76 EEPORT OF NATIONAL MUSEUM, 1920. 



tion of authentically located marine Hawaiian shells. Taken to- 

 gether with the Albatross deep-water dredgings, it puts our Hawaiian 

 series at the head of the list; the material is of the best, the series 

 of specimens shows stages and local variations, the operculate gas- 

 tropods in most cases have the opercula carefully preserved. The 

 specimens are accompanied by interesting field notes. The collec- 

 tions were made by Mr. Thaanum and his brother-in-law, Mr. J. B. 

 Langford. These two men have devoted all their spare time to this 

 undertaking and the collections are the result of years of effort in a 

 region presenting unusual difficulties to the collector. The collection 

 is being reported upon in the monograph on the Hawaiian marine 

 mollusks in preparation by Dr. W. II. Dall. A no less valuable 

 accession is due to the generosity of Mr. John B. Henderson, of 

 Washington City, a regent of the Smithsonian Institution, who 

 purchased and presented to the Museum part of the William F. 

 Clapp collection of New England land and fresh water mollusks, 

 consisting of about 10,000 specimens. He also donated 33 species 

 (about 200 specimens) of Sphaeriidae from the United States and 

 Naiades from North and South America. The continued contribu- 

 tions from Dr. W. L. Abbott's explorations in Santo Domingo, more . 

 than 375 specimens, have proven quite valuable. As in previous 

 years the U. S. Bureau of Fisheries forms one of the chief sources 

 of material received in this Division. In addition to the ones par- 

 ticularly mentioned below as exceptionally valuable there were re- 

 ceived a number of smaller lots of miscellaneous invertebrates. Sev- 

 eral of the collections have been reported on, such as the Cephalopods, 

 including 20 types of new species, collected by the steamer Albatross 

 in the Northwestern Pacific and reported on by Mr. Madoka Sasaki; 

 240 Philippine Annelids, remainder of the collection reported on 

 by Dr. A. L. Treadwell; the final installment of the Medusae and 

 Siphonophores, including type specimens; collected by the steamer 

 Bache and reported on by Dr. H. B. Bigelow. There was also a col- 

 lection of Philippine Planarians with a set of ten colored drawings 

 with descriptive notes, secured by the Albatross Expedition, 1907-10. 

 The acquisition of type material is of such importance and has been 

 made such a prominent feature of the national collection that it 

 requires separate mention. Thus, among a number of miscellaneous 

 accessions from various bureaus of the Department of Agriculture 

 there was one new earthworm from Guatemala, submitted by the 

 Federal Horticultural Board. From the British Museum type ma- 

 terial of various recent Bryozoa was obtained in exchange. Mr. 

 C. M. Weber, Balabac, Philippine Islands, donated 20 species (1,119 

 specimens) including types one new species and three subspecies 

 from the Philippines. Among a number of mollusks from Guate- 

 mala and Mexico presented bjr Mr. A. A. Hinkley, Du Bois, Illinois, 



