IG 
Ohsercaiions. — This very handsome shell is one of our most heautiful 
Paheopectens, and can in no way i)e mistahen for any other speeies. In its 
outline and convexity it a])])roacl!es A. fcnuicoUis, hut the form of the 
posterior auricle, its scul])tiire, and that of the valve generally, distinguishes 
ui. Spreuti. Whereas the outer edge of the posterior auricle in ui. tcnuicollis 
is obtusely round('d,the corresponding portion in A. Spreuti terminates along 
the dorsal mai’gin in an acute prolongation. 
Another very noticeable feature in the present species is the wid<> and 
nearly semicii'cular ventral margin, the hiteral costm on both sides curving 
or sweeping outwards in a very marked inanner to accommodate themselves 
to this exjiansion. This is visible to some extent in IT. II, Eig. 7, and 
IT. XIII, Eig. 9, but is even more cons})icuous in El. VIII, Eig. 12 ; the 
strong radiating costae of the auricle arc also pi’ominent features. The right 
valve is unknown. 
We base our recognition of this species as a Xew South Wales form 
as a result of the loan, from Mr. Alexander Morton, Curator of the 
Tasmanian jMuseum, of a collection of Ealaeopcctens from the Permo- 
Carl'oniferous rocks of that State, amongst ndiicli we recognised the ty])e 
of Johnston’s A. Spreuti. The figure given in the “ Systematic Account ” 
is very inadequate as to details, but the measurements of tlie figure agree 
nith those of the specimen. I’he latter is an impression of a left vmive, with 
the body-sculpture clearly preseined - consisting of from sixteen to eighteen 
primary costie, with a secondary and two tertiary costre Ix'tween each pair. 
Eine decussating frills cross all these, the points of intersection with tbc 
})rimary costae slightly enlarged, or subnodc-like, indicating the positions of 
the s})ines represented in our IT. VIII, Eig. 12. The auricle, so far as 
they are preserved, equally corre.s])ond with our local exam])les. 
The valve figured on PI. XIII, Eig. 9, we regard doubtfully as 
A. Spreuti. It displays a similar proportionate breadth of valv(‘, and 
outward sweep of tlu' costie, but there is not a suflicimitly clear demarcation 
between them individual ly*to be in strict accordance with those of A. Spreuti. 
Localities and Ilorizous. — Hartley Vale {II. G. llieuils). — Permo- 
Carboniferous — Upper Marine Series. Earley {J. jratertiousc) ; Harper’s 
Hill {T. IV. E. David) ; Rutherford Railway Cutting, 200 yards from Allan- 
dale (C. Catlett) ; hall' a mile from Lodiinvar Station {C. Cnlleu) ; Ravens- 
ticld ; Locdiinvar ; near Pokolbin {C. Culleu)-, One Tree I’oint, ’fasmania 
( Tasttiauiau Masema). — Permo-Carboniferous - Lov/er Marine Series. 
Collection. — Mining and Geological Museum. 
O O 
