bo 
6, 7. 
PLATE XLII. 
PHoLapomyA (continued). 
. P. decussata (Mant.). Chalk Marl, Chertsey. York Museum. Left valve. 
(P. 250.) 
P. cordata, Tate. Upper Chalk (White Limestone, zone of Belemnitella 
mucronata), Tamlacht, co. Derry. Museum of Practical Geology, 
No. 23628. a, left valve; b, dorsal view; c, anterior view. (P. 253.) 
renus—Myoruonas, Dowvillé. 
M. sp. ef. senrcostata (Agassiz). Lower Greensand, Furze Hill, Faringdon. 
Sedgwick Museum. Internal cast. a, right valve; b, dorsal view. 
(P. 253.) 
Genus—GONIOMYA, Agassiz. 
G. Archiaci (Pict. and Ren.) Lower Greensand (Crackers), Atherfield. 
Sedgwick Museum. Right valves. 4, dorsal view of 4a. (P. 254.) 
G. Mailleana (VOrb.). Sedgwick Museum. 6, Base of Chalk Marl, Chard ; 
a, part of left valve; b, dorsal view. 7, Upper Greensand, near 
Maiden Bradley; right valve. (P. 255.) 
