342 



SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY, 1916. 



was apparently broadly ovate, rounded at the 

 base, with the margin strongly undulate- 

 toothed, both the teeth and the sinuses sepa- 

 rating them being rouiided. The secondaries 

 are strong, occasionally forked, approximately 

 parallel, and craspedodrome. Nei-villes rather 

 scattered, somewhat irregular but usually 

 unbroken. Finer nervation producing an uTeg- 

 ularly quadrangular mesh. 



Associated in the same collection is the 

 specimen shown in figure 1, wliich represents 

 the basal portion of a large leaf that is prob- 

 ably the same species as that showni in Plate 

 LXXXIX, figure 3. It is deeply heart-shaped 

 at the base. The midrib is very strong, and 

 the secondaries are at a very low angle. The 

 petiole is preserved for a length of 1.5 centi- 

 meters and is very thick and strong. 



This leaf, which is obviously too much broken 

 to admit of satisfactory diagnosis, appears to 

 be congeneric with Pterospermites undulatus 

 Knowlton,' from Pomt of Rocks, Wyo., but 

 it was much larger and has a more markedly 

 undulate margin. The secondaries appear to 

 emerge from the midrib at a lower angle than 

 in the Point of Rocks form, but this pomt is 

 obscm-e. The finer nervation is about the 

 same in both forms. 



Occurrence: Kirtland shale; 1^ miles north- 

 east of Pina Veta China, San Juan County, 

 N. Mex. Lot 40 (6966). 



FamUy GROSStTLARIACEffi. 

 Ribes neomexicana Knowlton, n. sp. 



Plate LXXXIX, figure 4. 



Leaf small, firm in texture, broader than 

 long, three-lobed, the lateral lobes strongly 

 toothed (central lobe much broken); base 

 truncate or very sliglitly heart-shaped; nerva- 

 tion not well retamed, consistmg at least of a 

 faMy strong midrib and two lateral ribs that 

 arise at or near the base and supply the lateral 

 lobes, each apparently \\ath several branches on 

 the outside that end in the marginal teeth. 



This little leaf, the only one of its kmd in the 

 collections, is broadly ovate in general outline, 

 about 2 centimeters long and nearly 3 centi- 

 meters broad. It appears to be rather deeply 

 three-lobed, and each of the lateral lobes is pro- 



I Knowlton, F. H., U. S. GeoL Survey Bull. l&J, p. 67, pi. 17, fig. 2, 1900. 



vidcd with five or si.x strong pointed teeth. The 

 middle lobe is so much broken that its exact 

 shape can not be made out, though it was 

 doubtless toothed like the others. 



Occurrence: Fruitland formation, 10 miles 

 south of San Juan River and 4 miles east of 

 Chaco River, vSan Juan Coimty, N. Mex. 

 Lot 16 (6958). 



INCERTiE SEDES. 

 Carpites baueri Knowlton, n. sp. 



Plate LXXXVIII, figure 2. 



Fruit spheroidal, about 11 by 13 millimeters 

 in short and long diameter, much compressed; 

 surrounded by an exocarp fully 1 miUuneter 

 thick; "stone" deeply sulcate at one end but 

 not otherwise marked. 



The example figured is the only one found 

 in the collections and consequently its exact 

 character is difficult to determme; in fact, it 

 is impossible to be certain of its orientatioia. 

 The sidcation on one side is probably opposite 

 the pomt of attachment. The nature of the 

 outer covering is difficult to mterpret. It 

 could hardly have been fleshy, as it is so uni- 

 form in thickness and so distinct, and proba- 

 bly it was an exocarp sunUar to that in certain 

 species of Carya. The umer portion, or " shell, ' ' 

 is without markings except the deep furrow on 

 one side. It is perhaps needless to add that 

 its affinity is not known. 



Occurrence: Fruitland formation. Coal Creek, 

 35 mUes south of Farmmgton and 1 mUe 

 east of reservation line, San Juan Coimty, 

 N. Mex. Lot 81 (0955). 



Phyllites petiolatus Knowlton, n. sp. 



Plate XCI, figure 3. 



Leaves small, membranaceous in texture, 

 elliptical-lanceolate, long wedge-shaped at 

 base, apparently narrowly acuminate at apex; 

 margin perfectly entire; petiole very strong, 

 more than 2.5 centimeters in length; midrib 

 very strong below, becoming thin in the upper 

 thu-d of the leaf; secondaries four pairs, alter- 

 nate, at an angle of about 50°, each running 

 up for a long distance and disappearmg in or 

 near the margin or joining the secondary next 

 above; nervdles numerous, very thin, mainly 

 unbroken, at right angles to the secondaries; 

 finer nervation obscure. 



