432 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



30. Lepidodendron ? tumidum (n. sp.). 



A large species, allied to L. Ottonis of Goeppert*, witli remark- 

 ably large leaf-scars, which are of an unequally hexagonal form, 

 transversely elongated, with the two lateral angles much extended, 

 the two upper obtuse, and the lower rounded off. In the middle of 

 each leaf-scar are two vascular points, placed close together, and often 

 confluent, and two others above and outside of these. There are no 

 distinctly limited areolae as in the typical Lepidodendra, but the wide 

 spaces between the leaf-scars are elevated, and as it were puffed up, 

 and marked with numerous, rather irregular, wavy, longitudinal striae. 

 A well-marked ftirrow runs down some way, in a curved direction, 

 from each of the lateral angles of every leaf-scar. 



This is one of those ambiguous forms which would be referred by 

 some to Lepidodendron, and by others to Sigillaria. It has some 

 resemblance to Sigillaria Brardii, Brongn.f , but the leaf-scars in that 

 plant seem to be much more closely placed, and seated on distinct 

 and regular elevations {inamelons), which are separated by well-marked 

 furrows crossing one another at acute angles, so as to give a tessel- 

 lated appearance to the whole surface of the stem. To Lepidoden- 

 dron Ottonis^ Goepp., our plant approaches much more nearly, and 

 seems to be distinguished from it chiefly by the much more distantly- 

 placed leaf-scars, and by the intervals between them being more 

 swollen and distinctly striated. 



31. Lepidostrobus? trigonolepis (n. sp.). 



I am in some doubt whether this is really a cone, or a young leafy 

 shoot of some large and robust species (di Lepidodendron ; but at any 

 rate it seems distinctly different from anything that I can find de- 

 scribed. The most perfect specimen of it is about 2\ inches long, 

 rather thick in proportion to its length, nearly cylindrical, rounded at 

 the end, and composed of closely-imbricated leaves or scales, which 

 are of a broad triangular forai, acute, slightly convex, apparently of 

 a very rigid texture, and rather obscurely keeled. They seem to be 

 attached to the axis by a very short claw. 



32. Sigillaria elongata, Bronyn. 



A decorticated specimen, but apparently referable to this species. 



33. Sigillaria reniformis, Brongn. 



34. Sigillaria? 



The genus of this is very doubtful. All the specimens are decor- 

 ticated : they have at first sight much the appearance of the large 

 broad-ribbed Sigillarice, such as reniformis, but the vascular scars, 

 instead of being arranged in single vertical rows between the furrows, 

 are placed in a quincuncial order, or in spiral lines, like the scars of 

 Stigmaria. The furrows, too, are not equidistant nor uniformly con- 



* Syst. Fil. Foss. t. 42. f.'2, 3. 



t Hist. Veg. Foss. vol. 1; p. 430. t, 158. f, 4. 



