252 THE POTOMAC OE YOUNGER MESOZOIC.FLOEA. 



figured, but are short and rigid. Some of the ultimate twigs, as those 

 marked 3" and 3^, on PI. CXXIII, are so short and minute that a good lens 

 is needed to make out their details, but the leaves are seen to be sharply 

 defined and very convex. PI. CXXIII, Fig. 3, shows a much-branched 

 twig with very minute and short ultimate branches. PI. CXXII, Fig. 1, 

 shows a tendency to fastigiate grouping of the branches. 



Taxodium (Glyptostrobus) Viroinicum, sp. nov. 



Plat.'CXXI, Fig. a 



Branches slender, going off" at an acute angle ; leaves ver}^ small, with 

 the average dimensions, 1°"" by 4""", narrowly oblong in shape, narrowed 

 to the base and summit, acute, remotely placed; nerves not seen, but 

 apparently single. 



Locality : Hill-side near Potomac Eun ; very rare. 



This plant is nearest to Glyptostrobus Groenlandicus Heer, among de- 

 scribed fossils, but the leaves are much smaller. It is also somewhat like 

 Sequoia fastigiata Heer, but the twigs are not fastigiate. The leaves seem to 

 have been somewhat deciduous, and to have had a mucronate \^^p. 



Taxodium (Glyptostrobus) expansum, sp. nov. 



Pl.-ite CXXIII, Fig. 1. 



Twigs alternate and pinnately arranged, going off" at an angle of 45°, 

 spreading widely, directed slightly upwards, very long and cylindrical in 

 form ; leaves thick and convex, narrowly elliptical or narrowly oblong, 

 proportionally very long and narrow, decurrent, usually close appressed, 

 the lateral ones with their tips sometimes diverging ; nerves not seen. 



Locality : Near Telegraph Station. 



This plant is not uncommon at the locality near Telegrapli Station, 

 and is one of the most abundant conifers at that place. To judge from the 

 specimen figured, the plant must have been wide-spreading, for this is a 

 mere fragment of what must have been a large branch, the basal portion 

 of the ultimate twigs being all that is preserved. The rigid character of 

 the species is well shown in this specimen. The specimen figured is one of 

 those with the stoutest ultimate twigs. Many are more delicate and thread- 



