356 W. ARCHER. 



doubt of the correctness of my own observations above referred 

 to, as regards the contraction of the so-called spines of H. 

 marina (or a small colourless form of II. myriopoda ?) and 

 seeming " coagulation" of the outer layer upon lying some 

 time on a slide under " Beale^s fluid." 



As regards the nature of this outer region in general, I 

 would not contend that it is "protoplasmic" or purely sar- 

 codic like the inner body-mass ; it is manifestly of quite a 

 different texture and consistence ; but still it is not " hard," 

 nor containing " hard " constituents, like the spines of 

 Acanthocystis, Raphidiophrys, &c., but comparatively soft 

 and yielding, very much so in the form not externally fim- 

 briated, referred to Heterophrys (perhaps questionably) by 

 me as H. Fockii, and in the form, kindred but not properly 

 falling here, H. varians, Schulze = Helioplirys variabilis, 

 Greeff; in the outer envelope of " typical'^ species of 

 Heterophrys {H. myriopoda, marina, spinifera^ it seems, I 

 venture to think, to differ only, or at least mainly, in being 

 superficially drawn out into those superficial, linear, capil- 

 lary, and acute pointed processes (spines, Hertwig and 

 Lesser). 



In this form the authors did not prove the differentiation 

 of the endo- and ectosarc, but of this there can be no doubt ; 

 it is nucleated (fig. 14, n), as need not be urged ; the ectosarc 

 showed several (as many as four in one individual, and on 

 the side turned towards observation) contractile vacuoles 

 (fig. 14, c, c) ; the pseudopodia extremely long, as much as 

 five times the body diameter, and very finely granular. 



Spharastrum conglohatum, Greeff.i 



seems to be identical with the form I myself previously de- 

 scribed as Heterophrys Fockii.^ As the author's account of 

 it is very short, I venture here to give it in full. " Colonies 

 of Actinophryan Rhizopods, mutually united by sarcode- 

 strings. The individuals have a globular, sharply bounded 

 body, from which the pseudojiodia radiate, mostly not all 

 round, but from such parts of the superficies as are directed 

 outwards. Around the pseudopodia occurs a broad clear 

 sarcode-envelope, as a rule showing a sinus reaching from 

 one pseudopodium to another, and hence surrounding the 

 whole colony like a garland. This outer substance sometimes 

 becomes gathered together about the bases or the apices of 

 one or more of the larger pseudopodia, showing then a 

 peculiar complication of manifold contorted lines. The 



I GreefT, loc. cit., p. 29, t. ii, f. 24— 2G. 



^ Archer, ' Quart. Journ. Micro. Sci.,' vol. ix, p. 113. 



