330 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



3412. Thyrsopteris brevifolia Fontaine. Type. 



Potomac (Low. Cret.). Banks of Dutch Gap Canal, Vir- 

 ginia. 



Fontaine, Hon. XV, U. S. Geol. Sur\\, 1889, p. 121, pi. 24, figs. 



5, 10. 



7335. Thyrsopteris brevifolia Fontaine. Illustrated specimens. 



7336. Lakota (Low. Cret.). Two miles southeast of Barrett, 

 7347. Crook Count}', Wyoming. 



Fontaine, Nineteenth Ann. Rept. U. S. Geol. Sun'., Pt. II, 1899, 

 p. 660, pi. 161, figs. 10-15. 



3413. Thyrsopteris brevipennis Fontaine. Types. 

 3933- Potomac (Low. Cret.). Banks of Dutch Gap Canal ; fish- 

 3936. ing hut above Dutch Gap Canal, Virginia; Baltimore, 



Maryland. 



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, p. 124, pi. 34, fig. 3; 

 pi. 36, fig. 2; pi. 37, figs. 3, 9; pi. 38, fig. i; pi. 41, fig. 4. 



5963. Thyrsopteris brevipennis Fontaine. Illustrated specimen. 



Lakota (Low. Cret. ). South Fork Hay Creek near Barrett, 

 Crook County, Wyoming. 



Fontaine, Nineteenth Ann. Rept. U. S. Geol. Siirv-., Pt. II, 1S99, 

 p. 662, pi. 162, fig. la. 



3224. Thyrsopteris crassinervis Fontaine. Type. 



Potomac (Low. Cret.). Fredericksburg, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Surv , 1889, p. 130, pi. 41, figs. 1-3. 



7352. Thyrsopteris crassinervis Fontaine. Illustrated specimen. 

 Lakota (Low. Cret.). South Fork of Hay Creek near Bar- 

 rett, Crook County, Wyoming. 



Fontaine, Nineteenth Ann. Rept. U. S. Geol. Sur\\, Pt. II, 1899, 

 p. 659, pi. 161, figs. 3,4. 



3385. Thyrsopteris crenata Fontaine. Type. 



Potomac (Low. Cret.). Fredericksburg, Virginia. 



Fontaine, ]Mon. XV, U. S. Geol. Sun\, 1889, p. 127, pi. 39, figs, i, 2. 



2342. Thyrsopteris decurrens Fontaine. Types. 



3774 Potomac (Low. Cret.). Banks of Dutch Gap Canal ; Fred- 



to ericksburg ; 72d mile post near Brooke ; hillside near 



3776, Potomac Run; fishing hut above Dutch Gap Canal, 



3778. Virginia. 



3786. Fontaine, Mon. XV, U. S. Geol. Surv., 1889, p. 130, pi. 43, fig. 7; 



pi. 46, figs. 2, 4; pi. 49; figs. 5-7. 



3183. Thyrsopteris densifolia Fontaine. Type. 



Potomac (Low. Cret.). Fredericksburg; 72d milepost, 

 near Brooke, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, p. 129, pi. 39, fig. 3; 

 pi. 40, figs. 2-5; pi. 41, fig. 5. 



3833. Thyrsopteris dentata Fontaine. Types. 



3190. Potomac (Low. Cret.j. Fredericksburg; hillside near Po- 



tomac Run; banks of Dutch Gap Canal, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, pp. 121-122, pi. 24, figs. 

 4, 6, 7, 9; pi. 25, figs. I, 2. 



