y Olive Swezy.
Pp. 89-94, plate 12.

Nos. 6 and 7 in one cover. December, 1915 .25

8. On _Blepharcorys equi_, sp. nov., a New Ciliate from the
Caecum of the Horse, by Irwin C. Schumacher.
Pp. 95-106, plate 13. December, 1915 .10

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 betwe