Holland: A New Species of Apatosaurus. 145 



4. The facets for the attachment of the capitulum of the ribs in 

 the dorsals are much lower down in A. excelsus than in A. .louisce. 

 This fact also imparts to the vertebrae when compared with each other 

 a very different appearance. 



5. The neural spines of the caudals at the middle of the tail in A. 

 louisce are more erect, more nearly approaching the perpendicular, 

 than in A. excelsus, as represented in the specimen in the Carnegie 

 Museum, as well as in the type preserved in the Peabody Museum, 

 so far as the material there represented permits comparison. 



There are numerous diagnostic characters which the writer does 

 not take up in the present paper, but which he hopes to be able shortly 

 to present in the larger publication already referred to. 



The type is fully adult, as is shown not only by its great size, but 

 by the complete coossification of the pubic and ischial bones where 

 they unite in forming the acetabulum, and also by the coossification 

 of the pubic and ischial bones at their distal extremities. 



The species is named in honor of Mrs. Andrew Carnegie. 



