NORTHUMBERLAND AND DURHAM. 105 



12. TRUNCATULINA, If Orb. 



1. T. lobatula, Walker. Truncatulina lobatula. Pec. For. 



Gt. Br. PI. V, figs. 122-123. 



Very common. 



2. T. refulgens, Montfort. [PI. XII, figs. 9, a.b.c] 



This has Dot hitherto been regarded as a British variety. It 

 is little more than an exaggerated condition of T. lobatula, in 

 which the convexity of the upper surface is greatly increased so 

 as to give it an almost conical form, and the pseudopodial per- 

 forations obliterated by the free growth of shell-substance. I 

 have recently met with specimens from two or three British 

 localities. T. refulgens occurs both fossil and recent, and is not 

 an uncommon form where Planorbulincn abound. 



Off Holy Island, 30 to 40 fathoms ; rare. 



13. EOT ALIA, Lamk. 



1. P. Beccarii, Linn. Potalina Beccarii. Pec. For. Gt. Br. 



PI. IY, figs. 90-92. 



Common. 



2. P. nitida, Will. Potalina nitida. Pec. Por. Gt. Bt. PI. 



IY, figs. 106-108. 



Northumberland coast, very rare. Cullercoats, rare ; Mr. 



Alder. 



14. PATELLINA, Will. 



1 . P. corrugata, Will. Patellina corrugata. Pec. Por. Gt. Br. 

 PI. Ill, figs. 86-89. 



Yery rare. Two specimens from dredgings off Holy Island, 

 and a single small one from Berwick Bay, are the only examples 

 of this species which I have met with on our coast. 



Pam. NUMMULINIDA. 



1. POLYSTOMELLA, Lamk. 



1. P. crispa, Linn. Polystomella crispa. Pec. For. Gt. Br. 

 PI. Ill, figs. 78-80. 



Common. 



