Report on the Echinoderms of North-East Greenland. 277 



of the Si. Petersburg Museum, Professor Nassoiiow, asking him 

 to lend me the specimen for examination. He most Uberally granted 

 my request sending me one of the three original specimens preserved 

 in the Museum, informing me that the two other specimens were 

 exactly in the same condition, viz. nailed tests, without apical area. 

 I have carefully compared the (large) specimen sent with equal 

 sized specimens of drøbachiensis, the result being that I am unable 

 to distinguish it from that species. Though it would have been 

 very desirable to have examined also the pedicellariæ and spicules 

 of the type of chlorocentrotiis, I think it beyond doubt that it is 

 really a synonym only of drøbachiensis, as maintained by A. Agassiz. 

 That the specimen described by De Loriol (Op. cit.) under the 

 name Str. chlorocentrotiis is likewise only a local variation of the 

 very variable Str. drøbachiensis seems to me likewise beyond doubt. 



Holothurioidea. 



24. Myriotroclius Riiikii Stp. 



Mgriotrochiis Rinkii Steenstrup. 1851. En ny Form af de lunge- 

 løse og fodløse Søpølsers Gruppe. Vid. Medd. 

 Nat. Foren. København, p. 55. PI. 111. Figs. 7—10. 



— — Lutken. 1857. Grønlands Echinod. p. 22. 



— — Théel. 1877. Note sur quelques Holothuries des 



Mers de la Nouvelle Zemble. N. Act. R. Soc. 

 Upsal. Ser. m. p. 3. PI. I. 



— — Duncan & Sladen. 1881. Mem. Ech. Arctic 



Sea. p. 15. PI. 1. Figs. 20— 24. 



— — Danielssen Л Koren. 1882. Norske Nordh. 



Exped. Holothurioidea. p. 28. PL V. 



— — Levinsen. 1886. Kara-Havets Echinodermata. 



p. 387. 



— — Ludwig. 1900. Arktische und subarktische Holo- 



thurien. Fauna Arctica. p. 160. 



— — Östergren. 1902. The Holothurioidea of North- 



ern Norway. Bergens Mus. Årbog. p. 14. 



— — Mi ch a i lov ski j. 1903. Echinod. Russ. Exped. 



Spitzbergen, p. 12. 

 Several specimens, most of them badly preserved, from Stations: 

 16, 18, 43, 45, 46, 49, 70 and 72. 



One specimen from Stat. 70, and another (small) specimen from 

 Stat. 72 have only 11 tentacles, which appears to be a comparatively 

 rare variation. 



