610 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
LITERATURE. 
Agassiz, L. 
1850. On the embryology of Ascidia, and the characteristics of new 
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Alder, J. 
1863. Observations on the British Tunicata, with descriptions of several 
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Alder, J., and Hancock, A. 
1907. The British Tunicata. (Vol. 1, London, 1905.) Vol. 2, xxviii + 
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Baird, S. F. 
1882. List of collections made by the fishing vessels of Gloucester and 
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Bancroft, F. W. 
1898. The anatomy of Chelyosoma productum Stimpson. Proc. Cali- 
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Bancroft, F. W., and Esterly, C. O. 
1903. A case of physiological polarization in the ascidian heart. Univ. 
of California Publications, Zool., vol. 1, p. 105-114. 
Binney, W. G. 
1870. MoUusca. In Gould's Report on the Invertebrata of Massa- 
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Bjerkan, P. 
1904. Tunicata. In Breitfuss, L. L., Exped. wissensch.-prakt. Unter- 
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1906. Ascidien von dem norwegischen Fischereidampfer " Michael Sars" 
in den Jahren 1900-1904 gesammelt. Bergens Mus. Aarbog, 1905, 
no. 5, 30 pp., 3 pis. 
1908a. Ascidien. In Report of the Second Norwegian Arctic Expedition 
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1908b. Die Ascidien des nordlichen Norwegens. Tromsoe Mus. Aars- 
hefter, no. 25, p. 49-118, pi. 1. 
Bonnevie, K. 
1896. Ascidiae simplices og Ascidiae compositae fra Nordhavs-Expedi- 
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16 pp., 2 pis. 
Broderip, W. J., and Sowerby, G. B. 
1830. Ob.servations on new or interesting MoUusca, contained, for the 
most part, in the Museum of the Zoological Society. Zool. Journal, 
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