6 BRITISH FRESHWATER RHIZOPODA. 



The two last-named species have not been recorded 

 from the British Isles. 



The aperture-scales are either pointed, denticulated, 

 or serrated ; they are distinctive of and usually con- 

 stant in each species and are typical of the genus 

 Euglypha. 



Both scales and spines consist principally, if not 

 entirely, of silica and are secreted within the body of 

 the animal; they are insoluble in boiling sulphuric 

 acid and readily- dissolved by caustic potash. The 

 material with which they are cemented together is 

 dissolved by boiling, but not by cold, sulphuric acid. 



The nuclei have some specific value, but the plasma 

 and pseudopodia are very similar in most species of 

 the genus. 



The Euglyphse are vegetable feeders and are among 

 the most widely distributed of the Rhizopoda; they 

 are generally abundant in most kinds of mosses, in 

 sphagnum, and in submerged vegetation. 



Synopsis op the British Species. 



DIVISION I. — Spines when present always modified scales. 

 Transverse section circular (except in E. 

 hryophila). Aperture circular and may 

 have two rows of aperture-scales. 



Test glabrous ; body-scales scutiform ; length 75-90 fi. 



(1) E. scutigera. 



Test bearing a few stout spines on the fundus; body-scales 

 elliptical ; length 55-80 ;u. (2) E. acanthophora. 



Test glabrous ; body-scales circular or oval ; length 45- 

 100^. (3) E. tiiherculafa. 



Test elongate, with a tuft of spines on the apex ; length 

 33-70 fi. (4) E. cristata. 



Test elongate, fundus conical, apex with one or two 

 terminal spines ; length 100-140 /u. (5) E. mucronata. 



Test elongate, with a few long spines near the aperture ; 

 length 92-128 ;u. {&) E.bracMata. 



Test oviform, slightly compressed, apex with a tuft of 

 spines; length .35-52 /z. (7) E. bryopMla. 



