458 C. Schuchert — Mounted Skeleton of Trieeratops prorsus. 



and was best filtered and washed by decantation. The results 

 were lower than when the cadmium was precipitated as the 

 carbonate, as is shown by the following table : 





CdO taken. 



CdO found. 



Error. 



. of exp. 



grm. 



grm. 



grm. 



1. 



0-1277 



0-1277 



±0-0000 



2. 



0-1277 



0-1270 



— 0-0007 



3. 



0-1277 



0-1260 



— 0-0017 



4. 



0-1277 



0-1286 



+ 0-0009 



5. 



0-1362 



0-1350 



-0-0012 



6. 



0-1399 



0-1389 



-o-ooio 



7. 



0-1703 



0-1697 



— 0-0006 



8. 



0-1703 



0-1693 



— 0-0010 



9. 



0-1703 



0-1699 



— 0-0004 



10. 



0-1788 



0-1802 



+ 0-0014 



11. 



0-2129 



0-2139 



+ 0-0010 



12. 



0-2129 



0-2128 



-o-oooi 



While the figures show that fair results may be obtained by 

 the hydroxide method, it can be compared with the carbonate 

 method neither for accuracy nor convenience : the precipitate 

 does not attain the same granular form as that of the carbo- 

 nate ; it is hard to filter, difficult to wash, and can be removed 

 completely from the beaker in which precipitation takes place 

 only with the utmost difficulty. 



Art. XLIX. — The Mounted Skeleton of Trieeratops prorsus 

 in the IT. S. National Museum ; by C. Schuchert. (With 

 Plate XV.) 



Note. — At various times articles on Trieeratops by the late 

 Professor Marsh have been printed in this Journal, and as the 

 U. S. National Museum is the first institution to possess a 

 mounted skeleton of this, the largest-headed Dinosaur, it is 

 deemed advisable to complete the records by reproducing here 

 the illustration recently published in the Proceedings of that 

 Museum.* Mr. G. W. GilmOre did the mounting, and from his 

 article the following extracts are taken : 



Among the vertebrate fossils included in that part of the 

 Marsh collection, now preserved in the United States National 

 Museum, are the remains of several individuals pertaining to 

 the large Cretaceous dinosaur, Trieeratops. All of this 

 material, which comes from the Laramie division of the Cre- 

 taceous, was collected by or under the supervision of the late 

 Mr. J. B. Hatcher in the northeastern part of Converse 

 County, Wyoming, a locality made historic by the researches 

 * Article 1426, vol. xxix, 1905, pp. 433-435, 2 plates. 



