THE ENTBEOPNEUSTA. 55 



List of Papers Referred to. 



1. Agassiz, Alex. — " Hist, of Balanoglossus and Tornaria," 'Mem. Amer. 



Acad.,' vol. ix. 



2. Balfoub, F. M. — 'Monograph on Elasmobranch Pishes,' 1878. 



3. Bateson. W.— "Early Stages in De?. of Balanoglossus," 'Quart. Journ. 



Mier. Sci.,' April, 1884. (' Studies from the Morphological Labora- 

 tory,' vol. ii, part i.) 



4. Hatschek, B.— " Stud. ub. Entw. d. Amphioxus," Claus's 'Arbeiten, 



Wien, 1881. 



5. Hatschek, B.— " Mitth. iib. Amphioxus," ' Zool. Anz.,' Sept. 29tli, 1884. 



6. KowALEVSKY, A. — " Anatomie des Balanoglossus," 'Mem. Acad. Imp. 



Sci.,' St. Petersburg, 1866. 



7. Lankester, E. Ray. — " New Points in Structure of Amphioxus," 



' Quart. Journ. Micr. Sci.,' xv, p. 257. 



8. Metschnikoff, E. — "Ueb. d. Metam. einiger Seethiere," ' Z. f. W. Z.,' 



20, 1870. 



9. Metschnikoff, E. — "Ueb. d. Syst. Stell. v. Balanoglossus," 'Zool- 



Anz.,' 1881. 



10. Scott, W. B. — "Beitrage z. Entw. d. Petromyzonten," 'Morph. Jahrb.,' 



Bd. vii. 



11. Spengel, J. W. — " Bau. u. Entw. v. Balanoglossus," ' Tag. d. Naturf. 



Ver.,' Miinchen, 1877. 



12. Spengel, J. W.— " Z. Anat. d. Balanoglossus," 'Mitth. a. d. Zool. Sta. 



z. Neapel.,' Bd. v, Hft. 3 and 4. 



