AND DESCRIPTION OF A NEW SPECIES OF AUCELLA. 91 
. 
posterior ear than in the left valve; anterior margin roun 
of growth. Hinge line of both valves short, but longest in the 
right ; no tooth visible in the interior of the right valve. 
important addition to the Cretaceous Fauna of Australia. ° 
mention of the genus is made as occurring in any of the collections 
examined from time to time by Professor McCoy, nor did the late 
Mr. Charles Moore enumerate it amongst the secondary fossils” 
described by him from North Australia.’ 
Aucella Liversidget is undoubtedly allied to two of the types 3 
‘A : 
3 
the two species in question is very remar able. A. Live 
is also allied to the Indian Cretaceous species A. parva, Stoliczka, 
but the left valve in the former is more inoceramiform than in the 
r, and more oblique 
1 A. speluncaria, Schlotheim,’ there are radiating stri, and our 
Species is less deltoid and more regular, and there is no inflection 
of the ventral margin. 
A. Hausmanni, Goldfuss,’ from the Zechstein of Scharzfeld, is @ 
much more slender shell than the Australian species, less convex, 
more elongate from the beaks to the ventral margin. Anothe 
es, A, Caucasica, Abich,’ possesses fine radiating strie, to 
Say nothing of a larger ear in the right valve, a more pointed and 
Prominent umbo in the left, and a generally different outline to 
the valves. There appears to be at least one very interesting 
et eee oe ae 
See.» 1870, xxvi, p.p. 226, 261. 
2 ¥&tschora Land, p. 299, f. 16, f. 1-7. 
5 Lal. India, iii, Fe 404, t. 33, f. 2-3. 
: san Petre. Geamel & p. 168, t. 138, £. 4. Aucella, Geinitz, 
"Zeit. d, ‘Deutechen Geol Gesellschaft, 1951, ili, p, 31, t. 2, f 1. 
1 A 
Australian ‘Mesozoic Geology and Paleontology. Quart. Jour. Geol. 
» Pp z 
