2 THE MOLLUSCA OF THE FIRTH OF CLYDE. 
This wide distribution in space may be matched by its 
equally great range in time; for if its identity with T. striata 
( Wahlenberg )beadmitted,it existed far back in the cretaceous 
period, and is thus indeed one of those 
SET ARIS Gh Bs 
That on the stretched forefinger of all time 
Sparkle for ever.” 
The comparison of this plain and sober looking shell to a 
jewel may seem far fetched even to a conchologist; but, 
whether it be by reason of its high lineage, old world aspect, 
or the interest connected with its discovery in British waters, 
few conchologists can see it—common though it be—brought 
up by the dredge, 
*«'That woo’d the slimy bottom of the deep,” 
without a certain emotion. 
FAMILY CRANIADA, King. 
CraniA, Philippson. 
Crania anomala, O. F. Miiller. 
Patella anomala, Miiller ; Patella distorta, Montagu ; Orbi- 
cula Norvegica, Lamarck; Crania personata, Sowerby ; 
Criopus anomalus, Fleming. 
Habitat—On stony ground, from 15 fathoms downward, 
in company with the preceding species, but common every- 
where throughout the district on suitable ground; specially 
plentiful in Rothesay Bay, off Bogany. 
British distribution.—Throughout the Scotch and Irish 
coasts ; common. 
Foreign localities—Northern Europe generally, and in 
the south at Vigo (M‘Andrew) and the Mediterranean (Nares 
and Spratt). It does not appear to have been noticed as an 
inhabitant of any part of North America except Greenland. 
Ciass CONCHIFERA. 
ORDER LAMELLIBRANCHIATA. 
FAMILY ANOMIIDA, Gray. 
AnomiA, Linné. 
* Anomia ephippium, Linné. 
Ostreum parvum, Lister; Anomia electrica and Anomia 
squamula, Linndé. 
Habitat—From low water mark of ordinary tides down 
