310 MR. G. 8. WEST ON SOME BRITISH 
5. Petomyxa vittosa, Leidy, Freshw. Rhiz. N. Amer. 1879, 
p- 73, t. v., t. vill. ff. 31-33.—Ameeba sabulosa, Leidy, 1874. 
Terrington, N. Yorkshire, in ditches. Devil’s Jumps, Frens- 
ham, Surrey, in bog-pools. Ashurst Bog, New Forest, Hants. 
This is a smaller animal than P. palustris, Greeff, and possesses 
a terminal villous patch similar to that of Ameba villosa. 
Gen. DacryLospuamrium, Hertwig & Lesser. 
6. DacryLosPpH#RIUM RADIOSUM, Blochmann, Die mikr. Thier- 
welt des Susswass., 1. Protozoa, Hamburg, 1895, p. 14.—Ameeba 
radiosa, Hhrenb. Abh. Akad. Wiss. Berlin, 1830, p. 80; Infus. 
1838, p. 128, t. vii. f. xiii; Carter, in Ann. Mag. Nat. Hist. 
1856, p. 243, t. v. ff. 10-18; Letdy, Freshw. Rhiz. N. Amer. 
1879, p. 58, t. iv. ff. 1-18. A. brachiata, Dujardin, 1841. A. 
ramosa, Duy., 1841. 
General in pools or heaths, and in bogs and pools in hilly 
districts. 
A peculiar form was very abundant in the pools on Esher 
West-end Common, Surrey, in Feb. 1894. It had a spherical 
body of 12-19 w in diameter, and five (sometimes six) long, 
attenuated pseudopodia. Length of pseudopodia 25-54 yp. I 
could find no trace of this form in the same locality in either of 
the two following years. (Pl. 28. fig. 5.) 
The usual mountain form of the animal possesses a subspherical 
or ellipsoidal body, 32-50 p in diameter, and from twelve to 
twenty long and exceedingly narrow pseudopodia. Length of 
pseudopodia 25-70 p. 
An extraordinary form was met with from Llyn Idwal, 
N. Wales. The body was more or less polygonal, 27-34 mu in 
diameter, and the pseudopodia were six in number, very slender, 
and of extraordinary length (52-107 p). (PI. 28. fig. 4.) 
7. DACTYLOSPHERIUM VITREUM, Hertwig & Lesser, in Archiv 
Sir mikr. Anat. 1874, x. Suppl. p. 54, t. 1. f. 1. 
Shelf, West Yorkshire. Diameter of body 48-54 mu; length 
of pseudopodia 29-48 p. 
All the animals possessed numerous radiating pseudopodia, 
seemingly entirely composed of the ectoplasm, the endoplasm 
extending a short way into their expanded bases. The ectoplasm 
