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GEOLOGICAL MEMOIRS. 



entire leaflets, and should be placed among those next to P. Jaegeri, 

 G6p., from the coal of Waldenberg ; from which it differs, however, 

 by the leaflets being longer and more distant. 



21. Sigillaria, sp. 



Merian found a large fragment of a stem at Erbignon. Brongniart 

 mentions eight or nine species from the Tarentaise, and among them 

 S. Brardii, S. tessellata, and S. notata. 



(*)22. Lepidophyllum lanceolatum, Brongn. ? 

 Petit-Cceur. 



A large, long, lanceolate, entire-edged leaf, gradually narrowing 

 outwardly and divided by a strong longitudinal rib. I saw several 

 specimens, but none with the base and extremity preserved, so that 

 it could not be identified with certainty. 



(*)23. Lepidophyllum caricinum, Heer. 



Petit-Cceur ; on the same stone with Neuropteris Escheri. 



A long, rigid, straight leaf, of uniform breadth (1^'"), with a very 

 strong keel-shaped midrib, besides which no longitudinal ribs can be 

 detected. It resembles the leaf of a Carex, but probably may be re- 

 ferred to some species of Lepidodendron, which sometimes have these 

 long slender leaves. It further resembles Lepidodendron in its rigid 

 appearance. 



Very like Lepidophyllum lineare (Poacites carinata), Brongn. 

 (Mem. du Museum, t. viii. t. 14. f. 2), but the leaf is only half as 

 wide, and there are no other ribs besides the stout midrib. 



(Aus.) 24. Calamites Cistii, Brongn. 

 La Mure ; small fragment of stem. 



(*)25. Calamites undulatus, Sternb. 



La Mure. 



A large, decorticated fragment of stem. The length of the joints 

 of the stem amounts to one-third the diameter. The striae were in 

 wavy lines ; they are feebly arched, and here and there marked with 

 transverse lines. No papillae can be traced. The articulations ap- 

 pear as deep transverse furrows. 



It agrees with C. undulatus in its wavy striae and the form of 

 its ribs ; the ribs, however, are somewhat slenderer, and the joints 

 shorter. Still, as the closely allied C. Suckovii, Brongn., has some- 

 times shorter and sometimes longer joints, this is no ground for sepa- 

 rating it from C. undulatus. From C. Cistii it is distinguished not 

 only by the shorter joints, but by the much greater breadth of the 

 ribs and their undulating lines, in which, as well as in the length of 

 the joints, it also is distinguishable from C. approximates, Schlot. 



