MOLLUSCS 



MARINE 



In 1848 Mr. J. Alder gave a' Catalogue of the Mollusca of North- 

 umberland and Durham,' in the Trans. Tyneside Nat. Field Club. Subse- 

 quently Alder and Hancock published through the Ray Society their 

 magnificent monograph on the Nudibranchiate Mollusca, and in that work a 

 large number of species were described or recorded from the north-east 

 coast. Other lists of mollusca were subsequently added by Mr. Alder in 

 vols. v. and vi. of the Trans. Tyneside Nat. Field Club, and vol. i. of 

 the Trans. Nat. Hist. Soc. Northumberland and Durham. The Editor also 

 possesses a MS. list given to him by Mr. Alder which contains additions 

 to the fauna of the district as well as a list of certain names which were 

 contained in Mr. Alder's original catalogue, and which he considered 

 ought to be struck out. From these various sources the following list of 

 Durham species has been compiled. 



The North Sea has long been famous for the very fine and rare 

 species of mollusca which were brought in to the north-east coast by 

 the long-line fishers, and were sold at very high prices, since at that 

 time they were unknown elsewhere ; and at the present day, though 

 most of them have been found in some other places, they are still rare, 

 and highly esteemed by conchologists. These shells are Panopcea 

 norvegica, Natica pallida, Amauropsis islandica, Liomesis dalei, Volutopsis 

 norvegicus, Beringius turtoni, and Buccinofusus berniciensis ; more recently 

 Calliostoma occidental has been added. They are all high-boreal forms 

 which are found on the Norwegian coast. Although most of them are 

 known now also to occur off the Aberdeenshire coast, in the sea around 

 Shetland, and off the north-west of Scotland, nevertheless, the Dogger 

 Bank neighbourhood is still likely to remain the chief locality from 

 which collectors may hope to obtain specimens. 



AMPHINEURA 



Hanleja hanleyi (Bean) Callochiton krvii (Mont.) Craspedocbiltu albas (Linn.) 



Tonicella marmorea (Fab.) CrasfeJoctilut onyx (Speng) Acanthochitet fatcicularit (Linn.) 



ntbra (Lowe) cinereus (Linn.) 



PELECYPODA (Oysters, mussels, &c.) 



Ntuula n'ttiJa, Sow. Mytilui tdulis, Linn. Pttten maximal (Linn.) 



- nucleus (Linn.) yolsella modiolus, Linn. push (Linn.) 



tennis (Mont.) var. gigat, Norman variits (Linn.) 

 Nuculana minuta (Mall.) MoJiolaria marmorata (Forbes) opercularis (Linn.) 

 Anomia patelKftrmis, Linn. distort (Linn.) tigrinus (Mall.) 



ephipfium, Linn. discrepant (Leach) itriatus (Mall.) 

 Area tttragina, Poli. Ostrea edulii, Linn. - simiRs (Laskey) 



8? 



