NORTHITIOE BLAND AND DURHAM. 103 



2 B. makginaxa, Li 1 Orb. Buliniina pupoides, var. marginata. 

 Roc. For. Gt, Br. PI. V, figs. 126, 127. 



Common. 



3. B. aculeata, D' Orb. Buliniina pupoides, var. spinulosa, 



Rec. For. Gt. Br. PI. V, fig. 128. 



This is in reality only the foregoing form B. marginata, with 

 the serrations of the chamber-margins somewhat exaggerated so 

 as to form spinous processes. Some of the Seaham Harbour 

 specimens fairly come under this variety, though none are quite 

 so strongly marked as Professor "Williamson's figure. 



4. B. ovata, D' Orb. Bulimina pupoides, var. fusiformis. Rec. 



For. Gt. Br. PI. V, figs. 129, 130. 



Off Coquet Island, rare. 



5. B. elegantissima, IP Orb. Bulimina elegantissima.' Rec. 



For. Gt. Br. PI. V, figs. 134, 135. 



Very rare. One or two specimens only, irbm Berwick Bay. 

 7. VIRGTJLINA, D'Orb. 



1. V. Schreibersii, C%jzek. Bulimina pupoides, var. compressa, 

 Rec. For. Gt. Br. PI. V, fig. 131. 



Berwick Bay, very rare. 



8. BOLIVINA, D'Orb. 

 1. B. punctata, D'Orb. [PI. XII, figs. 8, a.b.] 

 Off Holy Island, very rare. 



Although biserial in the arrangement of its chambers, Bolivina 

 belongs typically to a triserial group, Bulimina. The relation- 

 ship may be traced in the twisted aperture and usually curved 

 mode of growth. The strong resemblance which this species, in 

 the feeble condition in which it is found in the British seas, bears 

 to the young of some of the Textularm, has probably caused it 

 to be overlooked by many observers. Mr. W. K. Parker has 



