Wright — Recent Foraminifera of Down and Antrim. 103 



of selecting slack tides for dredging these parts, as otherwise the operations are 

 certain to end in disappointment and failure. 



A table is appended of the stations from which the various gatherings 

 were taken, with particulars of bathymetrical range, nature of sea bottom, 

 weight of material brought up, and number of species found. As the quantity 

 of material dredged varied greatly at different stations, it appeared desirable to 

 record the weight collected at each place, so as to arrive at a correct estimate 

 of the relative abundance of foraminiferal life at the various places. (1.) 



To my friend Mr. Henry B. Brady, F.R.S., I am deeply indebted for the 

 kind assistance he has rendered me in the critical examination of the doubtful 

 species ; and likewise to my friend Mr. William Swanston, F.G.S., for the accu- 

 rate and artistic drawings in the plate which accompanies this memoir. 



The following Foraminifera deserve a passing notice, viz. : — 

 BlLOCULINA RINGENS, (Lamk.). 



Generally distributed at various depths. A variety of this species is not 

 uncommon in deep water, small in size, and in contour approaching B. spha>ra. 



Triloculina oblonga, {Montagu). 



Very abundant in Strangford Lough, where the specimens are large and 

 typical ; in Belfast Lough it is rare, and the specimens usually small. 



Lituola globigeriniformis, P. and J. 



Not unfrequent in Belfast Lough and Strangford Lough; and it also occurs 

 plentifully in Cork Harbour and Kinsale Harbour. 



Lagena sulcata, W. and J. 



The costse on this species are sharply denned, about every alternate one 

 extending up the neck, round which they are usually somewhat twisted. 



Lagena costata, {Will.). 



This species differs from the last in being entosolenian; in full-grown ex- 

 amples the shell is spherical, with the costse slightly raised and very regular, 

 extending to near the neck, where they usually end abruptly, the remainder 

 being smooth, as is also the neck, which is short. The texture of the shell is 

 more glassy than in L. sulcata. Williamson's figure represents a young speci- 



(1.) A very ingenious dredge has been constructed by Mr. David Robertson, F.G.S., of 

 Glasgow. It dips deep into the bottom and fills quickly. It has an advantage over the ordi- 

 nary dredges in this respect, as each haul brings up a very uniform quantity of the sea bottom. 

 See notes on the recent Foraminifera and Ostracoda of the Firth of Clyde, by David Robert- 

 son, F.G.S.— Trans. Geol. Soc. of Glasgow, Vol. V., Part I., p. 112. 



