KNowi.TON.] DESCRIPTION OF SPECIES. 63 



been (li.stortod. As Lesijiu'reiix sug-ovsts (op. cit. , p. 13), this leaf has 

 astrikiiio' I'oseiublanco to \\\h Acer <l!ni()r2>hiini, but the specimen is not 

 sufficiently perfect to warrant the assertion that it represents a leaf of 

 that species. 



Locality. — Van Horn's ranch, South Fork of John Day River, about 

 12 miles west of Mount Vernon, Grant County, Oregon. Collected 

 by Maj. Charles E. Bendirc (U. S. Nat. Mus., No. SSO-l). 



LiQUIDAMBAR I'ACMYPHYLLUM, n. sp. 

 PI. IX, fig. 1. 



Leaf of small size, very thick in texture, five-lobed, the lobes short, 

 ovate, or ovate-lanceolate, acute; margin serrate throughout, the teeth 

 rather large, upward pointing; ribs arising just inside the lower mar- 

 gin of the blade, very strong, passing to the apices of the lobes; sec- 

 ondary branches numerous, alternate, often irregular, camptodrome, 

 arching near the margin ; nervilles very irregular, producing a coarse, 

 heavy network. 



The single broken example figured is all that was found in the col- 

 lections. It was clearly five-lobed, but only the two lower and a part 

 of one middle lobe is preserved. The total length appears to have been 

 between 5 and 6 cm., or possibl}" a little more. The width between 

 the two lower lobes is 5.5 cm. 



This species liad evidently a very thick, pulp}" leaf, and the nerva- 

 tion is especially strong, particularh^ the ribs and nervilles. 



Leaves of this genus appear to be rare in the Mascall beds, and the 

 leaf under consideration is wholly unlike any before detected. The 

 leaves referred to L. eui'op-seiun jHitvluiih and L. protcnsum are thin, 

 being like the living species in texture, whereas ours is clearl}' a thick 

 leaf with a strong nervation. It is also unlike Z. californicwn., from 

 the Auriferous gravels. 



Locality. — Mascall beds, Van Horn's ranch, about 12 miles west of 

 Mount Vernon, Grant County, Oregon. Collected 1)}^ Knowlton and 

 Merriam, July, 1901 (U. S. Nat. Mus., No. 8534). 



LiQUIUAMBAIi sp. ? 



PI. XII, tig. 4. 



The collection contains one leaf that apparently belongs to Liquid- 

 amber, but it is much broken, and does not show all the characters. 

 This example, shown in Fl. XII, fig. 4, is a large leaf, five or possibly 

 seven lobed, the lower loljes.l)eing at right angles with the midrib, pro- 

 ducing a novel truncate l)ase. The width between these two lobes is 

 nearly 14 cm. The margin of the lobes is provided with numerous fine 

 teeth. The nervation is well marked, consisting of about five strong 

 ribs, Avhich radiate from the top of the petiole and presumably end 



