SPHENODBKIA IIAOEOLEPIS. 63 



Length 27-45 ju.; breadth 24-34 ju.; aperture about 

 half the breadth; thickness about two thirds the 

 breadth ; nucleus about 6 ju, in diameter. 



Habitat. — Sphagnum. Rare. 



England. — Easedale Tarn, Westmorland (Broivn) ; 

 Isle of Wight ; Haldon Moor, Devonshire. 



Wales. — Bettws-y-Coed, Carnarvonshire (Hoph.). 



Scotland.- — Scourie, Sutherlandshire ; Stranraer, 

 Wigtownshire {Brown). 



Ieuland. — Belclare and Clare Island, Mayo ; Inish- 

 bofin, Gralway ; Cahircivean, Kerry. 



Although rare, this species is probably widely dis- 

 tributed in the British Isles, but owing to its small 

 size is liable to be overlooked ; the average size of 

 American individuals is, length 30-33 ju, ; breadth 

 20-23 ju,, which is rather less than in Great Britain. 

 It is not common in the United States. 



The two large plates forming each side of the test, 

 in broad view, are always very uniform in shape and 

 proportionate size, but the other plates and discs have 

 a considerable range of shape and disposition ; the 

 aperture is terminal and linear, but the lips, as in the 

 other species of the genus, have probably a consider- 

 able range of elasticity. 



The outlines of the plates forming the test are not 

 distinguishable in tests containing the living animal. 



Until quite recently only a few records of this species 

 had been published since it was first described by 

 Leidy in 1879 from New Jersey, U.S.A. 



4. Sphenoderia dentata (Moniez) Penard. 



(Plate XLIII, figs. 14 and 15; and figs. 136-138 

 in text.) 



Sphenoderia lenta 



Lbidt (pars) Freshw. Rhiz. N. Amer. (1879), p. 231, pi. xxxix, f. 40. 

 Euglypha /8 



Vbjdotsky (pars) Thier. Org. Bruanenw. Prag (1882), pp. 38-39, 

 pi. ii, f. 1 J, K. 



