1915.] NATURAL SCIENCES OF PHILADELPHIA. 585 



tions, including Messrs. A. F. Satterthwait, A. P. Morse, E. Daecke, 

 C. W. Long, W. T. Davis, J. C. Bradley, Charles Schaeffer, J. C. 

 Crawford, S. A. Rohwer, A. B. Gahen, R. A. Cushman, A. N. Caudell, 

 and A. Avinoff. 



Material has been loaned to Dr. E. M. Walker. 



Other Invertebrates. 



Mr. H. W. Fowler has looked after the alcoholic material and 

 arranged numerous small local collections of spiders, Crustacea, etc. 

 Mr. J. H. Emerton has studied the series of spiders during the year. 

 Specimens of annelids have been loaned to Dr. C. A. Kofoid, and 

 J. F. Daniel. 



Invertebrate Fossils. 



Dr. A. P. Brown has spent considerable time at the Academy 

 during the summer months studying the collections in this depart- 

 ment and in conjunction with Dr. Pilsbry has prepared a report on 

 the Oligocene fossils obtained by Mr. Lloyd B. Smith in Colombia. 



Drs. A. Olsen and L. W. Stephenson have spent some time studying 

 the collections, and material has been loaned to F. W. Stanton and 

 T. Wayland Vaughan. 



Vertebrate Fossils. 



The large slabs of fossil footprints together with certain geological 

 specimens have been arranged on the wall spaces between the windows 

 in the mineralogical hall. 



Material was loaned during the year to Drs. 0. P. Hay and J. C. 

 Merriam, and in return for the courtesy Dr. Merriam presented the 

 Academy with a specimen of Smilodon from the asphalt deposits 

 of the Rancho La Brea, California. 



Herbarium. 



Mr. Stewardson Bro\\Ti's continued illness has again kept him from 

 his duties in charge of the Herbarium for about half of the past year, 

 while for several months he was absent with Dr. N. L. Britton on a 

 collecting trip to Porto Rico. 



During his absence the Academy has again been dependent upon 

 the voluntary services of Messrs. Bayard Long and S. S. Van Pelt, 

 who have generously looked after the general herbarium in addition 

 to their continued care and development of the local herbarium 

 in which they have interested themselves for a number of years. 

 38 



