LIST OF PUBLICATIONS. 



173 



Jackson, Robert Tracy — Continued. 



Describes and figures nine 

 species belonging to the genera 

 Clypeaster, Encope, Echinolam- 

 pas, and Schizaster. Six of the 

 species are new. 



Knowlton, F. H. A fossil flora from 

 the Frontier formation of southwest- 

 ern Wyoming. 



Prof. Paper U. S. Geol. 

 Surv., 108-F, Aug. 

 22, 1917, pp. 73- 

 107, pis. 27-29. 

 The locality which afforded 

 the plants described in this 

 paper was discovered in 1843 

 by Capt. John C. Fremont while 

 engaged on an exploring expedi- 

 tion to the Rocky Mountains. 

 The beds now called the Fron- 

 tier formation were first sup- 

 posed to be of Jurassic age, but 

 larger and better collections 

 made in recent years have dem- 

 onstrated that they are Creta- 

 ceous (Colorado) in age. This 

 flora embraces 25 forms of 

 which 7 are ferns, 1 an Equi- 

 setum, 1 a monocotyledon, and 

 the remaining 16 dicotyledons. 

 Evidence of insects in Frontier 

 time is indicated by the pres- 

 ence of an egg-mass on one leaf 

 and by a symmetrically looping 

 mine in the leaf substance of 

 another. They are believed to 

 belong to the Microlepidoptera. 



Fossil floras of the Vermejo and 



Raton formations of Colorado and 

 New Mexico. 



Prof. Paper U. S. Geol. 

 Surv., 101, 1917, 

 pp. 223-435, pis. 

 30-113. 

 For 25 years the principal 

 coal fields of the Raton Mesa 

 region of Colorado and adjacent 

 New Mexico have been regarded 

 as referable to the Laramie for- 

 mation. A recent discovery of 

 an unconformity in the midst of 

 this section necessitated the re- 

 examination of all available 

 paleontological data. It has 

 now been ascertained that the 

 Laramie is absent from this 

 whole region. The beds below 

 the unconformity (named the 

 Vermejo formation) are Mon- 

 tana in age and contain flora 

 of 108 forms, while the beds 

 above the unconformity (the 

 Raton formation) are Eocene in 



Knowlton, F. H. — Continued. 



age and embrace a flora of 148 

 species. So far as now known 

 only four species are common to 

 the Raton and Vermejo forma- 

 tions. The flora of both forma- 

 tions is described and illus- 

 trated in full. 



Lull, Richard Swan. Fossil foot- 

 prints from the Grand Canyon of the 

 Colorado. 



Amer. Journ. >S'ci.. 45, 

 May, 1918, pp. 337- 

 346, pis. 1-3, figs. 

 1-4. 

 Describes and figures a speci- 

 men from the National Museum 

 collection as the paratype of 

 Laoporus noblei, new species. 



Osborn, Henry Fairfield. Equidae of 

 of the Oligocene, Miocene, and Plio- 

 cene of North America, iconographic 

 type revision. 



Memoirs Amer. Mus. 

 Nat. Hist. (n. s.), 

 2, Pt. 1, June 10, 

 1918, pp. 1-330, 

 pis. 1-54, figs. 

 1-173. 

 In this revision the author 

 has redescribed and refigured 

 most of the fossil horse mate- 

 rial of the National Museum col- 

 lection. 



Rathbun, Mary J. Description of a 

 new species of crab from the Califor- 

 nia Pliocene. 



Proc. U. S. Nat. Mus., 

 53, No. 2214, Aug. 

 15, 1917, pp. 451, 

 452, pi. 59. 

 Description of a fossil crab 

 allied to the recent Cancer an- 

 tennarius. The specimen was 

 obtained from the foundation 

 of a large building in Los An- 

 geles. 



Shufeldt, R. W. Fossil remains of 

 what appears to be a passerine bird 

 from the Florissant shales of Colo- 

 rado. 



Proc. U. 8. Nat. Mus., 



53, No. 2215, Aug. 



15, 1917, pp. 453- 



455, pis. 60, 61. 



Describes and figures a poorly 



preserved specimen deposited in 



the Museum by Prof. Ira E. 



Cutler. 



