Tertiary. | PALZONTOLOGY OF VICTORIA. { Echinodermata. 
Var. B.—With 6 to 15 tubercles on posterior lateral interambulacra in 8 or 4 
rows. Length, 1 inch 2 lines; proportional greatest width, ,°,°,; from posterior end 
to apex, 735 to 35%; depth, 34%; posterior ambulacra, length +4°,, width 13, to 745, 
REFERENCE.— Spatangus (Forbes), Lectures on Gold, p. 50, 1852; Spatan- 
gus Forbesi and Hemipatagus Forbesi (McCoy MSS.); Lovenia Forbesi (Duncan), 
Geol. Jour. 1877, t. 4, figs. 5 to 8. 
I find that it is impossible to divide this species into two, as sug- 
gested by Mr. Etheridge, jun. (L. Woodsi and L. Forbesi), from 
the number of primary tubercles in the posterior lateral interambu- 
lacra, although I notice that those with the more numerous tubercles 
are more common in the Murray cliffs and more rare near Mel- 
bourne, and that they are less pentagonal from a slightly greater 
proportional length and less protuberant sides, and have the apex 
usually farther from the posterior end, and the posterior ridge 
stronger. After noting hundreds of specimens I find with Prof. 
Duncan that the variations in any one of these points and in the 
slope of the anterior profile exceed the difference, and there is no 
connection between them ; the same may be said of his var. minor. 
I first named this species after Prof. Forbes in MSS. labels of 
the fossils collected by the Geological Survey of Victoria shortly 
after arriving in the colony nearly 20 years ago, and the specimens 
so labelled were from that day to this publicly exhibited in the 
National Museum at Melbourne. Specimens with this specific 
name, and my own as authority, were then sent home with Victorian 
collections to the different International Exhibitions held in London 
and Paris, and distributed thereafter to various European public 
museums. So, lest it might be thought that I had taken credit to 
myself in those early days for a discovery and specific name of any 
other observer, I think it best to continue to use my own name as 
the original authority for the species, to which I gave the name of 
my old colleague Prof. Forbes, because he was the first to figure it, 
from Melbourne specimens, in his ‘ Lectures on our Knowledge of 
Australian Rocks as derived from their Organic Remains,” p. 50, 
published in 1852,* but which no other subsequent writer seems to 
have noted. Prof. Forbes only named it ‘“ Spatangus,” without 
giving any description or specific name. Since then numerous 
*“Tectures on Gold,” &c., delivered at the Museum of Practical Geology. London: D. 
Bogue. 1852, 
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