332 BULLETIN 53, UNITED STATES NATIONAL MUSEUM. 



3310. Thyrsopteris meekiana angustiloba Fontaine. Types. 



3941. Potomac (lyOw. Cret.). Baltimore, Maryland; fishing hut 



above Dutch Gap Canal; Fredericksburg; 7 2d milepost, 



near Brooke, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Sur\'., 1889, p. 126, pi. 38, figs. 5-7, 9; 

 pi. 43, fig. 8; pi. 44, fig. 3; pi. 47, fig. 4; pi. 48, fig. i; pi. 54, 

 figs. 2, 11; pi. 55, fig. i; pi. 56, figs. I, 3. 



3241. Thyrsopteris microloba Fontaine. Type. 



Potomac (Low. Cret.). Fishing hut above Dutch Gap 

 Canal, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, p. 140, pi. 57, fig. 4. 



3376. Thyrsopteris microloba alata Fontaine. T3'pe. 



Potomac (L,o\v. Cret.). Fredericksburg; above Dutch Gap 

 Canal; near fi.shing hut, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Sun\, 1889, pp. 140, 141, pi. 55, 

 fig- 5; pl- 58, fig. I. 



3940. Thyrsopteris microphylla Fontaine. Type. 



Potomac (Low. Cret.). Fredericksburg; hillside near 

 Potomac Run, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, pp. 131, 132; pi. 45, 

 figs. I, 2, 4, 5. 



3192. Thyrsopteris nervosa Fontaine. Type. 



Potomac (Low. Cret.). Fredericksburg; hillside near 

 Potomac Run, Virginia. 



Fontaine, Mon, XV, U. S. Geol. Surv., 1889, p. 122, pi. 25, figs. 4, 

 5. 16; pi; 37. figs. 2, 4; pi. 39, fig. 5; pi. 40, fig. 6. 



3345. Thyrsopteris obtusiloba Fontaine. Types. 



3790. Potomac (Low. Cret.). Red clay ball, banks of Dutch Gap 



Canal; hillside near Potomac Run, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, p. 143, pi. 58, figs. 7, 10. 



3976. Thyrsopteris pachyphylla Fontaine. Type. 



Potomac (Low. Cret.). Roadside near Potomac Run, 

 Virginia. 

 Fontaine. Mon. XV, U. S. Geol. Surv., 1889, p. 135, pi. 50, fig. 3. 



3217. Thyrsopteris pachyrachis Fontaine. Type. 



Potomac (Low. Cret.). Frederick.sburg; roadside near 

 Potomac Run; near Telegraph Station; fishing hut 

 above Dutch Gap Canal, Virginia. 



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, pp. 132, 133, pi. 46, 

 figs. 3. 5; Pl- 47. figs. I, 2; pi. 49, fig. I. 



7348. Thyrsopteris pecopteroides Fontaine. Illustrated specimens. 

 Dakota (Low. Cret.). Two miles southeast of Barrett, 

 Crook County, Wyoming. 



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

 p. 661, pi. 162, figs. 16-19. 



3204. Thyrsopteris pinnatifida Fontaine. Type. 



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



Fontaine, Mon. XV, U. S. Geol. Surv., 1889, p. 136, pi. 51, fig. 2; 

 pi. 54, figs. 4, 5. 7; pl. 57. fig. 7- 



