318 MR. G. 8. WEST ON SOME BRITISH 
the shell. Only once have I obtained it from wet rocks, and 
that was at an elevation of 3000 ft. on Snowdon, N. Wales. 
The three following are the most noteworthy forms I have met 
with :— 
From a bog near Widdale Beck, N. Yorkshire, numerous 
large specimens were noticed with thin chitinoid shells with which 
were incorporated very large Diatoms (Navicula viridis and 
NV. major). Precisely similar forms were noticed in which the 
shells consisted almost entirely of Diatoms (Vanheurckia rhom- 
boides and Navicula divergens) from near Clapham, W. Yorkshire, 
and from Mickle Fell, N. Yorkshire. 
From Lough Shannacloontippen and Ballynahinch, W. Ireland, 
numbers of minute forms of this Rhizopod were observed. The 
shell was chitinoid, of a pale yellow colour, and a few sand- 
grains were attached irregularly at the fundus. The same form 
was noticed from Capel Curig, N. Wales, except that the 
chitinous shell was colourless. Length of shell 29-80 p; breadth 
18-24 pw. (Pl. 28. figs. 13, 14.) 
From Llyn Idwal, N. Wales, the forms possessed long slender 
necks, and the shell was composed of exceptionally large sand- 
grains. The same form was also obtained from Cockett Moss, 
near Giggleswick, W. Yorkshire. Length of shell about 250 p ; 
breadth 46 p. 
Var, vas, Leidy, Freshw. Rhiz. N. Amer. 1879, p. 99, t. xii. 
ff. 2-9.—D. vas, Leidy, in Proc. Acad. Nat. Sci. Philad. 1874, 
p. 155; 1875, p. 307. 
Not uncommon, but rarely so abundant as more typical forms 
of D. pyriformis. The peculiar neck of this variety is very 
characteristic. 
The largest forms seen were from the New Forest, Hants. 
Length of shell 470; breadth 380; breadth of neck 100 p. 
Some peculiar forms were seen from Llyn Idwal, N. Wales, in 
which the sand-grains composing the neck were quite transparent 
and colourless, whereas those composing the body of the shell 
were yellow and opaque. Length 460; breadth 300 u. 
20. DiFFLUGIA URCEOLATA, Carter, in Ann. Mag. Nat. Hist. 
xiii. 1864, pp. 27, 37, t. i. f. 7; Letdy, lc. p. 106, t. xiv.— 
D. lageniformis, Wallich, in Ann. Mag. Nat. Hist. xii. 1864, 
p- 240, t. xiv. i. 15, 16. é 
