490 THE CARBONIFEROUS SYSTEM. 



somewhat wrinkled at tlie sides, truncated by regularly rhombic 

 scars, each with three approximate vascular points. M. C, Joggins 

 (J. W. D.). 



3. L. parvus, spec. nov. (Fig. 170, G). 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. U. C, Pictou ; M. C, 

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



4. L. platy stigma, spec. nov. (Fig. 170, E). Leaf-bases rhombic, 

 broader than long, little prominent ; scars rhombic, oval, acuminate, 

 slightly emarginate above ; vascular points two, approximate or 

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



5. L. tetragonus, spec. nov. (Fig. 170, D). Leaf-bases square, fur- 

 rowed on the sides ; leaf- scar central, with apparently a single central 

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



Diplotegium, Corda. 

 Diplotegium retusum, spec. nov. (Fig. 172, B). The fragments 

 referable to plants of this genus are imperfect and obscure. The most 

 distinct show leaf-bases ascending obliquely, and terminating by a 

 retuse end with a papilla in the notch. Some less distinct fragments 

 may possibly be imperfectly preserved specimens of Lepidodendron 

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



Knorria. 



Nearly all the plants referred to this genus in the Carboniferous 

 rocks are, as Goeppert has shown, imperfectly preserved stems of 

 Lepidodendron. In the Lower Coal formation many such Knorria 

 forms are afforded by L. corrugatum. 



Knorria Sellonii, Sternberg. This appears different from the 

 ordinary Knorriw ; its supposed leaves may be aerial roots. It has 

 a large pith-cylinder with very distant tabular floors, like Sternbergia. 

 M. C, Sydney (R. Brown). 



Cordaites, Unger. (Pychnophyllum, Brongn.). 



1. Cordaites borassifolia, Corda (Fig. 172, A). M. C, Pictou (H. 

 Poole) ; Grand Lake and Springhill (C. F. Hartt) ; Sydney (R. 

 Brown) ; Joggins, Onslow (J. AV. D.) ; Bay de Chaleur (Logan). 

 Very abundant in the Middle Coal formation. 



2. C. simplex, spec. nov. Leaves similar to the last in size and 

 form, but with simple, equal, parallel nerves. It may be a variety, 

 but is characteristic of the Upper Coal formation. M. C, Grand River 

 (C. F. Hartt) ; U. C, Pictou (J. W. D.). 



