540 
PROTOZOA. 
Trinema acinus^ Duj., Schultze (11), iii. pp. 104-106, pL v. figs. 9-11 
(= Difflugia enchelys^ Ehrbg.). Differs chiefly from Euglypha by the 
orifice of the shell beiug entire and placed centrally ; Hertwig & Lesser 
(3), pp. 119-121. 
Cyphoderia margaritacea, Schlumb. (Lagynis haltica, M. S.), Schultze 
(11, iii.), pp. 106-113, pi. V. figs. 12-20. - Shell chitinous, but composed 
of small plates of a similar shape to those of Euglypha ; orifice denticulate, 
but with an entire membranaceous rim ; nucleus and pulsatile vacuoles 
present. Also described by Hertwig & Lesser (3), pp. 132-135. Shell 
retort-shaped, composed of regular hexagons, neck obhquely cut, the 
orifice for the pseudopodia, which are ramified, homogeneous and anasto- 
mosing ; numerous contractile vacuoles in the anterior portion of the 
sarcodal body, a single nucleus in the posterior. C. truncata, sp. n., 
Schultze, 1. c. pp. 113-115, pi. v. figs. 21 & 22. 
Flatoujn parvum, g. & sp. nn., Schultze (11, iii.), pp. 115 & 116, pi. vi. 
figs. 1-4. Shell hyaline, structureless, oviform, elastic, with a small 
round orifice at the narrow extremity, not quite filled by the sarcodal 
body, which contains one nucleus and one or two small pulsatile vacuoles 
(Baltic). 
Actinolopkus pedunculatus, g. & sp. nn., Schultze (11, iii.), pp. 392-398, 
pi. xxvii. figs. 1-9. Allied to LecythiUj^v.^ov Zooteira,Wi\ ?. Fixed by 
a longitudinally striated stem to Hydroida ov Algw] sarcodal body 
typically pyriform, with pseudopodia only on the distal portion, no 
contractile vacuole, a single nucleus ; the pseudopodia are imperfectly 
retractile, perhaps because the body is surrounded by an invisible layer, 
though apparently naked. Other specimens are really enclosed, body 
and stem, in a distinct gelatinous covering, on the surface of which 
small, hexagonal siliceous plates are developed ; the pseudopodia are 
subsequently withdrawn, the nucleus divided, the stem shortened, &c. 
(Baltic). 
Pleurophrys ampkitrematoideSj Arch., Schultze (11, iii.), pp. 123 & 124, 
pi. vii. fig. 1 ; P.fulva, Arch., id. 1. c. pp. 124 & 125, pi. vii. figs. 2 & 3 ; 
P. compressa^ sp. n., id. 1. c. p. 125, pi. vii. figs. 4 & 5 ; P. lageniformis, 
sp. n., id. 1. c. pp. 125 & 126, pi. vii. figs. 6-8 (Baltic). No chlorophyll 
in P. amphitrematoides ] conjugation with shell orifices in apposition not 
uncommon. P. sphoarica^ Cl. & Lni. ; Hertwig & Lesser (3), pp. 135-137, 
pi. iii. fig. 4. Shell irregularly oval, formed of small siliceous bodies con- 
nected by an organic cement ; nucleus present ; pseudopodia thin, granu- 
ligerous, ramified and anastomosing. 
Diplophrys archeri, Bark. ; Schultze (11, iii.), pp. 127-132, pi. vii. figs. 
10-15. Single or in colonies {Cystophrys oculea, Arch.), probably pro- 
duced by fission (Greeff, 1, pp. 14-16). Also described by Hertwig & 
Lesser (3), pp. 139-145, pi. iii. fig. 3. Shell roundish or ovoid, smooth, 
covering the body immediately, with two, not quite opposite, orifices for 
the pseudopodial stems ; pseudopodia homogeneous, rarely branched, not 
anastomosing ; nucleus central ; several contractile vacuoles ; one large 
or several smaller fat-like globules. 
Microgromia (g. u.) socialis, Hertwig (2) (= Cystophrys hcBckeliana and 
Gromia socialis, Arch.), occurs in a double shape ; the individual cells 
