AMBLYPODA. 511 



genera will be found which connect both these orders more nearly with 

 primitive types o£ Artiodadyla, but as yet we are not acquainted with them. 

 The order Amhhjpoda was first defined by the writer in the Systematic 

 Catalogue of the Vertebrata of the Eocene of New Mexico, published, in 

 April, 1875. The two suborders Pantodonta and B'mocerata were originally 

 defined by the writer in "The Short-footed Ungulata of Wyoming", pub- 

 lished March, 1873, in the following language: 

 "No incisors; nasal bones elongate; astragalus articulating with both 



navicular and cuboid ; no third trochanter Dinocerata. 



''Dentition comiilete, i. e., incisors present; ? nasal bones; astragalus 

 articulating with both navicular and cuboid ; a rudimental third 

 trochanter Pantodonta f 



The name Dinocerata was then proposed as a correction of '^Dinocerea," 

 originally introduced by Professor Marsh* for the animals which it includes, 

 under the belief that it constituted a distinct order of 2IammaUa, which, 

 however, he did not characterize. Shortly afterward (Januarj-, 1873t), I 

 gave the first general synopsis of the characters of the species of the group 

 then contained in my collection, in which they resemble the Prohoscidea, as 

 follows: "1. The shortness of the free portion of the nasal bones; 2. The 

 malar bone is rod-like, and forms the middle element of the zygomatic arch; 

 3. The cervical vertebrae are exceedingly short and transverse; 4. The femur 

 is without third trochanter; 5. Its condyles are contracted, and the naiTOw 

 intercondylar fissure is prolonged far forward; 6. The spine of the tibia 

 is wanting, and the glenoid cavities separated by a longitudinal keel; 



7. The astragalus is not hourglass-shaped above, but with a uniform face; 



8. The phalanges are short and stout, and represent several toes." To 

 these may be added two external characters, which directly result from the 

 osteological, viz: 9. The possession of a proboscis; this is proven by the 

 extreme shortness and stoutness of the free portion of the nasal bones, by 

 the very short cervical vertebrae, and by the fact that the nasal and pre- 

 maxillary bones are deeply excavated at their extremities, with surrounding 

 osseous eminences for the origin of the muscles of the tnmk; 10. The 

 extension of the femur below the body, so that the leg was extended with 



*Amer. Jour. Sci. and Arts, 1872, October, 167'1 (separata September iT). 



tThe extra copies of this paper, -which contained all except the character number "1", were 

 published January 16. 



