1865.] DAWSON COAL-rOEMATIOX. l&l 



imperfect specimens might be mistaken. It is also near to L, hinerve 

 and L.patulum, Bunbury*. It abounds in the Middle Coal-measures. 

 M. C, Sydney (E. Brown) ; Pictou (E.Poole and J. W.D.) ; Grand 

 Tudke{C.F.Hartt). 



3. L. EnrosuM, Sternberg. 



M. C, Sydney {B, Brown) ; Joggins (J. W. D.) . 



4. L. DiCHOTOMUM, Sternberg (L. Sternhergii, L. & H.). 



M. C, Sydney {E. Brown) ; Joggins {J, W. D.) ; L. C, Horton, 

 {J.W.D.). 



5. L. DECUETATUM, spcc. nov. PI. IX. fig. 40. 



Areoles approximate or separated by a shallow furrow, rhombic 

 ovate, obliquely acuminate below, nearly as broad as long, wrinkled 

 transversely, especially on the middle line, which appears tuber- 

 culated ; vascular scar rhombic, twice as broad as long, with three 

 approximate vascular points. In some flattened specimens the line 

 separating the areoles is indistinct, and the scars appear on a trans- 

 versely wrinkled surface without distinct areoles. 



M.C., Pictou (J". W.D.). 



6. L. TJNDiJLATUM, Sternberg. PI. IX". fig. 41. 



Possibly several species are included under this name ; but they 

 cannot be separated at present. 



M. C, Sydney {R, Brown) ; Joggins and Pictou (J". IF. D.) ; F. C, 

 Joggins {J, W, D.), 



7. L. DiLATATUM, Liudlcy & Hutton. 

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



8. L., sp. like tetragonijm, Goepp. 



Obscurely marked, but a distinct species, unless an imperfectly 

 preserved variety of L. tetragonum. The areoles are square, with a 

 rhombic scar at the upper corner of each. 



L.C.,Horton(j: W.D.). 



9. L. BiifERVE, Bunbury. 



M. C, Sydney (B. Brown), 



10. L. TUMiDUM, Bunbury, 



I think it probable that this species belongs to the genus Lepido^ 

 pMoios ; but I have not seen a specimen. 

 M. C, Sydney (B. Brown) . 



11. L. aRACiLE, Brongn. 



In Brown's list in ' Ac. Geology.' Probably a variety of the next. 

 M. C, Sydney (B. Brown). 



12. L. ELEGANS, Brongn. 



In Bunbury and Brown's lists. 

 M. C, Sydney (B. Brown), 



* In certain states of preservation, the lateral ribs of the leaves become obso- 

 lete ; and in others the central disappears, in which state the resemblance to L. 

 hinerve is very close. 



