102 
brevissima tcrminatis ; foliis minutis, squamseformibus, ovato-oblongis ; 
nervatione phyllodii compositi craspedodroma ; neryo primario (s. axi phyllodii 
primarii) distincto recto excurrente ; nervis secundariis sub angulo acutissimo 
egredientibus, simplicibus, apicem loborum attingentibus. 
Obs. — We have here a phyllodium, which reminds us much of 
Thyllocladus. But there are so many peculiarities respecting formation and 
form of the phyllodium, as well as the arrangement of leaves, that we have 
been compelled to suppose here the existence of a separate genus. In 
Thyllocladus the secondary branchlets only are phyllodineous-formed. The 
phyllodia, unpetiolate, or in connection with the primary branchlets by 
a short petiole, are there pinnately divided or lobed, and the lobes mostly 
toothed. The leaves there are small, tender, scale-like, placed in a spiral 
order or singly near the base of the verticillate primary branchlets. In 
Tahcocladus, however, the primary branchlets are phyllodineous, and the 
secondary ones are reduced to simple and entire lobes. Here we have, 
accordingly, the remarkable fact of the connection of all phyllodia together. 
The leaves, though very small, betray a coriaceous texture, and exhibit at the 
base of the primary phyllodium a distichous order. 
The branchlet before us, Tig. 33, presents a phyllodium, on the top of 
which a second smaller phyllodium is developed, a feature which is wanting 
in Thyllocladus , as the phyllodia in this bear no terminal bud. 
Besides these very remarkable characters, forcing a separation of the 
genus Thyllocladus, the following should be distinguished : — The primary 
phyllodium is elongate-cuneate ; its primary nerve is tolerably thick, straight, 
gaining the top ; the second phyllodia, only represented by lobes, are ovate, 
narrowed to the base or broad-ovate, and acute. The apex of the lobes is 
marked with a very small spinula (see Tig. 33 a, magnified), but not preserved 
on every lobe. The nerves of the lobes, or the secondary nerves of the com- 
pound phyllodium, spring from under very acute angles, and reach the apex 
of the lobes undivided. The scale-like leaves, only preserved on the larger 
phyllodium, arc somewhat thick and oval-oblong. The upper phyllodium 
shows at its base some traces of such leaves, equal in form, size, and order, 
and seen in our figure. 
According to its more simple characters, the genus Talccocladus may 
be considered tbc ancestor of Thyllocladus. 
Locality and Horizon . — Old Bose Valley Lead, with preceding. 
