FOSSIL PLANTS. 445 



GENUS KNORRIA, Sternb. and Gopp. 



Cicatrices half cylindrical, obtuse at the point, more or less enlarged down- 

 wards, like those which are indicated as the essential character of this genus, 

 have been recognized as subcortical scars of some species of Lepidodendron by 

 Prof. Goppert and other recent authors. We have seen the same also in our 

 Lepidodendron Morrisianum, and in this Report still a specimen referable to 

 Sigillaria monostigma, Lesqx., is figured, and bears the caudal intumescence of 

 a Knorria. We have, therefore, abstained from describing any new species as 

 referable to this genus, though we have in our Coal Measures the two species 

 admitted to it by Goldenberg : Knorria imbricata, Sternb., mentioned in vol. 

 ii, of this Report, and Knorria Selloni, Sternb., Vers., i, iv., p. 37, pi. 57, 

 from the shales at Morris. 



GENUS SIGILLAHIA, Brgt. 



111. Geol. Rep., ii, p. 448. 



SIGILLARIA CORRUGATA, Sp. nov. 



PL xxiv, fig. 4, and PL xxv, fig. 5. 



CORTEX very rugose or deeply wrinkled in the length, 

 marked by linear-oval, elongated cicatrices, gibbous in the 

 middle and cut by a round angular scar, as seen pi. xxv, fig. 

 5. Lower surface also wrinkled lengthwise with smooth, shal- 

 low strise, marked by cicatrices, oval in outline or somewhat 

 pointed at the top, rounded in its lower part, marked in the 

 middle by three irregular, vascular scars, placed in the shape 

 of a horse-shoe, or by a semi-lunar scar which points down- 

 wards, and a mere vascular point underneath. These cica- 

 trices are one inch long, half an inch broad, distant, and placed 

 in quaternate order. 



This species resembles a Lepidodendron, appearing related to L. punctatum, 

 Sternb., which Prof. Brongniart considers a Sigillaria. Its leaf scars have 

 more analogy to those of the last genus. 



Found at Marseilles, LaSalle Co., at the base of the thick bank of sandstone 

 which there appears to take the place of the lower coal strata, and which gen- 

 erally contains remains of large species of plants, rarely in a good state of pre- 

 servation. 



