MUSEUM OF COMPARATIVE ZOOLOGY. 25 



REPORT ON THE CRUSTACEA AND MOLLUSCA. 



By Walter Faxon. 



Since the last Annual Report was printed, Miss E. B. Bryant has 

 finished labelling and entering in the Museum Catalogue the collec- 

 tion of shells received from R. E. Call in 1898. A brief notice of 

 this collection (which makes 5,778 entries in the catalogue) will be 

 found in the Annual Report for 1897-98. The incorporation of 

 such a large amount of material with the old collection has neces- 

 sitated the rearrangement of the whole. The Unionidse alone now 

 occupy 358 of the large Museum sliding-trays. In the rearrange- 

 ment of the Unionidae I have followed the system of Simpson's 

 " Synopsis of the Naides," 1900. Five hundred and sixty-four 

 species of Naides are represented in our collection. 



For gifts to the department during the past year the Museum 

 owes thanks to Messrs. T. D. Cockerell, C. B. Davenport, F. D. 

 Godman, R. T. Jackson, and E. B. Williamson. Mr. Godman's 

 contribution consists of a lot of Land Mollusks from Central 

 America, part of the material worked up by Yon Martens for the 

 " Biologia Centrali-Americana." 



Mr. W. P. Hay has lately spent two weeks in the study of the 

 Museum collection of Astacidae. 



