23 
2. Steophomenes rhomboidalis^ JFilckens. 
Conchita rhonihoidalis, Wilckeus, 1769, Nadir, v. Selteueu Verstelu , p. 77, pi. 8, fig. 43,44. 
Strophomenes riigosa, Eafiuesque, 1820. 
Strophomena rlioinboidalis, T. Davidson, 1871, Mon. Brit. Sil. Brach., p. 281, pi. 39, 
fig. 1-21.' 
It appears useless to me to dilate, in this work, upon tlie specific 
characters of this shell, which is so well-known and wide-spread throughout 
Palaeozoic rocks. I will confine myself to saying, what appears to he almost 
generally admitted, that it served Hafinesque as a type for the genus 
Strophomenes, the last syllable of which has been wrongly altered. It is 
likely that this change is due to the rarity of the works of this Author, of 
which a part were published in loose pages, which in consequence leads to the 
difficulty of consulting them and controlling the original spelling of the name. 
Horizon and Locality. — This species, which in Europe appears to pass 
from the Caradoc, through the Llandovery, Ludlow, and the Devonian up to 
the Lower Carboniferous beds, is very rare in the Upper Silurian of Australia. 
Mr. Clarke has sent me a single specimen in the condition of an internal cast 
in a brownish shale from Lock Elat Creek. 
3. Strophomenes filosa (?), J. de C. Sowerhy. 
Orthis Jilosa, J. de C. Sowerby, 1839, in Murchison’s Silurian System, pi. 13, fig. 12. 
Strophomena Jilosa, Salter, 1848, Mem. Geol. Survey Gt. Britain, II, p. 380. 
„ ,, Idem, 1859, in Murchison’s Siluria, pi. 20, fig. 2. 
„ „ Davidson, 1871, Mon. Brit. Sil. Brach., p. 307, pi. 44, fig. 14-20. 
As I have before me only one badly preserved specimen, it is impossible 
to assert that it agrees exactly with the species under whose name I have 
placed it ; hut as, on the other hand, I have found no other Strophomenes 
with which it agrees more closely in its characters, I feel justified in giving it 
this name provisionally. In any case it cannot he confused with Strophomenes 
pectcn, from which it differs in the form of its ribs and cardinal process, and 
in the muscular impressions which are much more developed. 
Horizon and Locality . — The specimen I have just mentioned occurs 
in an olive-grey shale, which contains internal casts only. It has l)een 
collected on the hanks of the Murrumhidgee, near Yass, 
For Synonymy see Davidson’s Monograph. 
