Tertiary. | PALZONTOLOGY OF VICTORIA. [ Mollusca. 
the Coralline Crag of Suffolk ; the Australian ones agreeing perfectly 
in this as in every other character with the specimens from the 
Miocene Faluns of Flonheim near Alzey, Rheinhessen. The number 
and proportion of the teeth and other internal characters of the 
hinge, broad, smooth, bevelled margin, &c., are identical in the 
English Crag, the German Miocene, and the Australian examples. 
I think it right to remark that I assert the identity of the Australian 
and European Miocene species only after a minute comparison of 
specimens from the different localities, and that I have no doubt of 
the identification. I have placed English and German specimens 
in the Melbourne Museum for comparison. This identification is 
the more remarkable from Mr. Jeffries having lately (Ann. & Mag. 
N. H. Nov. 1862) dredged a shell which he identities with this 
species from a depth of 85 fathoms in Shetland, and there is no 
parallel example known of a North Sea shell in Australian rocks ; 
I can only vouch myself for the identity of the Australian and 
European Tertiary fossils.* 
The concentric ridges being stronger than the longitudinal ones, 
and interrupting them, as well as the greater convexity and 
differences of proportional measurements, easily distinguish this 
species from the L. Belcheri, the only other species of the genus 
hitherto found in Victorian rocks. 
Abundant in the bed of blue marl with Septaria (marked E in 
Geol. Survey Section) at Bird-Rock Point, near mouth of Spring 
Creek, 15 miles 8. of Geelong (part of A‘ 24 and A‘ 21). Very 
rare and of small size in the clays of A’ 16. Not uncommon, of 
small size, in the sandy marls of A‘ 8. Very common in junction 
beds at Bird Rock (A* 22). Very common in brown sandstone beds 
at Bird Rock (A* 23). Not uncommon in Oligocene sandy clays 
between Mount Eliza and Mount Martha, at Mornington. 
EXPLANATION OF FIGURES. 
Plate XTX.—Fig. 5, natural size of average specimen, left valve. Fig. 5a, portion of hinge 
magnified to show the triangular cartilage pit. Fig. 6, more oblique larger specimen of right 
valve, natural size. Figs. 6a and 64, portions of surface in different states magnified. Fig. 7, 
inside view of average specimen. 
* Since the above was written, H.M.S. Challenger has visited Melbourne, and Professor 
Thompson informed me that he also had dredged this species in a living state from a great 
depth, finding it to extend, like many others in the hitherto unexplored depths investigated by 
him, continuously from the Arctic into the Southern Ocean, 
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