PLATE XI. 
[All the Figures are magnified about 25 diameters. | 
Figure 
1. Cytherella incurvescens, sp. noy., carapace showing the left valve, 
2. 
16. 
? ” ”? 
Cytherella Hibernica, J. & K., 
” ” ” 
. Leperditia Okeni, (Minster), 
” ” ” 
. Leperditia inornata (M‘Coy), 
” ” ” 
9 ” ” 
” ”? 2? 
(a) carapace showing the left valve, 
(6) edge view, . 
(a) carapace showing the left valve, 
(6) edge view, . 
(a) carapace showing the left valve, 
(6) edge view, . 5 
carapace showing the left valve, 
carapace showing the left valve, 
(a) right valve, 
(6) ventral view, . 
(a) left valve, 
(6) edge view, 
left valve, . 
right valve, . 
. Leperditia suborbiculata (Minster), carapace showing the left valve, 5 
. Leperditia Scotoburdigalensis (Hibbert), carapace showing the right valve, 
. Leperditia subrecta (Portlock), 
right valve, . 
right valve, . 
(a) right valve, 
(6) end view, 5 
(a) right valve, 
(6) ventral view, . 
[ 202 ] 
Locality. 
Cultra. 
Dromard. 
. Cultra. 
= ” 
Bundoran. 
