TO JUNCTION OF GRAND AND GREEN KIVER8. 147 



Uos Bronces coal, as the two species of Gamptoptens—G. serrate and C. quercifolia— 

 are both from the'Upper Trias of Bayreuth. 



ine collection oi Mr. Remond contains a large number of specimens of Gamp- 

 typteris, although these are very much broken up; two of the more complete arc now 

 figured. These show the form of the radiate, almost peltate frond, the character of the 

 margins, and nervation of the pinnae. 



Formation and locality.— Triassic strata; Los Bronces, Sonora, Mexico. 



T.ENlol'TKRIS ELEGANS, Xewb. 

 Plate VIII,fig! 1. 

 rrond broadly spatulate or elliptical in outline; median nerve prominent and 



roughened; lateral nerves remarkably strong, uniform, parallel, simple, issuing from 

 the median nerve at an acute angle. They are straight below, but near the summit 



of the frond are gently arched upward. 



This tern will be distinguished at a glance from any of its associates by its 

 remarkably strong and (dear nervation. Fragments only of the frond are contained 

 in the collection, so that we are unable to indicate its exact form ; but the portions 



seen lead to the inference that when complete it was broadly spatulate or elliptical. 



Among all the greal group of the Taniopterida, there is none, so far as I know, which 

 has a nervation so distinctly-marked and exact as this one. 



Formation and focality.— Triassic beds of Los Bronces, Mexico. 



T.KMoi'TEKis GLOSSOPTEEOIDES, Xewb. 

 Plate Vlll, figs. 2, 2«. 



Frond simple, spatulate in outline, one foot or more in length, two inches in 

 width at the broadest part The base is long-wedge-shaped. The median nerve is 

 very strong and smooth ; the lateral nerves relatively sparse and distinct, given off at 

 an acute angle, dividing near the base, ami more or less inosculating above to form 

 elongated and irregular meshes. 



In their general aspect, the fronds of this fern bear considerable resemblance to 

 'Rmiopteris marantacea, so common in the Trias of Europe; but in that species the frond 

 is supposed to be pinnate, while in this it is unquestionably simple. The nerves in 

 OUT plant are also finer and anastomose much more frequently. It seems to me, how- 

 ever, that we have not sufficient ground for separating these plants generically, and I, 

 therefore, for the present, consider them simply as distinct species of the same genus. 

 Of the figures now published, fig. 2 represents the summitofthe frond; fig. 2 a the base. 



Formation and locality. — Triassic strata of Los Bronces, Sonora, Mexico. 



TvENIOPTEKIS MAGNIFOLIA, Rogers. 

 Plate VIII, 6gs. :?, 4. 



This species is abundantly represented in the collection made at Los Bronces by 

 Mr. Remond, and is perhaps the most important connecting link between the Triassic 

 beds of Sonora and those of North Carolina and Virginia. It may be recognized at 



