UNIVEESITY OF CALITOENIA PUBLIOATIONS 



Kote. — Tie University of Califomla PublicaUona are offered In exchange for the pabll- 

 catlons of learned societies and Institutions, universities, and libraries. Complete lists of 

 all the publications of the Univeirslty will be sent upon request. For sample copies, lists 

 of publications or other information, address the MANAGES OF THE UNiVEESirY 

 PEESS, BEEKELEY, CAIIFOENIA, V. S. A. All matter sent In exchange should be 

 addressed to THE EXCHANGE DEPAETMENT, UNIVEESITY LIBEAEY, BEEKELEY, 

 OAUFOENIA, U.S. A. 



WILLIAM WESLEY & SON8, LONDON 



Agent for the series in American Archaeology and Ethnology, Botany, Geology, 



Physiology, and Zoology. 



ZOOLOGY. — O. A. Kofoid, S. J. Holmes, and J. Grlnnell, Editors. 



This series contains the contributions from the Department of Zoology, from the 

 Marine Laboratory of the Scripps Institution for Biological Seaearch, at La JoUa, 

 California, and from the Califomla Museum of Vertebrate Zoology in Berkeley. 



Cited as Univ. Calif. Pubt ZooL 



Volume 1, 1902-1906, 317 pages, -with 28 plates $3.60 



Volume 2, 1904-1906, xvll + 382 pages, with 19 plates $3.50 



Volume 8, 1906-1907, 883 pages, with 23 plates $3.50 



Volume 4, 1907-1908, 400 pages, with 24 plates $3.50 



Volume 5, 1908-1910, 440 pages, with 34 plates $3.60 



Volume 6, 1908-1911, 478 pages, with 48 plates $3.60 



Volume 7, 1910-1912, 446 pages, with 12 plates $3.60 



Volume 8, 1911, 357 pages, with 25 plates $350 



Volume 9, 1911-1912, 365 pages, with 24 plates $3.60 



Volume 10, 1912-1913, 417 pages, with 10 plates $3.50 



Volume 11, 1912-1914, 538 pages, with 26 plates $6.00 



Volume 12, 1913-1916, 558 pages, with 22 plates $6.00 



Volume 13, 1914^1916, 529 pages, with 39 plates $6.00 



Volume 14, 1914 1918, 452 pages, with 60 plates ^ $5.00 



Volume 15, 1915-1916, 360 pages, with 38 plates $4.00 



Volume 16, 1915-1917, 522 pages, with 46 plates $5.00 



Volume 17, 1916-1918, 545 pages, with 24 plates $6.00 



Volume 18, 1917-1919, 629 pages, with 20 plates $5.00 



Volume 19, 1919-1920, 480 pages, with 33 plates $5.00 



Vol. 19. 1. Eeaction of Various PlanlEton Animals with Bef erence to Their Diurnal 



Migrations, by Calvin O. Esterly. Pp. 1-83. April, 1919 .86 



2. The Pteropod Desmopterus pacificas (sp. nov.), by Christine Essenberg. Pp. 



85-88, 2 figures in text. May, 1919 .06 



3. Studies on Giardia microti, by William O. Boeck. Pp. 85-136, plate 1, 19 



figures In text April, 1919 .60 



i. A Comparison of the Life Cycle of Crithidia with that of Trypanosoma in 



the Invertebrate Host, by Irene McCulloch. Pp. 135-190, plates 2-6, 3 



figures In text October, 1919 _ 60 



6. A Muscld Larva of the San Francisco Bay Begion Which Sacks the Blood 



of Nestling Birds, by O. E. Plath. Pp. 191-200. February, 1919 .10 



6. Binary Fission In Collodictyon triciliattim Carter, by Bobert Clinton Bhodes. 



Pp. 201-274, plates 7-14, 4 figures in text. December, 1919 1.00 



7. The Excretory System of a Stylet Cerc&rla, by WUllam W. Oort. Pp. 275- 



281, 1 figure in text August, 1919 .10 



8. A New Distome from Eana aurora, by William W. Cort Pp. 283-298, 5 



figures in text November, 1919 SO 



9. The Occurrence of a Bock-borlng Isopod along the Shore of San Francisco 



Bay, California, by Albert L. Barrows. Pp. 299-316, plates 16-17. De- 

 cember, 1919 .26 



10. A New Morphological Interpretation of the Structure of Noctiluca, and Its 

 Bearing on the Status of the Cystoflagellata (Haedcel), by Charies A. 

 Kofoid. Pp. 817-334, plate 18, 2 figures In text February, 1920 .25 



