PL.vri] XVI. 
I )e]topect(‘ii Mon-if:, sp. 
Fi". 1. IntfM'iial cast <>f left A’aha*. 
^VviculojH'cteii 1\J itclu'lli, Eth. Jil. and Dim. 
Fig. 2. Portion of riglit valve, showing large anterior costate auricle. 
Fig. 2. i\Iore convex valve, showing auricles in pai’t. 
l)cltopcthen farh>v<‘nsis, Eth. j'd. and Dan. 
Fig. 4. ]ni]ir(>ssion of right valve. 
Aviculopecten Sprenti, Johnston. 
Fig. 5, Drawing from a gelatine cast, an impression showing the form of the auricles. 
Fig. G. Finperfect specimen, showing the natui’e of (■ostation in largei’ sjM'cimen. 
Localitirs, 
Fig. 1. West IMaitland. 
Fig. 2. Pokoll)in, 
Fig. 3. Pokolhin. 
ig. 4. Pokolhin. 
Fig. 5, One Tree Point, Tasmania. 
Fig. G. One Tree Point, Tasmania. 
