302 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.40. 



Referring only to Cretaceous species of Widdringtonites we find four 

 in the Neocomian, one in the Urgonian, one in the Albian, three in 

 the Cenomanian, and one in the Senonian. 



WIDDRINGTONITES RAMOSUS (Fontaine). 



Taxodium (Glyptostrobus) ramosum Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 



1890, p. 251, pi. 123, figs. 2, 3; pi. 124, fig. 2; pi. 127, fig. 1; pi. 166, fig. 1. 

 Glyptostrobus ramosum Ward, Fontaine, in Ward, Monogr. U. S. Geol. Surv., 



vol. 48, 1906, pp. 281 (?), 489, 544. 

 Taxodium (Glyptostrobus) broohense Fontaine, Monogr. U. S. Geol. Surv., vol. 15, 



1890, p. 254, pi. 122, fig. 1; pi. 124, figs. 3-9; pi. 131, fig. 5; pi. 165, figs. 1-3; 



pi. 166, figs. 4, 7; pi. 167, fig. 3. 

 Glyptostrobus brookensis Ward, 15th Ann. Rept. U. S. Geol. Surv., 1895, p. 359. — 



Fontaine in Ward, Monogr. IT. S. Geol. Surv., vol. 48, 1906, pp. 481, 483, 486, 



489, 495, pi. 110, fig. 1 (not pp. 483, 486, 520, which are referred to Arthrotaxopsis 



expansa Fontaine) . 

 Taxodium (Glyptostrobus) broohense angustifolium Fontaine, Monogr. U. S. Geol. 



Surv., vol. 15, 1890, p. 256, pi. 167, fig. 1. 

 Glyptostrobus brookensis angustifolium Knowlton, Bull. U. S. Geol. Surv., vol. 



152, 1898, p. 112.— Fontaine in Ward, Monogr. U. S. Geol. Surv., vol. 48, 



1906, p. 489, pi. 108, fig. 4. 

 Arthrotaxopsis expansa Fontaine, in Ward, Monogr. U. S. Geol. Surv., vol. 48, 



1906, p. 547 (not balance of the original citation). 



Description. — Fontaine's original description in 1890 was as follows: 

 The principal stems seen are moderately stout and very rigid, the secondary ones 

 mostly slender and rigid, the ultimate ones usually very long, slender, and unbranched, 

 wide-spreading, often very delicate and thread-like, going off at an angle of about 45°, 

 but from distortion due to pressure frequently appearing fastigiate and irregularly 

 grouped; leaves on the oldest stems elongate-linear, acute, close appressed, on the 

 younger stems all very narrowly oblong, or narrowly elliptical, acute to obtuse, very 

 closely appressed, not distinctly visible without help of a lens in many cases, all 

 spirally arranged; the facial leaves usually acute, the lateral ones usually more 

 obtuse and sometimes slightly divergent at the tips and incurved; midnerves slender 

 and thread-like. 



Since nowhere in the Potomac group are cones or scales found 

 which indicate the presence of Glyptostrobus, it seems desirable to 

 refer these species and variety of Professor Fontaine's to the genus 

 Widdringtonites because of their extremely close resemblance to Wid- 

 dringtonites rcichii (Ettingshausen) Heer which is so widespread and 

 characteristic a form in the Cenomanian of both the Old and New 

 World. In fact it may be eventually desirable to reduce this Patapsco 

 species to the synonomy of the latter, to which it is at least very 

 closely allied. The variety angustifolium Fontaine is not distin- 

 guishable from the type and is based on specimens slightly more 

 slender than the average, but readily matched in the material which 

 that author refers to the type-species. Glyptostrobus ramosum (Fon- 

 taine) Ward is clearly identical with the other forms which are 

 included by Fontaine in this species and comes from the same out- 

 crops with the exception of certain material from the Kootanie at 



