FRESHWATER RHIZOPODA FROM THE HEBRIDES, ETC. 63 



Cryptodifflugia sacculus, Penard. 

 This species was not uncommon in the Shetlands and Hebrides, 

 and was also found from Sutherland. Length, 21-32 //; breadth, 15- 

 26/x; neck, 9-16/x (6, 10). 



Cyphoderia trochus, var. amphoralis, Wailes. 



This species has been recently described (to) ; it has the form of 

 C. ampulla, but the test is composed of imbricated scales and not 

 of discs placed side by side. It is one of the commonest species of 

 Cyphoderia in the British Isles. 



The individuals seen were of medium size, 100-T20/X long. 



Cyphoderia ampulla (Ehrenb.), Leidy. 

 The specimens found were above the average size as a rule, 

 several from Loch Kirbister, Orkneys, ranging between 130-171 /x in 

 length (10). 



C. ampulla, var. vitraea, Wailes (10). 

 Two small specimens of this variety were seen, one each from 

 Ncugles Water, Shetlands, and Loch Kirbister, Orkneys ; length, 

 87 fi and 60 /x; breadth, 35 fi and 3$/*; aperture, 13/x and 10 //. It 

 is characterised by having a clear transparent test with no visible 

 markings. 



Difflugia oviformis. Cash (3). 

 These were generally under the size given by Cash, being 

 75-90 /x long; but this is, I think, the most usual size. In some of 

 the gatherings they were not uncommon. This species occurs in 

 India and the United States (10). 



Difflugia subungualis, Penard (8). 

 A number of Difflugise were found, which although not typical 

 could only be referred to this species. Penard in his description of 

 this species {Revue Suisse de Z00L, 1910, p. 932) states that the 

 diameter generally exceeds the length, owing to the large aperture; 

 the young individuals are light in colour, becoming brown with age. 

 The ones I found were about equal in diameter and length, owing 

 to the aperture being somewhat smaller than in the type, and the 

 colour was never brown. Length, 68-84 /x; diameter 68-80 /x; 

 aperture, 42-60 /x. 



Eaglypha crista fa, var. major, W 7 ailes (10). 

 E. cristata was found only from Loch Kirbister, Orkneys; in 

 addition to the small typical individuals large spineless forms were 

 found ; similar ones were subsequently found on Inishbofin, Ireland, 



