126 
SPECIFIC 
on the area well defined ; anterior side nearly 
flat, posterior one convex except towards the 
margin. 
Inhabits the Indian ocean. 

PLATE VI. 
Fig. 1. II INGE of Mactra Intrana, 
Fig. 2. Mactra St alt or um. 
Shell subdiaphanous, smooth, obsoletely radiate, 
purplish within ; area gibbous. 
Lister Conch. Tab. 251. 
Specimen pale brown inclining to cinereous, 
with paler rays, finely striate transversely. 
Inhabits the English coast. 
Fig. 3. Hinge of Donax /Scor/fww. 
Fig. 4. Don AX denticulata. 
Shell very obtuse on the anterior side ; lips 
transversely wrinkled ; margin denticulate ; shell 
striate longitudinally. 
Lister Conch. Tab. 376, Fig. 218, 219. 
