lUHZOroUA. 
539 
in rains or wet7wcather. Gromia oviformis, Dnj., Schultze (11, iii.), 
p. 1 10 (Tlaltic) ; G. (jrnmilata^ sp. n., id. /. c. pp. 117 118, pi. vi. figs. 5 
& 0; G. socialh^ Cart., n/. /. e. pp. 118-122, pi. vi. figs. 7-13 (sovoral 
individuals often unite, forming “colonies” through fusion of their 
pseudopodia). Absence of contractile vacuole confirmed. 
Arcella vulgaris , E. ; Hertwig Sz. Lesser (3), pp. 96-99. Shell disc- or 
shield-shaped, formed of two parallel plates, connected by a hexagonal 
meshwork ; pseudopodial orifice central, inferior ; numerous nuclei and 
contractile vacuoles. ^ 
Pseudochlamys jiatella, Cl. & Lm. ; iid. 1. c. pp. 100-103, pi. iii. fig. 1. 
Shell roundish, shield- shaped, the concavity closed by a thin membrane, 
with the exception of a central orifice for the pseudopodia, which are 
finger-shaped and homogeneous ; sarcodal body discoid, with an almost 
central nucleus and nnmerous peripheral contractile vacuoles. 
Pyxidicula operculata (Ehrb.) {Arcella patens.^ Cl. & L.) ; iid. 1. c. pp. 
103-105. Shell discoid, irregularly tuberculated, upper aboral portion 
convex, lower surface chiefly occupied by the orifice for the pseudo- 
podia ; sarcodal body discoid, with a single nucleus and numerous con- 
tractile vacuoles. 
Plagioj)Jirys cylindrica, Cl. & Lm. ; Schultze (11, iii.), p. 126, pi. vii. fig. 9. 
P. sacciformis and scutiformis^ spp. nn., Hertwig & Lesser (3), pp. 
113-117, pi. iii. figs. 2 & 3. Shell thin, membranaceous, somewhat pliable, 
covering the body immediately ; nucleus single, no contractile vacuoles ; 
pseudopodia pointed, branched, not anastomosing. 
Lecythium (g. n.) hyalinum (Schlmb.), Hertwig & Lesser (3), pp. 117 & 
118, pi. iii. fig. 8. Shell roundish, hyaline, thin, membranaceous, not 
pliable, symmetrical, with a short neck in which is the pseudopodial 
orifice; psoudopodia homogeneous, highly ramified, sometimes anasto- 
mosing ; sarcodal body filling the shell, anterior portion granulated with 
numerous non-contractile vacuoles, posterior homogeneous, containing 
a single nucleus. 
Euglypha alveolata, Duj., Schultze (11, iii.), pp. 97-101, pi. v. figs. 1 & 2 ; 
E. compressa, Carter, id. 1. c. pp. 101 & 102, pi. v. figs. 3 & 4 ; J5J. glo- 
bosa, C., id. l. c. pp. 102-104, pi. v. figs. 5-8 (= Sphenoderia^ Schlmb. ?). 
One or more pulsatile vacuoles and a single nucleus are present ; the 
shell is composed of circular or oblong, small, imbricate, siliceous plates, 
those limiting the orifice often denticulate ; the entire membranaceous 
orifice which sometimes occurs in specimens of E. glohosa, in which no 
pseudopodia are observable, is perhaps an indication of a quiescent state 
of the animal. E. glohosa and alveolata^ and E. ampullacea., sp. n., are also 
described by Hertwig & Lesser (3), pp. 121-132, pi iii. figs. 5-7. The 
plates are here described as hexagonal. In the encysted Euglypha, i\\Q 
orifice of the shell is closed by foreign matter, and the body surrounded 
by an oblong tessellated and closed shell and an inner puucfcuhite 
siliceous capsule. “ Shell ovoid or flask-shaped, composed of hexagonal 
plates, arranged in regular spirals, with the pseudopodial orifice at the 
extremity; pseudopodia homogeneous, ramose, not anastomosing ; an- 
terior portion of the sarcodal body granular, posterior homogeneous 
with a single nucleus; contractile vacuoles between both portions.” 
