MUSEUM OF COMPARATIVE ZOOLOGY. 35 



REPORT ON INVERTEBRATE PALAEONTOLOGY. 



By Percy E. Raymond. 



During the year, a part of the fossils collected by Professor 

 Twenhofel and myself in the course of the Shaler Memorial 

 Expedition to the Baltic Region has been received. One box 

 from Belgium, three from Russia, twelve from Sweden, and five 

 from Norway have arrived, while eight boxes, containing all the 

 Ordovician and Silurian fossils from Esthonia were, at last ac- 

 counts, still at Libau, Russia. My time during the year has been 

 devoted largely to the study of the Ordovician fossils which have 

 been received, and the preparation of a report on the Expedition. 

 Practically all the Ordovician trilobites have been identified, adding 

 many genera and species not previously represented in the collec- 

 tions of the Museum. Among the trilobites the Asaphidae pre- 

 dominate, and many of the species are represented by complete 

 specimens. In addition to the trilobites, the cephalopods and 

 gastropods, and a large proportion of the brachiopods and cystids 

 of the Russian collection have been identified. Among the cystids 

 are a number of undescribed species. 



Two short trips were made during the spring and summer to 

 the Mohawk Valley of New York, on both of which trips a quan- 

 tity of interesting material was collected. A new locality for the 

 imperfectly known Tribes Hill fauna was discovered, and a col- 

 lection obtained from it. Two weeks were spent in Pennsylvania, 

 in studying and collecting fossils from certain Ordovician strata 

 to obtain information needed for the completion of my report on 

 the trip to the Baltic. The expenses of this trip were paid from 

 the Shaler Memorial fund. 



Mrs. N. A. Clapp rendered very efficient service for a few weeks 

 in May and June, during which time she wrote many labels and 

 catalogued a large number of specimens. 



The following accessions, other than those mentioned above, 

 have been received: — 



By donation; forty specimens of invertebrate fossils from Prof. 

 J. C. Moberg, Lund, Sweden. 



