304 Mr. J. Sinitli on the Upper Silurian 



entii-c tubes twisting in every direction. Tlie illustration I 

 give is a portion of a small mass, antl would have been more 

 completo but tor the shale, which more or less covers the 

 tubes. 



Loc. Mulde and Frojel. 



Hyperammina minittissiina, sp. n. 



From its minute size and rough surface, Mr. Wright 

 thinks this form may be made a new species. This little 

 fossil is attached to a spicule, the tigure showing about a 

 third of it magnified 1000 diameters. 



Loc. Wisby Cement Works. 



Hyperammina rectangiila, sp. n. 



This is also a branching form, and the two figures will 

 show how the branches go off at nearly right angles. Both 

 figures show the primordial cell (also seen in living specimens 

 ot //. vagans), one of them with a ring. The dimensions are 

 given in Ex|)lanation of Plate (p. 309). 



Loc. Mulde and Frojel. 



From the Gothland shales I have obtained a series of 

 Hyperammina, ranging in size between the largest and smallest 

 species given above, and several ''species" might easily be 

 made from them ; but as they are smooth and follow more or 

 less the character of //. vagans, they may be placed with 

 that species. 



Hyperammina ramosissima, Ciiap. 



The figure will show the branching-habit of this species, a 

 feature from which it takes its specific name. 

 Loc. Gothem. 



Reoplax pilulifera, Brady. 



The specimen is probably incomplete, shows three loculi- 

 ments with very distinct perforations. 

 Loc. Korpklint. 



Beoplax adunca, Brady. 



This is a rare species. 

 Loc. Slet^. 



Haplophragmium latidorsatum, Born, sp. 

 Loc. Gothem. 



