1 72 The American Geologist. March, 1900 
mals to individual specimens weighing from 500 to 2,000 pounds each. 
The collections are rich in Dinosauria, especially in examples of Tri- 
ceratops and Stegosaurus. while the series of Titanotherium skulls 
is one of the best, if not the best, in existence. It contains fifty or 
more complete examples cleaned, and a number in the rough, besides 
many hundred bones. 
Among the specimens transferred are the types of forty or more 
species, including dinosaurs, Jurassic, Cretaceous and Tertiary mam- 
mals. Among the types are the following: 
DINOSAURS. JURASSIC MAMMALS. 
Diplodocus longus. Paurodon valens. 
Labrosaurus ferox. Manacodon rarus. 
Camptosaurus nanus. Enneodon afifinis. 
Triceratops sulcatus. Enneodon crassus. 
Triceratops californis. Laodon venustus. 
Triceratops obtusa. 
Pleorocoelus nanus. CRETACEOUS MAMMALS. 
Geratosaurus nasicornis. Prinocodon crassus. 
Ceratops montanus. Cimolodon agilis. 
Ceratops alticornis. Telacodon prccstans. 
CROCODILES. Oracodon cenulus. 
Rhytinodon rostratus. Allacodon pumilis. 
SNAKES. Batodon tenuis. 
Coniophis precedens. Allacodon fortis. 
The transfer of these great collections to Washington without the 
loss of any material, either through imperfect recording or through 
misunderstanding as to ownership of specimens, reflects the greatest 
credit on the businesslike methods and the integrity of professor 
Marsh. The addition of the material to the National Museum places 
it in the front rank among museums in its collection of vertebrate 
fossils. It is necessary that some gaps in the collections be filled, and 
I sincerely trust that it will be possible for the museum to do this at an 
early date. 
Yours respectfully, 
[Signed] Chas. D. Walcott, 
Director. 
Smithsonian Institution, 
December 22, 1899. 
Dear Sir: 
I take pleasure in acknowledging the receipt of your letter of the 
eighth instant, advising me that you have transferred to the National 
Museum all the vertebrate fossils collected by the late professor O. C. 
Marsh belonging to the United States Government, subject only to the 
condition that such material as is required may be used for study and 
illustration in completing the monographs which were in preparation 
by professor Marsh at the time of his death. 
