REPORT OF NATIONAL. MUSEUM, 1924 65 



Nathan Banks and R. V. Chamberlin, of the Museum of Compara- 

 tive Zoology, Cambridge, Mass., have as usual kindly cooperated in 

 the determination of exotic spiders and of myriapods. Prof. T. D. A. 

 Cockerell, of the University of Colorado, continued his invaluable 

 collaboration and Miss Grace Sandhouse, working under his direction, 

 has studied the Museum collection of bees of the genus Osmia. and 

 completed a revision of the North American forms. Extensive 

 collections of unidentified material in various groups have, as usual, 

 been sent to a number of other correspondents for the benefit of 

 the National Museum, such as beetles to Howard B. Notman, Keene 

 Valley, N. Y., R. W. Dawson, St. Paul, Minn., and Charles 

 Schaeffer, Brooklyn Museum; membracids to Dr. W. D. Funk- 

 houser, Lexington, Ky. ; water bugs to Prof. H. B. Hungerford, 

 Lawrence, Kans. ; bees to Dr. T. H. Frison, Urbana, 111.; flies to 

 M. C. Van Duzee, Buffalo, N. Y. ; wasps to Dr. F. A. Fenton, Ames, 

 Iowa, and C. E. Mickel, St. Paul, Minn.; and bark beetles to Dr. 

 M. W. Blackmail, Syracuse, N. Y. 



The " volunteer staff " of the division of marine invertebrates, 

 alluded to in last year's report, embraced the following investigators, 

 to whom the division is under great obligations: Dr. Henry B. 

 Bigelow (Medusae, Ctenophora) ; Dr. L. R. Cary (Alcyonarians) ; 

 Dr. R. V. Chamberlin (Annelids and Gephyrea) ; Dr. Henri Cou- 

 tiere (Crangonidae (Crustacea) ) ; Dr. Joseph A. Cushman (Foram- 

 inifera) ; Prof. Arthur Dendy (Sponges) ; Prof. G. S. Dodds 

 (Fresh-water Entomostraca) ; Prof. Max M. Ellis (Discodrilids) ; 

 Dr. A. G. Huntsman (Ascidians) ; Frits Johansen (Fresh-water Ent- 

 omostraca) ; T. Kaburaki (Turbellaria) ; Dr. C. D wight Marsh 

 (Fresh-water copepods) ; Dr. Maynarcl M. Metcalf (Salpa, Pyro- 

 soma, Protozoa) ; Dr. J. Percy Moore (Leeches) ; Dr. Charles C. 

 Nutting (Hydroids) ; Dr. Raymond C. Osburn (Bryozoa) ; Dr. 

 Henry A. Pilsbry (Barnacles) ; Capt. F. A. Potts (Rhizocephalids 

 (Crustacea)); Prof. Frank Smith (Earthworms, fresh-water 

 sponges) ; Miss Caroline E. Stringer (Turbellaria) ; Dr. W. M. 

 Tattersall (Mysidacea (Crustacea)) ; Dr. Aaron L. Treadwell (An- 

 nelids) ; Dr. C. B. Wilson (Parasitic, and free-swimming marine 

 copepods). The divison of mollusks confesses indebtedness to Dr. 

 Frank C. Baker, Universitjr of Illinois, in connection with identifica- 

 tion of fresh-water material submitted to him, and to Dr. Bryant 

 Walker, Detroit, Mich., who similarly identified the Ancyli -collected 

 in Lower California by Dr. Bartsch. Miss E. Deichmann's work 

 on the holothurian material in the Museum has already been referred 

 to. Prof. Walter K. Fisher, director of the Hopkins Marine Station, 

 Pacific Grove, Calif., has continued his work on the starfishes in 

 connection with the second volume of Bulletin No. 76, which he 

 hopes to complete shortly. 



