DESCRIPTION OF TIIH SI'ECIES. 141 



nic'liis, and in the i)ro[)orti(>nally larger size of the pinnules and l(>l»es. 

 I'l. LV, Fig. ;'), appears to represent the upper portion of a compound 

 pinna, corres})onding' to the upper portion of the fragment represented in 

 PI. liVII, Fig. 4, where the pinnules are reduced to lobes and the ultimate 

 pinna' to })innules. 



Localities: Fredericksburg; above Dutch (laj) Canal, near the fish- 

 ing-hut. 



The plant is not common anywhere, but is most abumlant in thin 

 sliale partings in the bank a little above the spot at the fishing-hut, where 

 so many plants were collected. It does not occur, strange to say, at this 

 last-named sjjot, which is only a few yards di.stant. The fine specimen, 

 1*1. LV, Fig. 5, was found at the L)utch Gap locality. 



TlIVRSOPTERIS NANA, sp. nov. 

 Plate LVI. Figs. 4, 8. 



Frond very small, ti'ipinnate; rachises slender; ultimate lower pinna; 

 or pinnules very minute, short, rather remotely placed, much narrowed at 

 the base, subrhoudjic in shape, cut very obli([uely nearly to the midnerve 

 into verv small elliptical or oblong pinnules or lobes, which are mostly 

 obtusely rounded at the ends, rareh' subacute, the lower ones diverging 

 considerably; the ultimate pinniu terminate in a three-lobed .segment; the 

 ultimate pinna' pass towards the ends of the penultimate pinna' and of 

 the principal pinna) into pinnules, which have a wedge-shaped base, and 

 are cut deej)ly into three lobes, the lower pair diverging strongly ; nerves 

 of the pinnules and lobes fine but distinct, closely placed, those of the 

 ])inuules in the lower portion of the pinna' fiabellately di%'erging from a 

 short Ijasal nerve, mostly simple in the lobes, once or twice forking, and 

 without the basal nerve. 



J-iOcalities : Fredericksljurg ; fishing-hut above Dutch Gap Canal; 

 quite rare. 



This is a very small plant, which seems quite distinct from all other 

 described fossils. 



