68 MOLLUSCA OF SOMERSET. 
the delicate and many-ribbed P. nivews is only found in shel- 
tered locks and arms of the sea, moored by its strong byssus 
to the upper surface of the broad and smooth fronds of Lami- 
nariz.” He also thought that the “ variety purpurea forms 
another link in the chain of specific identity.” 
The type and both varieties occur on the Somerset coast 
about Minehead and Weston-super-Mare. 
Mr. J. T. Marshall records in the Journal of Conchology, 
vil, 340, the occurrence of the var. purpurea in the Bristol 
Channel, measuring three inches in length and 2} inches in 
breadth. 
Type, coasts about Weston. Rare; F. A. Knight. 
About Burnham and Berrow, rare, odd valves only ! 
PECTEN OPERCULARIS, Linné. 
The commonest representative of the genus on our coast ; 
easily distinguished from either of the preceding by its circular 
form, almost. equal ears, and greater stature. 
Burnham, Minehead, Weston. Uncommon! 
ASTARTIDZ. 
ASTARTE SULCATA, Da Costa. 
I found what appeared to be a worn valve of this species on 
the shore near Birnbeck Cove, Weston-super-Mare. It is not 
common in the south, excepting Milford Haven. 
CYPRINA ISLANDICA, Linné. 
Sands about Brean and Burnham ! 
LUCINIDA. 
LORIPES LACTEUS, Linné. 
A characteristic species of our muddy and sandy coasts. 
Weston-super-Mare and Burnham ! 
LUCINA BOREALIS, Linné. 
Another lover of muddy gravel and sand. 
Burnham. Uncommon! 
THYASIRA FLEXUOSA, Montagu (= Axinus flecuosus, Montagu). 
Frequents soft mud and sand. ‘ Young shells are globular, 
and the principal fold on the posterior side is visible in every 
