720 APPENDIX L 
to one inch; and on close examination it is found that a carbonaceous film here inter- 
sects the stem (or one half of it) extending into the clay beneath, and causes the appear- 
ance of fracture. Besides, the stem is angularly depressed at intervals, along the centre. 
In figure V the stem looks as if crumpled into a series of large angular depressions. 
The name Clasteria (from xAa¢ros, broken) alludes to this broken appearance. 
It is especially remarkable that the stem which has the form in figure 3 at one extre- 
mity, gradually changes to V and then IV, figure 4, showing that although so different, 
all these forms are parts of one and the same individual. The impressions are very 
thin, as in the Phillotheca. The idea of their having some connexion with seed- 
bearing vessels or pods is suggested by the form, but no analogy can be appealed to by 
the writer to sustain it. 
ANARTHROCANNA AUSTRALIS (Dana).—On plate 14, figure 13, there is represented a 
linear leaf, (6 inches long,) half an inch broad, having a faintly striated surface. It 
appears to pertain to the genus Anarthrocanna of Goeppert, as published in Tchihatcheff’s 
L’Altai Oriental, p. 379, Appendix. 
Figure 6 a, plate 14, represents a plant from the Illawarra coal beds, which is of un- 
certain relations. It is represented with the same indistinctness and want of details that 
appear in the specimen. It has a coaly aspect without any regular texture apparent to 
the naked eye, and seems to have been a thick membranous or woody plant, with oppo- 
site branches at intervals of about four inches. 
CysrosrrrirEs !—At 6, on the same figure, there is a Fucoid plant of singular cha- 
racter. It has some resemblance to a fragment from the fossil called Cystosezrites 
nutans, by Sternberg, (flora der Vorwelt, v. and vi. tf. 18, figs. 1-3; Bronn’s Lethea 
Geognostica, p. 223, pl. 14, fig. 8.) 
AUSTRELLA RIGIDA (Dana).—Plate 14, figures 7, 8. A plant having the stems 
rigid, evenly narrow linear, and branching at intervals, with the angle at the axil 60° to 
70°, and the branches like the main stem in characters and size. The specimen in 
figure 8 is only z of a line broad, and shows no appearance of a midrib. Figure 7 6, 
appears to be the same plant a line broad. From Newcastle. 
ConFERVITES? TENELLA (Dana).—Plate 14, figure 9, represents another doubtful 
plant. It is in long linear threads of varying breadth, and flexed irregularly arising 
from its flexible character. It is occasionally branched. The breadth is about 7 of a 
line. Common at Newcastle. It is an extremely thin fossil. 
II. FOSSILS FROM TIERRA DEL FUEGO AND PERU. 
1. Fossils from Tierra del Fuego. 
The following fossil is the only one obtained during the few hours ashore in the vici- 
nity of Nassau Bay, Tierra del Fuego. It is allied to the Belemnite, but from certain 
peculiarities constitutes properly a new genus. 
Genus HELICERUS (Dana).—Near Belemnites. Ossicle calcareous, thick sub- 
cylindrical, containing internally a slender tubular cavity, (a continuation probably of an 
alveolus above,) which terminates below in a fusiform chamber helicoidly divided. 
HELICERUS FUEGIENSIS.—Plate 15, fig. 1 a, section of part of ossicle exposing the 
