162 BRITISH FRESHWATER, RHIZOPODA. 



Dimensions : Length 85-150 /n ; breadth, in broad 

 view rather more than half the length, in narrow view 

 about one-third the length. 



In Sphagnum-TpocA, Killough, Co. Wicklow, Ireland; 

 September, 1908 (/. Hopldnson}. 



This peculiar rhizopod was detected by Mr. Cash in 

 Sphagnum from a small pool on the Great Sugar Loaf 

 Mountain, Co. Wicklow, and appears (as Pontigulasia 

 incisa) in his list of species from that locality, but it is 

 not in his MS. of this work nor had he written a 

 description of it. It is therefore with some hesitation 

 that it is added here, but the species is so distinct from 

 any other Pontigulasia that he can scarcely have been 

 mistaken in his identification. 



Originally described by Penard as a Difflugia, it was 

 described by Rhumbler under a different specific name 

 when he gave generic rank to the group of species 

 possessing a diaphragm. Not only must that name 

 (incisa) fall, but his P. compressa also, being pre- 

 occupied by Carter's species described on p. 62. 

 Rhumbler's P. compressa (which might now be called 

 P. Rhumbleri) is the only known Pontigulasia besides 

 P. elisa with the diaphragm forming a similarly-shaped 

 bridge across the test, but the test of that species is 

 much broader in proportion to its length and is not 

 perceptibly constricted at the diaphragm.] 



