broken off near the base and the disk is circular and does not seem to 

 be undergoing regeneration. 



Although all my specimens are of small size, I do not believe that 

 there can be any doubt regarding their identification. 



Furthermore, I do not hesitate to unite with 0. profundi, O. ptero- 

 poma which H. L. Clark has recently established from specimens 

 from Japan and which also possesses six arms. Apart from a slight 

 difference in length of the arm spines, there is a remarkable con- 

 cordance in the descriptions and figures published by H. L. Clark, 

 and those previously published by Lutken and Mortensen. In par- 

 ticular H. L. Clark has again found the peculiar character of the 

 upper arm plates, which are separated from each other by a small 

 interval not occupied by the side arm plates. The only difference 

 which I can find between 0. profundi Liitken and Mortensen and 

 0. pteropoma H. L. Clark, from a comparison of the descriptions and 

 figures of the authors, is that in the latter the dorsal arm spine is 



