6 ANNUAL REPORT OF THE 



and catalogued all new accessions and about 2,000 lots of specimens 

 previously received. He estimates that only 1% of the Gastro- 

 poda are not catalogued. During the year, Mr. Clapp made a 

 collection of Mollusca and other invertebrates in the ponds and 

 streams of Plymouth County. 



Dr. Clark's Museum work consisted of the identification and 

 cataloguing of the new accessions and the preparation of reports 

 upon several collections. The final part of the Memoir on the 

 Hawaiian and other Pacific Echini was published in March, and 

 two reports on collections of ophiurans were completed. The 

 collection of echinoderms contains 2,318 species and nearly 

 90,000 (89,998) specimens. 



Dr. H. B. Bigelow prepared two reports, one on the Medusae 

 and siphonophores collected by the Bache in the western Atlantic, 

 and a second on the results of the 1916 cruise of the Grampus. 



Professor Raymond continued the rearrangement of the tri- 

 lobites completing the Agnostidae, Harpedidae, and Goldiidae. 

 He also finished a memoir dealing with the appendages of tri- 

 lobites, and made a final revision of a report on some new fossils 

 from the Trenton, collected by the Geological Survey of Canada. 

 Professor Raymond assisted the authorities of the Geological 

 Museum of Middlebury College in the identification of their col- 

 lection of fossils. 



Miss Elvira Wood was employed for eight months and continued 

 the revision and arrangement of the study series of Tertiary Gas- 

 tropoda. 



Mr. R. W. Sayles reports that during the winter he was engaged 

 upon a memoir dealing with the relations of the Squantum tillite 

 and the Connecticut River clays. He states that there have been 

 but few accessions received during the year, a record to be quali- 

 fied by noting that his own munificent donation, George Carroll 

 Curtis's model of the crater of Kilauea, Hawaii, is the most valu- 

 able gift ever received by the Geological section of the Museum, 

 and of the highest value for exhibition and for instruction. Like 

 the previous work of Mr. Curtis, it gives a trustworthy represen- 

 tation as to form and color; it is the result of a careful personal 

 survey, supplemented by accurate photographic data, and sup- 

 ported for four consecutive years by patient, generous, and enthusi- 

 astic encouragement. The Museum wishes to join with Mr. 

 Sayles in thanking Prof. T. A. Jaggar and Dr. H. O. Wood for the 

 many courtesies shown Mr. Curtis when in Hawaii. 



The exceptional skill of Mr. George Nelson in all branches of 



