MUSEUM OF COMPARATIVE ZOOLOGY. 37 



REPORT ON INVERTEBRATE PALEONTOLOGY. 



By Alpheus Hyatt. 



The revision of genera of Cephalopods for Zi'ttel's Palaeontology 

 has been completed, and another similar work, but more completely 

 descriptive, has been begun. In consequence of the great difficul- 

 ties presented in revising Orthoceratidae, this has not progressed 

 very rapidly. 



Prof. Perrin Smith visited the Museum and consulted our collec- 

 tions during the month of June in preparing a work upon the 

 Triassic Cephalopoda. His collections have enlarged the Triassic 

 fauna in this country fully as much as has Mojsisoric's work in 

 Europe, and he has been kind enough to add a small but choice 

 series of his invaluable materials to our collections. 



The department is indebted as heretofore to Dr. R. T. Jackson 

 for voluntary labor in the collection. He has revised the collection 

 of Tertiary Gastropods, arranging parts and improving its condi- 

 tion. He also did considerable work on the collections of Bryozoa 

 and Brachiopoda, and selected material for exhibition. 



Mr. A. W. Grabau continued his study of the Tertiary Fusidae 

 in preparing a thesis on that group. The collection of fossil In- 

 sects was transferred to the Entomological Department. A few 

 Brachiopods were turned over to the Zoological Department for 

 teaching. 



The Museum is indebted to the generosity of Mr. J. Willcox ol 

 Philadelphia for a choice collection of Tertiary fossils, mostly 

 Mollusca from the Atlantic coast deposits, from the Isaac Lea 

 collection in the Philadelphia Academy of Sciences. 



