NORTHUMBERLAND AND DURHAM. 93 



2. BILOCULINA, JD'Orb. 



1. B. ringens, Lamli. Biloculina ringens. Bee. For. Gt. Br. 



PI. VI, figs. 169, 170; and PL VII, fig. 171. 



Common, especially in shallow water and amongst littoral 

 sands. 



2. B. dbpressa, D' Orb. B. ringens, var. carinata. Bee. For. 



Gt. Br. PI. VII, figs. 172-174. 



Abundant everywhere along the coast. 



3. B. elongata, I? Orb. B. ringens, var. Patagonica, Bee. 



For. Gt. Br. PI. VII, figs. 175, 176. 



Not uncommon in dredged sands. 



3. SPIROLOCULINA, D'Orb. 



1 . Sr. limbata, i)' Orb. Spiroloculina depressa. Bee. For. Gt. 



Br. PI. VII, fig. 177. 



Common in dreclgings from all depths. 



2. Sp. planulata, Lamli. Sp. depressa, var. rotundata. Bee. 



For. Gt. Br. PL VII, fig. 178. 

 Common. 



3. Sp. excavata, D'Orb. [Plate XII, fig. 1.] 



Though not recognized by Professor Williamson, this is a 

 tolerably well marked sub-varietal form of Spiroloculina, charac- 

 terized by its thick edges and deeply sunk centre. It is described 

 and figured by D'Orbigny, in his work on the "Fossil Foramini- 

 fera of the Vienna Basin," p. 270. PL XVI, figs. 19-21. 



In deep water, Northumberland and Durham coast, somewhat 



rare. 



4. TBILOCULINA, D'Orb. 



1 . T. trigonula, Lamli. Miliolina trigonula, Bee. For. Gt. Br. 



PL VII, fig. 180-182. 



Abundant all along the coast. 



2. T. oblonga, Montagu. Miliolina Seminulum, var. oblonga. 



Bee. For. Gt. Br. PL VII, figs. 186, 187. 



