356 ARTHUR WILLEY. 



20. KowALEVSKY, A. — " Entwickelung8geschicht,e der einfachen Ascidien," 



' Mem. Acad. Imp. des Sciences de St. Petersbourg,' 7th series, x, 

 No. 15, 1866. 



21. KowALEVSKY, A. — " Weitere Studien, &c.," ' Arcli. f. mikr, Anat.,' vii, 



1871, pp. 101-130. 



22. KowALEVSKY, A.— " Einige Beitrage zur Bildnng des Mantels der 



Ascidien," 'Mem. Acad. Imp. des Sciences de St. Petersbourg,' 7th 

 series, xxxviii, No. 10, 1892. Includes a detailed account of the 

 processes involved in the absorption of the tail of the larva at time 

 of fixation. 



23. Krohn, a. — " Ueber die Entwickelung der Ascidien," ' Miiller's Archiv 



f. Anat. u. Phys.,' 1852, pp. 312—333. 



24. KuPFFER, C. — " Die Stammverwandtschaft zwischen Ascidien und 



Wirbelthiere," * Arch. f. mikr. Anat.,' vi, 1870, pp. 115—172. 



25. Lang, A. — " Zum Verstandniss der Organisation von Cephalodiscus 



dodecalophus, M'Int.," 'Jenaische Zeitschr. f. Naturwiss.,' xxv. 

 Heft 1, 1890. 



26. Langerhans, P. — " Zur Anatomic der Appendicularien," ' Monatsber. 



d. konigl. Akad. der Wissensch. zu Berlin,' 1877, pp. 561—566. 



27. Lankester, E. R.— " The Vertebration of the Tail of Appendicularise," 



• Quart. Journ. Micr. Sci.,' xxii, 1882, pp. 387—390. 



28. Lankester, E. R., and Willey, A.—" The Development of the Atrial 



Chamber of Amphioxus," ib., xxxi, 1890, pp. 445 — 466. 



29. Morgan, T. H. — " The Growth and Metamorphosis of Tornaria," ' Journ, 



Morph.,' V, 1891, pp. 407—450. 



30. MiJLLER, W. — " Ueber die Hypobranchialrinne der Tunikaten und deren 



Vorhandensein bei Amphioxus und den Cyklostomen," ' Jenaische 

 Zeitschr. f. Nat.,' vii, 1873, pp. 327—332. 



31. Seeliger, 0. — " Die Entwickel. der socialen Ascidien," ib., xviii, 1885. 



32. Willey, A. — "On the Development of the Atrial Chamber of Am- 



phioxus," ' Proc. Roy. Soc.,' xlviii, 1890, pp. 80—89. 



33. Willey, A. — "Later Larval Development of Amphioxus," 'Quart. 



Journ. Micr. Sci.," xxxii, 1891, pp. 183—234. 



34. Willey, A. — " Observations on the Post-embryonic Development of 



Ciona intestinalis and Clavelina lepadiformis," 'Proc. 

 Roy. Soc.,' li, 1892, pp. 513—520. 



