PLATE II. 
AviculojX'c'ten Eth. fil. ami Dun. 
Fig. 1. Li'ffc valve, as ia Plat(' I, 1 and 3. 
I '(‘Itonectea illa\\ iUTeasis, Morris, ,sp. 
Fig. 2. 31ore oi' less te.stit'erous coms'x \alve, witli coai'se rounded costiu, and clo.se concentric 
frills ; portion of one auricle, costo-radiate, is also preserved. 
Fig. d. 1‘artly testiierous less convex ^alve, but in a more decorticated condition than Fig. 2, 
and t!u‘ co.sta' sharper. 
A\ iculopc'cten s(pianiulifeni.s, Morris, sp. 
Fig. 4. I'ixteriial impression of a right valve of a younger indi\ idual than that reiiresentod in 
Plate 1, Fig. 4, taken from a relief. 
Fig. 5. Internal cast of a right vahc. 
Aviculopecten Sprenti, Johnston. 
Fig. (). Intt'rnal cast of a left \ al\(', with juimary and secondary costa* only, and the auricles 
slightly imjierfect. 
big. 7. External impression of a left valve taken from a relief, exhibiting spined primary, 
secondary, and tertiary costa*, almost perfect auricles similarly spined, and a li?ie 
<if spine bases along the cardinal iiiargin ; the lateral extension of the posterior 
auricle is to be imted. 
Loculi firs. 
Fig. 1 . 
Harjier's Mill, near Allandale. 
Figs. 2, .‘k 
lioatl cutting, near Allandale 
Fig. 4. 
llavenslleld. 
Fig. -j. 
f'arley. 
Fig. (). 
Farley. 
Fig. 7. 
Lochinvar. 
