146 CALIFORNIA ACADEMY OF SCIENCES [Paoc. 4th Ser. 



Tertiary fossils to be used in connection with his studies of coastal plains 

 geology. Others who have borrowed certain specified groups in past 

 years, but who have not completed their studies at this date, are : Dr. 

 Earl L. Packard, University of Oregon, Cretaceous fossils ; Dr. S. S. 

 Berry, Redlands, California, Chitons ; and Dr. W. S. W. Kew, fossil sea 

 urchins. 



Faithful and very valuable assistance has been rendered in the Depart- 

 ment by Messrs. Merle Israelsky and Georges Vorbe, students of the 

 University of California, and by Mr. William Barbat of St. Mary's College. 



G. Dallas Hanna, Curator. 



Department of Invertebrate Zoology 



The collections have been increased by specimens collected by the 

 Curator and Mr. W. S. Wallace of Monterey Bay. Mr. Wallace has 

 specialized on hydroids and is naming the material as rapidly as acquired. 



A trip to Vancouver Island which the Curator had intended to make in 

 October had to be postponed until April on account of unfavorable tides 

 and the closing of the Nanaimo Biological Station, which was to be used 

 as a base of operations. The primary object of the trip was to study in 

 life the shore and shallow-water sea stars, of which a considerable num- 

 ber of nominal forms have been described from that general region. 



Dr. G. Dallas Hanna made a collection of sea stars, with extensive color 

 notes, at St. Paul Island, Bering Sea, and at Unalaska, during the summer. 



Dr. Gertrude Van Wagenen, who is studying at the Hopkins Marine 

 Station, the corals and actinians of Monterey Bay, will contribute a set of 

 named specimens. W. K. Fisher, Curator. 



Librarian's Report 



The growth of the library during the year 1920 was greater than during 

 the preceding year, accessions having increased by purchase, by exchange 

 and by gift. The low rate of foreign exchange made it seem advisable to 

 place larger orders with European dealers and by this means many valu- 

 able sets were received at a very reasonable figure. Recovery from the 

 European War has made possible the resumption of exchanges with many 

 foreign societies, and lastly, more than the usual number of gifts have 

 been received from friends of the Academy. Accessions to the library 

 for the year number 1370 bound volumes, of which 526 were received by 

 gift, 544 by purchase and 300 through exchange with other institutions. 

 In addition to the bound volumes a large number of pamphlets and parts 

 of volumes were received. By far the larger part of the books and pam- 

 phlets presented to the Academy library were from the Adolph Sutro 

 library, received through the generosity of Doctors Geo. W. and Emma 

 Sutro Merritt. This material from the Sutro library includes 402 bound 

 volumes and 4248 miscellaneous numbers of government bulletins and 

 reports and similar unbound material, besides a large number of separate 

 papers, many of which will be useful later in completing sets. During 

 the year 2200 volumes were accessioned, making the total number of 

 volumes accessioned on December 31, 1920, 14,080. 



