308 PEOCEEDIKeS OP THE GEOLOGICAL SOCIETY. [May 7, 



ganSj of which it may be regarded as a diminutive Devonian proto- 

 type. 



Its locality is AUen^s quarry, near Oswego, and the formation is 

 the Chemung group. 



7. SiGrLLAEiA SiMPLiciTAs, Yanuxom. 



Yanuxem's ' Eeport Geol. IsTew York/ p. 190, fig. 54. 

 Ligneous surface with narrow, slightly rugose elevated ribs, about a 

 quarter of an inch wide, in a stem Jive inches in diameter. Leaf- 

 scars indistinct. 



Under the above name Yanuxem has figured a Sigillaria, the 

 only specimen of which is a portion of a decorticated stem, with only 

 scarcely distinguishable traces of the leaf-scars. It is from the 

 CatsMll group, between Mount Upton and IST. Bainbridge. 



In Prof. HaU's collection there is a specimen in a similar con- 

 dition, with wider ribs, and which may have belonged to another 

 species, though it is possibly a part of an older stem of the above. 

 It is from the Hamilton group, shore of Lake Erie, near Buffalo*. 



8. STELN-GODENnEON GEACILE, Sp. UOV. PI. XIII. fig. 14. 



Ribs about a line in breadth, with elevated elongated areoles, each with 

 three punctiform vascular scars in a vertical line. Areoles three- 

 eighths of an inch distant vertically . Baric marhed with delicate 

 strice converging toward the areoles. On the inner surface of the barh 

 are fine longitudinal and transverse strice, and the scars appear as 

 elongate depressions. 



This species is described from a small fragment of the bark m a 

 slab from the Hamilton group of Akron, Ohio, in the collection of 

 Prof. HaU. It resembles in some respects S. pachy derma, but is 

 smaller and has thinner bark and more elongated areoles. On the 

 same slab are Oyperites, which may have been the leaves of this plant, 

 fragments of stipes of Ferns, and branchlets of Psilophyton, 



9. Stigmaeia exigtja, sp. nov. PI. XIII. fig. 13. 



Scars small, in depressed spaces, six in an inch vertically. Stem cy- 

 lindrical, an inch in diameter. 



This diminutive Stigmaria was probably the root of one of the 

 slender Sigillaroid trees above described. It is evidently quite di- 

 stinct from Stigmaria minuta, Lesquereux, which is, however, a 

 similar species of nearly as great age. Like many others of the 

 Devonian plants from New York, it occurs in a marine bed ; and the 



^ Some obscurely marked fragments in my collection, from Gaspe and St. 

 John, appear to indicate tlie existence of a species with vsdder ribs than the above. 

 Neither Vannxem's specimens nor these are sufficiently perfect to admit of 

 description ; and the somewhat singular name which I have quoted from him 

 may therefore be taken as representing one or more species of Sigillaria imper- 

 fectly known. 



