FLORA OF THE CARBONIFEROUS PERIOD. 453 



2. L. prominulus, s. n. 

 M. C. Joggins, J. W. D. 



Leaf-bases rhombic, pyramidal, somewhat wrinkled at the sides^ 

 truueated by regularly rhombic scars, each with three appproxi- 

 mate vascular points. 



3. L. parvus, s. n. 



U. C. Pictou ; M. C. Joggins, J. W. D. ; M. C. Sydney, R. Brown 



Leaf-bases rhombic, small, with rhombic scars broader than 



long, vascular points obscure. Leaves linear, acute, three inches 



or more in length, with a keel and two faint lateral ribs. Cones 



large, sessile. 



4. L. plat y stigma, s. n. 



M. C. Sydney, R. Brown ; Joggins, J. W. D. 



Leaf-bases rhombic, broader than long, little prominent. Scars 

 rhombic, oval, acuminate, slightly emarginate above, vascular 

 points two, approximate or confluent. 



5. L. tetragonus, s. n. 

 M. C. Joggins, J. W. JJ. 



Leaf-bases square, furrowed on the sides. Leaf scar central 

 with apparently a single central vascular point. 

 Diplotegium, Corda. 



Diplotegium retusum, s. n. 



M. C. Joggins, J. W. D. 



The fragments referrible to plants of this genus are imperfect 

 and obscure. The most distinct show leaf bases ascending ob- 

 liquely, and terminating by a retuse end with a papilla in the 

 notch. Some less distinct fragments may possibly be imperfect- 

 ly preserved specimens of Lepidodendron or Lepidophloios. 

 Knorria. 



Nearly all the plants referred to this genus, in the carboni- 

 ferous rocks are, as Gosppert has shown, imperfectly preserved 

 stems of Lepidodendron. In the Lower coal formation many such 

 knorria forms are afforded by L. corrugatum. ■ 



Knorria Sellonii, Sternberg. 



M. C. Sydney, R. Brown. 



This appears different from the ordinary Knorrice, Its sup- 

 posed leaves may be aerial roots. It has a large pith cylinder with 

 very distant tabular floors like Sternbergia. 



Cordaites, Unger, (Pycnopliyllum, Brongt.) 



1. Cordaites borassifolia, Corda. 



M. C. Pictou, H. Poole ; Grand L., C. F. Hartt, ; Sydney, R. 



