306 Mr. J. Smith on the Upper Silurian 



a^ view of aperture; &, c, undersides. Some of the shapes 

 are identical to those assumed by tlie little freshwater Rhizo- 

 pod of our ponds and ditches called Diffiugia. 



Loc. Lau Canal, Sluguklint, Korpklint, Stora Carlso. 



Lagena Icevis, Montag., sp. 



The two figures give tlie extreme variation in shape seen. 

 Loc. Lau Canal and Sluguklint. 



Lagena clavata, D'Orb., sp. 



The two figures show the extreme of variation. 

 JjOC, Sluguklint. 



Lagena gracillima, Seg., sp. 



The two figures show considerable differences in sliape, but 

 not any more so tiian recent forms. 

 Loc. Wisby Cement Works. 



Lagena parheriano, Brady. 



The seven figures I give of this species will show how it 

 varies in shape and size. 



Loc. Stora Carlso, Lau Canal, Eofvar Liljas hiilo, and 

 Sluguklint. Common in the Carboniferous limestones of 

 Scotland. 



Lagena auricnlata^ var. Unearituha, Cushman. 



I had regarded this form as a FusuUna, but Mr. Wright 

 has no doubt of its being a Lagena. 

 Loc. Wisby Cement Works. 



Lagena cylindrica, sp. n. 



This species is all but cylindrical, with the neck of the 

 tube sometimes slightly bent. 



Loc. Stora Carlso and Wisby Cement Works. 



Lagena gottlandica, sp. n. 



Globular, with a short tube. 



This form differs from all recorded species of Foraminifera 

 in having minute concentric strise, resolvable by high powers 

 into beaded lines running round the test. As wasted speci- 

 mens it is not infrequent, but when perfect it is a bright 

 glittering little form. 



Loc. Stora Carlso. 



