104 Wright— Recent Foraminifera of Down and Antrim. 



men; in this state it has no neck, the shell is thin and sufficiently transparent to 

 show the internal tube. 



Lagena Williamsoni, (Alcock). 



This form differs from Lagena costata, to which it is closely allied, in being 

 smaller in size, less spherical in shape, and the sulci more sharply defined Its 

 chief peculiarity, however, is in the neck, which is short, and formed of two 

 distinct portions — the first directly continuous with the body, and ornamented 

 with two or three rows of hexagonal reticulations; the second a small cylindrical 

 tube, continued from the centre of it. This form is abundant everywhere round 

 our coast, and common in the Estuarine Clay at Magheramorne, County Antrim. 



Lagena striato-punctata, P. and J. 



A few examples of this Lagena were met with in Strangford Lough; one 

 specimen was also found in Cork Harbour. Abundant in the Estuarine Clay at 

 Magheramorne, County Antrim (i). 



Lagena hispida, Reuss. 



Ovate, surface covered with numerous blunt spines having a tendency to 

 run into one another in longitudinal rows ; a very rare species, only a few ex- 

 amples having been found. It is new to Britain. 



Lagena Jeffreysii, Brady. 



Only one example found ; transverse section round. Mr. H. B. Brady, 

 F.R.S., informs me "that the species is usually slightly quadrate in transverse 

 contour, but sometimes quite round; is always slightly aculeate; the aculei quite 

 spinous and pointed, very numerous and minute, and the neck commonly with 

 spiral ornamentation. It often has to be washed with hot solution of some al- 

 kali to get the encrusting dirt off, as it seems without this a mere rough form 

 that catches dirt." 



Lagena trigono-marginata, P. and J. 



A three-sided form of Lagena marginata. Very rare. 



Lagena oblonga, [Seguenza). 



A three-sided form of Lagena lucida. Very rare. A few examples have 

 been found in the Estuarine Clay at Magheramorne, County Antrim. 



(i.) I am indebted to my friend Prof. T. Rupert Jones, F.R.S., for his opinion on this 

 Lagena and for some of the other Foraminera given in this list. 



