CLARK: JAPANESE AND EAST INDIAN ECHINODEEMS. 291 



stellata Lyman, 1878. Bull. Mus. Conip. Zool., 5, p. 125. Pacific Ocean, off 



New Zealand, 700-1100 fathoms, 

 tessellata Lyman, 1878. Bull. Mus. Comp. Zool., 5, p. 223. Atlantic Ocean, 



off West Indies, 242 fathoms. 

 clypeata Lyman, 1883. Bull. Mus. Comp. Zool., 10, p. 234. Atlantic Ocean, 



off West Indies, 151-232 fathoms, 

 marmorea Lyman, 1SS3. Bull. Mus. Comp. Zool. 10, p. 233. Atlantic Ocean, 



off West Indies, 114-250 fathoms, 

 bispinosa Koehler, 1897. Ann. Sci. Nat., (8) 4, p. 319. Indian Ocean, off An- 

 daman Islands, 112 fathoms, 

 alba Liitken & Mortensen, 1899. Mem. Mus. Comp. Zool., 23, p. 102. Pacific 



Ocean, off Cocos and Galapagos Islands, 770-1360 fathoms, 

 contigua Liitken & Mortensen, 1899. Mem. Mus. Comp. Zool, 23, p. 101. 



Pacific Ocean, off Galapagos Islands, 1322-1360 fathoms, 

 inermis Bell, 1902. Rep. Nat. Hist. "Southern Cross," p. 217. Antarctic 



Ocean, off Cape Adare, South Victoria Land, 26 fathoms, 

 casta Koehler, 1904. Oph. Exp. " Siboga," pt. 1, p. 22. Arafura Sea, 312 



fathoms, 

 molesta Koehler, 1904. Oph. Exp. "Siboga," pt. 1, p. 23. Sulu Sea, 705 



fathoms ; Atlantic Ocean, near Canary Islands, 1175 fathoms, 

 capensis Bell, 1905. Mar. Inv. South Africa, 3, p. 256. Indian Ocean, off Cape 



Colony, 25-900 fathoms, 

 projecta Koehler, 1905. Oph. Exp. "Siboga," pt. 2, p. 19. Banda Sea, etc., 



among Dutch East Indies, 8-63 fathoms, 

 sincera Koehler, 1906. Mem. Soc. Zool. Erance, 19, p. 12. Atlantic Ocean, 



off Spain, 679-889 fathoms, 

 longispiua Clark, supra. 



Key to the species of Ophiozona. 



Tentacle pores not restricted to base of arm ; tentacle scales present at least at 

 base of arm. 

 Tentacle scales present on all tentacle pores. 

 Tentacle scales 2 

 Arm-spines 2. 



Arm-spines short, equal ; radial shields small, separate or touching molesta. 

 Arm-spines as long as side arm-plates, upper longer; radial shields large, 



separate bispinosa. 



Arm-spines 3-5. 



Surface of disc smooth. 



Disk high but flat, margin raised above arms, with a short spine or 



knob at outer end of each radial shield tessellata. 



Disc-margin raised little, or not at all, above arms ; no spine or knob 

 at outer ends of radial shields. 

 Oral shields very small, little or not at all larger than one of the 

 swollen adoral plates ; arms short, 3-4 times diameter of disc 



marmorea. 



