jo ■ Report of the President 



volutes have been added to the handsome collections obtained 

 from Mrs. Oldroyd, while the Oldroyd purchase of last year 

 is distributed. Tentative arrangements have been under- 

 taken for the amplification of the West Coast shell collections 

 through the cooperation of the Southwest Museum at Los 

 Angeles. The D. Jackson Steward collection has been revised 

 and steps have been taken to make its many duplicates available 

 for exchange, in order to secure additional Philippine land 

 shells. A few transparencies have been added to the series in 

 the Hall of Shells, and, through the courtesy of the United 

 States National Museum, two admirable photographs taken by 

 Dr. Paul Bartsch have been secured which illustrate the habi- 

 tats respectively of Cerion glans of the Bahamas and Helix 

 (Cepolis) ovum-reguli of eastern Cuba. Mr. Gratacap had 

 taken up also the difficult question of a general catalogue and 

 had made plans for bringing it to completion. 



The Nahant Tide Pool Group, the most ambitious yet at- 

 tempted, is nearing completion. Its construction has demanded 



the most careful work, in both field and laboratory, 

 General of Mr. Miner and the members of the preparation 



Collections 6 staff > Mr - H - Mueller, Mr. S. Shimotori, Mr. C. E. 



Olsen and the late Mr. Ignaz Matausch. The work 

 on the Bryozoa Group has been resumed and will be prosecuted 

 vigorously during the year 191 8. The projected group showing 

 the associations at the bottom of Vineyard Sound has already 

 been mentioned. Substantial progress has been made in the 

 construction of individual exhibits for the synoptic series, with 

 especial reference to the Alcove of Protozoa. Many Infusoria 

 and two beautiful Radiolaria (Heliodrymus dendrocyclus and 

 Tholospira dendrophora) are especially noteworthy and are 

 particularly valuable for class instruction. Another important 

 item is the flagellate Proterospongia haeckeli. Other protozoan 

 models and two of nudibranch mollusks are well toward com- 

 pletion, as is also a new panel to illustrate color inheritance in 

 the "Four-o'clocks." A phylogenetic chart of the animal king- 

 dom is in preparation and will be particularly useful for the 

 study of the synoptic series. The educational value of the 

 Darwin Hall has greatly increased during the year; the hall 



