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GEOLOGICAL MEMOIRS. 



4. Neuropteris tenuifolia, Schl. sp. 

 Erbignon ; Col de Balme ; Petit-Co3ur. 



5. Neuropteris flexuosa, Sternb.; Brongn., pi. 68. fig. 2. 

 Moutiers. 



Together with the long slender leaflets of the N. flexuosa are im- 

 bedded two larger and broader leaflets, which closely resemble the 

 N. rotundifolia, Brong. But, according to Bunbury, N. flexuosa 

 presents a variety with broad leaflets, from the anthracite of Mar- 

 tigny. Probably the N. rotundifolia which Brongniart found in the 

 Col de Balme and La Roche Macot belongs to the same species. N. 

 flexuosa has a very wide range in the Coal-measures ; and is found 

 in North America, and especially in Pennsylvania, more abundantly 

 than with us. 



(*)6. Neuropteris heterophylla, Sternb. 

 Erbignon, on the same slabs with N. gigantea. 



(*)(f)7. Neuropteris Escheri, Heer. 



Fronde pinnis inferioribus (?) pinnatis, pinnulis oblongis ; pinnis superioribus pin- 

 natis, pinnulis ovatis obtusis pinnati-partitis 3-5 lobis rotundatis, terminal! late- 

 ralibus vix majori. 



Petit-Cceur, on the same slabs with Pecopteris pulchra, Annularia 

 brevifolia, and Asterophyllites. 



On the stone there are three pinnse, which I believe belong to one 

 another, although one in the form of its leaflets differs greatly from 

 both the others. Probably the one was attached higher up the frond, 

 and the other two held a lower position. If this be the case, our 

 species very closely approaches N. heterophylla, where we find both 

 these forms of leaflets on one pinna. However, it differs from it in 

 the pinnules being rather smaller and slenderer, and in the pinnules 

 at the point not being larger than those at the sides. For the same 

 reasons our species cannot be united to N. Soretii, in which, more- 

 over, the pinnules are rather differently formed. The pinnules 

 which I conceive to be the lower ones on the pinna are long ; the 

 pinnules towards the point of the pinna become gradually smaller, 

 and the extreme pinnule is very small, and indistinctly lobed at the 

 base : these pinnules stand pretty far apart, so that their edges do 

 not touch ; they are longish, and obtusely rounded anteriorly and at the 

 base. The venation is very indistinct, but can be made out in some 

 of the leaflets. The midrib is very stout, but loses itself outwards : 

 from it proceed fine side-veins in a somewhat oblique direction, which 

 bifurcate. 



The other pinna, which I believe to have been higher up the frond, 

 has a somewhat curved leaf-stalk with alternating leaflets. They 

 are pinnate, the lower with five, the upper with three lobes which are 

 very obtusely rounded, the outer one being scarcely greater than the 

 rest. The end of the pinna is not preserved. 



