45 
E. globosum, Dana, E. sacculus, Dana, and E. corclatum, Dana, are “ typical 
Heteromyarians ” — presumably these are the Eurydesma referable to 
Leiomyalina. 
1892 . — Eurydesma was recorded from the Permo-Carboniferous of the 
Yatton Gold-field, Queensland^ — E. cor data was recognised, and possibly 
E. sacculus also. 
1901 . — P, Noetling, in an article on the Stratigraphical Geology of the 
Salt Range, places the zone of Eurydesma globosum, Dana, as interpreted by 
Waagen, in the Middle Rothliegende (Upper Permian).^ 
1902 . — Dr. J. Tschernyschew mentioned the occurreneeof E. globosum 
in the Middle Carboniferous of the Ural.^ 
1902 . — The description and illustrations of the Berlin specimen of 
Leiomyalina, Freeh, were supplemented by figures of other examples 
preserved in the Hamburg Museum^ from the Dyas (Permian) of Tasmania. 
In addition to the characters given in the previous paper, and which serve to 
separate from Myalina, De Kon., others are added — a single very 
strong cardinal tooth in each valve, and a “ suspicion ” of a posterior lateral 
tooth. Freeh next accepts E. cordatum, Morris, as the type of Eurydesma, 
and whilst recognising Morris’ figures of the latter as the best hitherto 
published, remarks that they exhibit neitlier the smooth surface, nor a 
suggestion of the posterior lateral tooth, modifying this statement by “ it is 
not at all improbable that the absence of these important distinctive features 
is owing to the defective preservation of the original specimens.” In view of 
this, it is hard to see how Leiomyalina differs from Eurydesma. 
Freeh also gives his views as to the relationship of certain characteristic 
Australian ^’ermo-Carboniferous shells to Leiomyalina. and these are referred 
to, though it is not proposed to enter into further criticism at present : — 
(1) Aphanaia, De Koninck,® is said to be closely related to LHomy alina, 
and is also an abundant genus. 
' Etheridge —Geol. Pal. Q’land, 1892, p.'277. 
2 Noetling— N. Jahrb. Min., Beil.-Bd., XIV, 1901, p. 431. 
^ Tschernyschew — M6m. Com. G4ol. Russie, 1902, XVI, No. 2, p. 727. 
* Freeh in Roeiner — Leth. Pal., 1902, II, Lief. 4, p. 600, fig. a. 
* De Koninck— Foss. Pal. Nouv. Galles dii Sud, 1877, Pt. 3, p. 164. 
