9. Three New Helices from California, by S. Stillman Berry. Pp. 107-111. January, 1916 .05 10. On _Trypanosoma triatomae_, a New Flagellate from a Hemipteran Bug from the Nests of the Wood Rat _Neotoma fuscipes_, by Charles Atwood Kofoid and Irene McCulloch, Pp. 113-126, plates 14-15. February, 1916 .15 11. The Genera _Monocercomonas_ and _Polymastix_, by Olive Swezy. Pp. 127-138, plates 16-17. February, 1916 .10 12. Notes on the Spiny Lobster (_Panulirus interruptus_) of the California Coast, by Bennet M. Allen. Pp. 139-152, 2 figures in text. March, 1916 .15 13. Notes on the Marine Fishes of California, by Carl L. Hubbs. Pp. 153-169, plates 18-20. March, 1916 .15 14. The Feeding Habits and Food of Pelagic Copepods and the Question of Nutrition by Organic Substances in Solution in the Water, by Calvin O. Esterly. Pp. 171-184, 2 figures in text. March, 1916 .15 15. The Kinetonacleus of Flagellates and the Binuclear Theory of Hartmann, by Olive Swezy. Pp. 185-240, 58 figures in text. March, 1916 50 16. On the Life-History of a Soil Amoeba, by Charlie Woodruff Wilson. Pp. 241-292, plates 18-23. July, 1916 .60 17. Distribution of Land Vertebrates of Southeastern Washington, by Lee Raymond Dice. Pp. 293-348, plates 24-26. June, 1916 .60 18. The Anatomy of _Heptanchus maculatus_: the Endoskeleton, by J. Frank Daniel. Pp. 349-370, pls. 27-29, 8 text figures. December, 1916 .25 19. Some Phases of Spermatogenesis in the Mouse, by Harry B. Yocom. Pp. 371-380, plate 30. January, 1917 .10 20. Specificity in Behavior and the Relation between Habits in Nature and Reactions in the Laboratory, by Calvin O. Esterly. Pp. 381-392. March, 1917 .10 21. The Occurrence of a Rhythm in the Geotropism of Two Species of Plankton Copepods when Certain Recurring External Conditions are Absent, by Calvin O. Esterly. Pp. 393-400. March, 1917 .10 22. On Some New Species of Aphroditidae from the Coast of California, by Christine Essenberg. Pp. 401-430, plates 31-37. March, 1917 .35 23. Notes on the Natural History and Behavior of _Emerita analoga_ (Stimpson), by Harold Tupper Mead. Pp. 431-438,1 text figure. April, 1917 .10