TO JUNCTION OF GRAND AND GKEEN KlVEItS. 147 



Los Bronces coal, as the two species of Camptopteris C. serrata and C. (fuertifolia 

 are both from the Upper Trias of Bayrenth. 



The collection of Mr. Reniond contains a large number of specimens of Caniji- 

 foptcris, although these are very much broken up ; two of the more complete are 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.ENIOPTKRIS KLEGANS, Newb. 

 Plate VIII, fig. 1. 



Frond 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 fern will be distinguished at a glance from any of its associates by its 

 remarkably strong and clear '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 great group of the Tfcnioptcridfe, there is none, so far as I know, which 

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



Formation and locality. Triassic beds of Los Bronces, Mexico. 



TYENIOPTEKIS GLOSSOPTEROIUES, Newb. 



Plato VIII, tigs. 2, 2". 



I'Yond 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, and more or less inosculating above to form 

 elongated and irregular meshes. 



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

 Tfeniopteris marantacea, so common in the Trias of Kurope; but in that species the frond 

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

 our 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 summit of the frond; fig. 2 a the base. 



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



TJENIOPTERIS MAGNIFOLIA, Rogers. 



Plate VIII, figs. 3, 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 



