PLATE X. 
Deltopecteii leiiiusculus, Dana, sp. 
Fi^. I. Exfoliat('(l left valve with defective auricles. 
F^ii;'. '1. Fix foliated right valve of same specimen (Fig. 1). Faint traces of the linear costa* are 
]>pi-ee])til)l(* on the ('dg(*s of some of the concentric lamina*. 
Delto])ecten lima-fornns, Alorrix, sp. 
I’hg. •>. Internal cast of the united vaK'es, the umho of the convex valva* proti’uding al)Ovt*, and 
flu* cast of the large chondrophon* s***n in the centre of the cardiiril mai'gin. 
I'ig. 4. ] )ecorticated examph* of a i-omex valw*, dc'void of aui-icles. 
Aviculoj)ectf*n Mitchelli, Kth. JU. and Dun. 
lig. 0. T(*stiferous right valve, with the* eosto-radiate aiit(*rIor auriclt*. 
I >eltopectt*n Fittoni, MorrU', sji. 
I'ig. (). Mort* or h'ss exfoliat“d l(>Ft vah’e. 'I'lie linear c >-ita' art* visihh* in places on the major 
costa*. 
Local itie.'i. 
Figs. 1 
•7 
Maitland Histrict. 
Fig. 
Nowra 
Fig. 
k 
Uavenstleld 
Fig. 
•A. 
Pokolhin. 
Fig. 
G. 
lllawarra District. 
