PARMULINA OYATHUS. 29 
Length 40-55 u. 
Habitat.—Mosses. 
Scortanp.—Perthshire (Brown). 
Ire.anp.—Louisburgh and Achill Island, Mayo 
(Penard). 
The test is of a greyish or yellowish colour and too 
opaque for the plasma to be clearly visible m the 
living animal. No pseudopodia have been observed, 
but the plasma often protrudes in a lobular form. 
Genus 16a. CAPSELLINA Penard, 1909. 
Capsellina Punarp in Arch. Protist. XVII (1909), p. 290. 
Body enclosed in a hyaline, ovoid, membranous sac, 
with or without a second outer testaceous covering ; 
aperture single, terminal, linear ; nucleus single, placed 
posteriorly ; one or more contractile vesicles ; pseudo- 
podia filose. Multiplication takes place by division. 
Only two species belonging to this genus have been 
described; C. bryorum Penard has in addition to the 
inner membranous sac a dark brown outer test 
similar in shape, composed of a membrane covered 
with fine silicious or chitinous particles; it is 35-46 yu 
in length. C. timida Brown has no outer envelope 
and is the only species recorded, so far, from the 
British Isles. 
Multiplication in C0. bryorum takes place by binary 
fission accompanied by the longitudinal division of the 
envelopes. 
1. Capsellina timida Brown. 
(Plate LVIII, fig. 8; Pl. LIX, figs. 10-14.) 
Capsellina timida 
Brown in Jrn. Linn. Soc., Zool. XXXII (1911), pp. 80-82, pl. ix, 
ff. 9-13; in Scott. Natur. 1912, pp. 112, 1138; in Naturalist, 1912, 
p. 181. 
Test small, ovoid, membranous, hyaline; longitu- 
dinal section oval; transverse section elliptical; aper- 
