MUSEUM OF COMPARATIVE ZOOLOGY. / 



on the Canadian Arctic expedition of 1913-1915 and during the 

 cruise of the Grampus in 1916. 



Prof. P. E. Raymond, Curator of Invertebrate Palaeontology, 

 as Associate Professor of Palaeontology, gives somewhat more 

 than half of his time to the instruction of students in Harvard 

 University. His field-work in both capacities and the work of 

 his advanced students accrues very largely to the advantage of the 

 collections of the Museum. During the year, Professor Raymond 

 collected in the Ordovician and Devonian strata of Iowa, and in 

 the Ordovician of southwestern Virginia and eastern Tennessee. 

 From his recent collectings, Professor Raymond has secured and 

 described a large number of new species of trilobites. He has 

 also identified and labeled a number of trilobites belonging to 

 several families, and has determined several collections of fossils 

 sent for that purpose by the Geological Survey of Canada, and 

 by Yale University. The accessions include a large series of 

 fossils from many localities and formations, from the Boston 

 Society of Natural History, a considerable series of corals and 

 mollusks from the Fiji Islands, from Prof. W. G. Foye, and many 

 fine specimens from Mr. J. R. Bradley, Jr., and Mr. A. G. Becker. 



Mr. R. W. Sayles, Curator of the Geological collections, spent 

 most of his time in the preparation of a memoir entitled Seasonal 

 deposition in aqueo-glacial sediments. Toward the publication 

 of this memoir Mr. Sayles has generously contributed the illus- 

 trations. The only addition of importance received during the 

 year consists of twenty-seven specimens received in exchange 

 from the Boston Society of Natural History. A recent census of 

 the collection gives a total of 5,850 specimens, 3,615 illustrative of 

 dynamical and structural geology, and 2,235 specimens of eco- 

 nomic geology. 



Though the employment of a Preparator in a large museum 

 offers little opportunity for detailed report, it consists of an endless 

 mass of varied work, at times requiring the most skilful workman- 

 ship, and at times entailing the most monotonous drudgery. 

 Mr. George Nelson, during the year, has mounted for exhibition 

 vertebrates of every class, has repaired and mounted skeletons of 

 the same, made skins of mammals and birds from fresh material, 

 and repaired and made over old specimens of the same, and has 

 made casts of a considerable series of unique fossil vertebrates. 

 Mr. Nelson has also made some elaborate colored drawings and 

 his excellent photographic work has been utilized for the illus- 

 tration of Museum publications and not infrequently for the 

 benefit of other institutions and investigators. Mr. A. B. Fuller's 



