29 



The rapidity with which the work has been accomplished is 

 largely due to Mr. R. T. Jackson's energy, and ability in the 

 handling of collections. Mr. Henry Brooks has also contributed 

 materially to the same end. Both of these gentlemen have re- 

 ceived the benefit of opportunities for study in collections and 

 instruction from the Assistant, which have technically repaid 

 them ; but they have chosen to return their obligations with a 

 devotion to the interests of the Museum which merits the thanks 

 of the department. 



The larger part of the Assistant's time has been given to the 

 arrangement of the Trilobites and Cephalopods. The genera 

 and species of the former have been collated from all the older 

 collections and also from the Barrande and Walcott collections. 

 Mr. Jackson has done similar work upon the Jurassic Lamelli- 

 branchs. Mr. C. D. Walcott spent several days in March working 

 over his collection and naming the Brachiopods. 



The condition of special collections may be reported as follows. 



The Walcott collection has been finished by the Assistant and 

 Mr. Jackson, and received, as noted above, attention from Mr. 

 Walcott himself. It fills 317 trays and contains some large slabs. 



The unpacking of the Senary collection has been finished, and 

 the preliminary distribution and labelling completed by Mr. Jack- 

 son. The collection fills 877 trays, representing all classes of 

 the fossil Invertebrates of the Bohemian Basin. Work upon 

 the classification of the Trilobites has been begun by the 

 Assistant. 



A collection from the Prague Museum has been unpacked and 

 distributed. It fills 15 trays. 



A collection from Ireland, presented by the Director in 1875, 

 has been unpacked and distributed. It fills 6 trays. 



The Barrande collection, received in 1875, has been un- 

 packed and distributed. There were 26 trays of Trilobites and 

 9 trays of Brachiopods ; all fine specimens, named by that emi- 

 nent palaeontologist. 



The Walcott collection of Palaeozoic fossils from Nevada has 

 been unpacked, but not distributed. It fills 13 trays. 



The extensive collection of Solenhofen and Kelheim fossils 

 purchased from Haberlein had been in part unpacked by Pro- 

 fessor Hamlin. This has been finished and distributed. It fills 

 152 trays and contains 5 slabs. 



