CLARK: BRITTLE-STARS. 307 



This is a northern representative of the preceding species and it is 

 quite possible that the two are not distinct. It ranges northward 

 from Panama to the Gulf of California but it has been taken at only 

 a very few places and is very imperfectly known. 



Ophiactis modesta. 



Brock, 1888. Zeitschr. f. wiss. zool., 47, p. 482. Doderlein, 1896. Jena, 

 denkschr., 8, pi. 15, fig. 5-56. 



This species is known only from Amboina, and Thursday Island, 

 Torres Strait. 



Ophiactis affinis. 



Duncan, 1879. Journ. Linn. soc. Zool., 14, p. 469, pi. 10, fig. 23, pi. 11, fig. 

 24. 



Little is known of this species, the type-locality of which is " Korean 



Seas." 



Ophiactis cyanosticta, sp. nov, 

 Kvavos = dark blue + (ttikto^ = marked, in reference to the coloration. 



Plate 4, fig. 3, 4. 



Holotype. — M. C. Z. 4,149, and numerous Paratypes, M. C. Z. 

 4,150, 4,194. British West Indies: Tobago, Buccoo Bay, April, 1916, 

 in coralline Algae and among coral fragments. Carnegie Expedition. 

 H. L. Clark coll. 



Disk, 3 mm. in diameter; arms six, 10 mm. long. Disk covered by 

 a coat of moderately coarse scales among which the primaries are 

 visible but not conspicuous ; there are about five series of scales in the 

 interradial areas at the narrowest point ; the interbrachial areas below 

 are covered by much smaller scales, some of which bear low-spinelets; 

 a number of the spinelets are visible from above, occurring along the 

 margin of the interradial area. Radial shields about equal to one 

 half radius of disk and fully twice as long as wide; distally they are 

 in contact but proximally they are well-separated. Upper arm-plates 

 fully twice as wide as long, distal as well as proximal margins perfectly 

 straight but proximal much shorter; lateral margins rounded; great- 

 est width of plate near distal margin. Oral shields pentagonal or 



