82 Safari . — On an Australian Specimen of Clepsydropsis. 
the Mt. Tangorin fossil. On the advice of Professor Seward a brief descrip- 
tion of the Mt. Tangorin specimen, accompanied by a few rough figures, 
was sent to Mrs. Osborn for comparison ; in her answer (received in 
September 1917) she states that there is no doubt as to the specific 
identity of the two, and proposes the name Ankyropteris australis (see, 
however, pp. 83-4, below). Two valuable features about the Barraba fossil 
are, firstly, that the stem is preserved, and, secondly, that the origin of the 
leaf-trace is visible. The Mt. Tangorin specimen, on the other hand, which 
does not include the stem, and is on the whole not well preserved, contains 
portions of the petioles slightly more distal than those in the Barraba fossil, 
and in the further branching of the petiolar trace to a very small extent 
appears to supplement the structures preserved in the latter. 
I am very grateful to Mrs. Osborn for the great kindness she has shown 
me in comparing my description and in so willingly supplying me with un- 
published details about her own fossil, which have been of much help and 
interest. It is also my pleasant duty to express my heart-felt thanks to 
Professor Seward, who was kind enough to entrust the work to me, and who 
has been a constant source of help and encouragement. The work was 
carried out during the tenure of a Research Studentship at Emmanuel 
College, Cambridge, and latterly also of a Grant from the Dixon Fund 
of the University of London. 
II. Review of Previous Literature. 
The name Clepsydropsis , which has reference to the cross-section of the 
petiolar trace, was first used by Unger in 1854, 1 but it was not until two 
years later 2 that he published a diagnosis of the genus, placing it in Corda’s 3 
family Rachiopterideae, and described (provisionally as three distinct 
species, C. antiqua , robusta , composita) some fern-petioles from the Cyprid 
Schists in the Upper Devonian (Lower Culm) of Saalfeld in Thuringia. 
Unger’s originals have since been several times re-examined, and from 
Solms-Laubach’s 4 work (1896), as well as from a more recent paper 5 by 
Dr. Paul Bertrand, it appears that the two last-named species were founded 
upon deformed specimens of C . antiqua , Ung. In 1889 Stenzel 6 described 
another species, Asterochlaena ( Clepsydropsis ) kirgisica , Stenz., from the 
vicinity of Pawlodar, north of Semipalatinsk in Western Siberia, about the 
horizon of which we have no certain data. The fossil was discovered as 
a pebble in an alluvium overlying coal-bearing strata, and was considered to 
be of Lower Permian (Rothliegende) age, 7 but this is by no means free 
from doubt. 8 The original of Stenzel’s Fig. 38, PI. IV, collected by Aberg 
1 Unger (1854), p. 599. 2 Unger (1856), p. 165. 
3 Corda (1845). 4 Solms (1896), pp. 25-7. 
5 Bertrand (1911 a), p. 4. 6 Stenzel (1889). 
7 Stenzel (1889), p. 20. 
8 Solms (1910), p. 542. See also Goeppert u. Stenzel (1881), p. 16. 
