148 HIROSHl OHRHIMA 



23. Ruimstroin, J. (l'J12). — " Quelqucs observations sur la variation et 

 la correlation chcz la larve de I'Oursin ", ' Bull. Inst. Oc6an, 

 Monaco ', no. 247. 



24. (1914). — " Analytischc Studien iiber die Seeigclentwicklung. 



I. Mitt.", ' Arch. Entw.-Mech.', Bd. 40, Heft 4. 



25. (1917).— Ditto. III. Mitt., ibid., Bd. 43, Heft 3. 



26. (1918).— Ditto. IV. Mitt., ibid., Heft 4. 



27. (1917-18). — " Zur Entwicklungsniechanik der Larve von Par- 

 echinus mi liar is", ' Bergens Mus. Aarb.', Nr. 14. 



28. (1920). — " Entvi^icklungsmechanische Studien an Henricia 



sanguinolenta Forbes und Solas ter spec", 'Arch. Entw.- 

 Mech.', Bd. 46, Heft 2-3. 



29. Spemaini, H., und H. Falkenberg (1919). — " Uber asymnietrischc 



Entwicklung und Situs inversus visccrum bei Zwillingen und 

 Doppelbildungen ", ' Arch. Entw.-Mech.', Bd. 45, Heft 3. 



30. Ubisch, L. v. (1913). — "Die Entwicklung von Strongyloccn- 



trotus lividus (Echinus microtuberculatus, Arbacia 

 pustulosa) ", ' Zs. wiss. Zool.', Bd. 106, Heft 3. 



11. Appendix. 



To tliu I'Xiimples of the reversed larvae (p. 112) a case in 

 the startisli Cribrella ociilata as figured and described by 

 A. T. Masterman is to be added (see ' Trans. Eoy. Soc. Edin- 

 burgh ', vol. 40, 1902). My thanks are due to Professor 

 J. F. Gemmill, who has kindly called my attention to this 

 paper. Compare also : Gemmill, " Notes on the Develop- 

 ment of the Starfishes Asterias glacialis 0. F. M. ; 

 Cribrella ocu lata (Linck) Forbes; Solasterendeca 

 (Eetzius) Forbes; Stichaster roseus (0. F. M.) 

 Sars ", ' London Proc. Zool. Soc.', 1916, p. 557. 



With regard to the reversed larvae of Ophionotus 

 hexactis a description can now be found in the following 

 work : Th. Mortensen, ' Studies on the Development and 

 Larval Forms of Echinoderms ', Copenhagen, 1921 (p. 182). 



H. 0. 



Princeton, N. J. 

 December 28, 1921. 



