30 
tlie bodies of the valves and auricles are decorated by a large number of fine 
radiating costa?, with smaller ribs intercalated, and crossed by regular 
concentric latilamiua?. Hinge-plates very long and linear with several 
resilium furrows, and a wide shallow chondrophore in the left valves. 
Ohservaiions. — Deltopecten farleyensis is a very distinct species owing 
to its widely triangular or broadly fan-shaped outline, and great length of 
the dorsal margin; it must have been a thin and delicate shell. Amongst 
our Australian Pahnopectens it stands alone and has no near ally, and is 
altogether a striking-looking form. Both valves appear to all intents and 
purposes to have been flat, or at any rate very slightly convex. In its fine 
and very numerous linear costa? D. farleyensis resembles D. leniuscnlas. 
Localities and Horizon,- — llutherford, near Farley {W. S. Lun) •, 
three hundred yards west of Farley Bailway Station {T. ir.E.Daxul)-, 
Clift’s Paddock, Lochinvar {T. TV. E. David)-, near Golden Age Mine, 
Boorook {E. C. Andreics) ; Pokolbin [C. A. Siissmilch). — Permo-Carboniferous 
— Lower Marine Series. 
Collections . — Mining and Geological Museum ; Geological Dept., 
Technical College. 
Deltopecten Fittoni, Morris, sp. 
(Pkte Vnr, Figs. 1-3; PI. X, Fig. G; PI. XVI, Fig. 1.) 
Decten Eitloni, Morris, ytrzelecki’.s Pliys. Descrip. N. 8. Walo.s, etc., 184-0, p. 277, t. 14, f. 2. 
Observations. — Morris figured a nearly complete left valve, but 
ajiparently with the test ineomplete. It is the : — 
1. Aviculopectcn Fittoni, De Koninck.^ — This author gave two figures, 
one a copy of the type figure, the other an internal cast of apparently the 
right valve. No other figures are extant that we know of. 
We have before us both right and left valves. The orbicular shell is 
bi-convex, the valves equal and tumid, some specimens having a dumpy or 
squat appearance. The dorsal margins are less in width than the valves, the 
lateral and ventral margins combined almost forming a semicircle, the outlines 
on the anterior and posterior sides being Avell-i’oimded and rather projecting ; 
the umbos ai’o fairly acute. The anterior auricles are by no moans large in 
proportion to the size of the valves, somewhat flattened, with rounded outer 
margins, and shallow open emarginations. The posterior ears are also 
^ Ue Koninck — Eecli. Foss. Pal. Nouv.-Galles du Sud, PL 3, 1877, p. 102, t. 21, f. 4, 4a. 
