LUSITANIAN PROVINCE. 63 
The following are at present peculiar to Britain :— 
Assiminea, sp. Odostomia, 19 sp. ? Montacuta ferruginosa. 
Jeffreysia, sp. Buccinum fusiforme. Argiope cistellula. 
Otina oOiis. Fusus Berniciensis. Pecten niveus. 
Rissoa, sp. » Turtoni. Syndosmya tenuis. 
Stylifer turtoni. Natica Kingii. Thracia villosiuscula. 
The most common edible species are :— 
Ostrea edulis, Mytilus edulis. Fusus antiquus. 
Pecten maximus. Cardium edule. Littorina littorea. 
y»  opercularis. Buccinum undatum, 
Amongst the species characteristic of the Celtic province—or 
most abundant in it—are the following :— 
Trophon muricatus. Littorina littoralis, Venus striatula. 
Nassa reticulata. Trochus Montagui. »  casina. 
Natica Montagui. >,  millegranus. Donax anatinus, 
» monilifera, »  tumidus. Solen ensis. 
» nitida. Patella vulgata. Pholas candida. 
Velutina levigata. » pellucida. Mactra elliptica. 
Turritella communis. Acmea virginea, »  solida 
Aporrhais pes-pelecani. Chiton cinereus. Periploma preetenuis. 
Rissoa cingillus. Scaphander lignarius. Thracia distorta. 
Scalaria Trevelyana. Tellina crassa. Syndosmya prismatica. 
The wide expanse of the Baltic affords no shell-fish unknown 
to the coasts of Britain and Sweden. The water is brackish, 
becoming less salt northward, till only estuary shells are met 
with, and the Littorinee and Limneeans are found living to- 
gether, as in many of our own marshes. This scanty list is 
taken from the Memoirs of Dr. Middendorff and M. Boll. 
Buccinum undatum. Neritina fluviatilis. Tellina Balthica. 
Purpura lapillus. Limneza auricularia. » tenuis. 
Nassa reticulata. » ovata. Scrobicularia piperata. 
Littorina littorea. Mytilus edulis. Mya arenaria, 
Patella (tarentina). Donax (trunculus). » truncata. 
Hydrobia muricata. Cardium edule var. 
Meyer and Mobius collected the following species at Kiel :— 
Chiton cinereus. Rissoa parva. Cerithium reticulatum. 
Acmea testudinalis. Littorina littorea. Nassa reticulata. 
Rissoa labiosa. 5 littoralis. Buccinum undatum. 
»  inconspicua, an tenebrosa. Fusus antiquus. 
»  ulve. Lacuna vincta. 
»  ventrosa. »  pallidula. 
TV. LUSITANIAN PROVINCE. 
The shores of the Bay of Biscay, Portugal, the Mediterranean, 
and N. W. Africa, as far as Cape Juby, form one important 
province, extending westward in the Atlantic as far as the Gult- 
