PLATE 46, 47, 48, 49. 
Not uncommon in most parts of the county where lime- 
stone is found ; frequent in Dovedale. 
Fig. 13. a specimen showing the flatter perforated valve. 
14. The same, placed so as to show the hinge and beaks, 
with the upper part of the other valve. 
FIG. 15, 16. 
CONCHYLIOLITHUS Anomites (acutus) semicir- 
cularis longitudinaliter asqualiter striatus, margine 
crenulato : sinu magno angulato. S. p. 
A fossil shell. Original an Anomia. Perforate. Valves 
convex, semicircular, marked with deep, longitudinal, 
equal striae. Hinge patulous, straight, but not extending 
the whole breadth of the shell. Foramen triangular, large. 
Beak of the perforated valve prominent, pointed, incurved ; 
the other short and obtuse. Margin acutely crenate, and 
furnished with a large angular sinus, causing a somewhat 
strong plicature on the surface of the valves. 
Not frequent. Small. Limestone*. Winster, 
Fig. 15. A specimen showing the smaller valve, with 
the beak and perforation of the larger valve. 
16. The same, placed so as to show the margin. 
2 A 
