MUSEUM OF COMPARATIVE ZOOLOGY. 25 



REPORT ON INVERTEBRATE PALAEONTOLOGY. 



By Percy E. Raymond. 



The greater part of the year was devoted to the preparation and 

 study of the fossils collected by the Shaler Memorial Expedition 

 of 1917. This collection contains many species new to science, 

 and a manuscript has been prepared in which a large number of 

 the new species of trilobites are described. A part of the illus- 

 trations for this work have been drawn. Prof. Charles Schuchert 

 sent for determination and description the Ordovician trilobites 

 collected by Professor Twenhofel and himself in Newfoundland 

 and the Mingan Islands some years ago, and this large collection 

 served well to supplement the information derived from the 

 Museum collections from Virginia. 



Besides this work, the Curator was able to spend some time on 

 the main collection of trilobites, identifying and labeling the Cyclo- 

 pygidae and the species of some other genera belonging to various 

 families. He also determined three collections submitted by 

 the Geological Survey of Canada, and a few small lots for private 

 individuals. Sixty drawers of fossils received from the Boston 

 Society of Natural History were unpacked, sorted, and distributed, 

 largely to the stratigraphic collection. 



The Curator spent three weeks in June in collecting from the 

 Ordovician and Devonian strata of Iowa. A small but interesting 

 collection was obtained from the Maquoketa and Galena at 

 Dubuque, and a larger quantity of material from the Maquoketa 

 in the vicinity of Clermont, while one day was spent in picking 

 up the beautifully preserved Upper Devonian brachiopods on 

 Lime Creek. During the greater part of the trip Mr. J. H. 

 Bradley, Jr., of Dubuque, assisted, and his efforts contributed 

 many fine specimens. The Museum is also very grateful to Mr. 

 A. G. Becker of Clermont, whose guidance made the collecting 

 in the Maquoketa possible, and whose donations greatly enriched 

 the results. 



Prof. W. H. Twenhofel has returned to the Museum the L T pper 

 Ordovician and Silurian fossils, collected mainly by himself during 



