NORTHUMBERLAND AND DURHAM. 95 



Its nearest ally is Q. secans, D'Orb., a well known form, more 

 oblong in contour, and having the extremities somewhat pointed ; 

 the edges thin and sharp, often carinate, the surface commonly 

 marked by slight ribs across the chambers. These characters are 

 sufficient to distinguish the two. In Professor Williamson's 

 work, Q. sulrotunda is given as a synonym for MiUolina (Triloe- 

 ulina) trigonula, possibly owing to Montagu's description. 



Not uncommon in shallow water and amongst littoral sands. 



6. Q. agglutinans, JD' Orb. 



A feeble variety of Quinqueloculina in which the normal, white, 

 porcelanous test is replaced by a composite shell, composed of 

 arenaceous particles embedded in a chitinous matrix with but 

 little calcareous matter. It is figured by D'Orbigny in his 

 "Cuba" monograph, Plate XII, figs. 11-13. (Polio edition.) 



In the brackish- water pools of Hylton Dene, common ; in pools 

 at the month of the Wansbeck, rare. 



Pam. LITUOLIDA. 



1. TROCHAMMINA, P. % J. 



1 T. inflata, Montagu. Rotalina inflata. Pec. For. Gt. Br. 

 PL IV, figs. 93, 94. 



In brackish water at the mouth of the Wansbeck, very com- 

 mon ; in similar pools in Hylton Dene, rare. 



It seems curious that this well-marked species, which has been 

 only found hitherto by single specimens on the south-west coast 

 of England, and in one or two localities on the west and north of 

 Scotland, and has never been discovered either in dredged or 

 littoral sands, on our shores, should have adopted these brackish- 

 water pools as a resting place. In the Northumberland locality 

 it seems to thrive better than any of its congeners. The speci- 

 mens are commonly fine, exhibiting the peculiar sub-arenaceous 

 shell and dark coloured earlier chambers well delineated in Pro- 

 fessor Williamson's figures. 



