292 University of California Publications in Zoology [Vol. 18 



Michael, E. L., and McEwen, G. F. 



1915. Hydrographic, plankton, and dredging records of the Scripps Insti- 



tution for Biological Kesearch of the University of California, 

 1901-1912. Ihid., 15, 1-206, 4 figs, and 1 map in text. 



1916. Continuation of hydrographic, plankton, and dredging records of the 



Scripps Institution for Biological Research of the University of 

 California, 1913-1915. Ibid., 15, 207-254, 7 figs, in text. 

 Murray, J., and Hjort, J. 



1912. The depths of the ocean, a general account of the modern science of 

 oceanography based largely on the scientific researches of the 

 Norwegian steamer "Michael Sars" in the North Atlantic. (Lon- 

 don, MacMillan), 821 pp. 575 figs, in text. 



Bitter, W. E. 



1905. The pelagic Tunicata of the San Diego region, excepting the Larvacea. 

 Univ. Calif. Publ. Zool., 2, 51-112, pis. 2-3, 31 figs, in text. 



SCHURIG, W. 



1910. Hydrobiologisches und Plankton-Praktikum. (Leipzig, Quelle), 160 



pp., 6 pis., 215 figs, in text. 

 Seeliger, O. 



1886. Die Knospung der Salpen. Jena. Zeitsehr. Naturw., 19, 573-677, 



10 pis. 

 Shull, a. F. 



1911. Studies in the life cycle of Hydatina senta. II. The role of tempera- 



ture, of the chemical composition of the medium, and of internal 

 factors upon the ratio of parthenogenetic to sexual forms. Jour. 

 Exper. Zool., 10, 117-165. 

 Steuer, a. 



1910. Planktonkunde. (Leipzig, Teubner), 723 pp., 365 figs, in text. 

 Whitney, D. D. 



1907. Determination of sex in Hydatina senta. Jour. Exper. Zool., 5, 1-26. 



