20 



particles agglutinated by an intervening brownish substance, 

 sometimes presents itself of an irregular, or lobcd, or distorted 

 shape, though a broad elliptic figure seems to be more usual; in 

 so far as this goes it is further against its presumed identity 

 ■with Pleurophrtjs spherica. The body of the creature is sus- 

 pended within this test, from which it mostly stands oiF a 

 notable distance, and it is granular. I have not noticed a 

 vacuole, but a large orbicular nucleus is often readily to be 

 perceived, which by some management can be extruded 

 intact. 



The form represented by fig. 2 {Fl. ? umphitremoides) is 

 much smaller, and prone to cover itself with various diatoma- 

 ceous frustules, and in ,the specimens I have met with con- 

 tained numerous chlorophyll granules, but I could not see a 

 nucleu.s. The ramifications of the pseudopodia seem more 

 copious as compared with the preceding, hence the tuft appears 

 more shrub-like. A smaller and nearly orbicular form, seem- 

 ingly the same, is met with without diatomaceous frustules, 

 but covered by large arenaceous particles, this perhaps, after 

 all, equally likely to be the same as PL spherica (Clap, et 

 Laclim.) 



The third form, Avhich I have named from its colour Pleii- 

 rophrys fulva, is far smaller than either the preceding, and 

 is characterised by its tawny hue and the pellucid character 

 of its rough test, owing to its use of clear quartzosc granules. 

 These must be impacted on a basis of that -colour Avhich gives 

 it the tawny hue. I have not seen a nucleus. This is th(^ 

 only one of these forms I have seen " conjugated," in which 

 position pairs are not unfrequently met. 



The character of the pseudopodia in these forms is very 

 like that of the pseudopodia of Dkipkoropodon mobile. I do 

 not mean the long, extravagantly drawn-out ones, but the 

 tufted ones at the sides or after the retraction of the very long 

 ones. The nucleus seen in Fig. 1, too, is very like that of 

 fig. 6, and hence the consideration of the three forms just 

 drawn attention to naturally follows after the latter. 



Amphiirema Wi'ightianum (gen. et. sp. nov.) 



The two drawings presented (fig. 4 and 5), taken along 

 with the explanation of the plate already given, convey, I 

 might say, all I am able to offer upon this curious little form. 

 This rhizopod possesses an elliptic compressed test, bearing- 

 impacted thereon a number of granular foreign particles, each 

 face being comparatively free from these, which are most 

 crowded along the margins and edges. At each opposite end 

 there exists a rounded aperture, through which emanates a 



