642 
ZOOLOGICAL LITERATURE. 
Stichochcsta pedicidiformis, sp. n., p. 285, fig. 38 a, h. 
Oxytricha Jiava, sp. n., p. 288, figs. 27-29, and O.flava, var. carnea. 
O. rubra (Elirb.), char, emend, p. 291 j O. scutellu7n, sp.n., p. 287. 
Ill, Peritricha. 
Trichodina atierbachii, sp. n., p. 292, figs. 30, 31. 
Acai'dla, g. n., p. 301. Body colourless, rigid, very minute ; anterior por- 
tion obtusely rounded offj posterior portion short, cylindrical, fixed in a 
transparent globular envelope, 'rather broader than the anterior portion. On 
the ring-like border intervening between the two parts a circle of thick-set 
cilia is found, sometimes used for running, and sometimes for leaping. Only 
differs from Ilaltei'ia in the presence of the envelope. 
Codosicjay g. n., Clark, Am. Journ. Sci. 2nd series, Sept. 1866, p. 228, foot- 
note. Body obliquely obovate, and tapering at its posterior end into a slender 
pedicel ; truncate and abruptly constricted in front where the base of the 
bell meets the body. Sigmoid-arcuate flagellum as long as the body and bell. 
The two contractile vesicles in the posterior third of the body, superficial, 
large, and quite conspicuous, each contracting, alternately with the other, 
once in about half a minute. Bodies attached, in groups of from two to eight, 
by their pedicels to the tip of a slender stem ; erect or divergent, but not 
pendent. , Mouth at the base of the flagellum, i. e. terminal. Anus near the 
mouth. No eye-spot. Bell slightly flaring ; half as deep again as broad j 
fully as deep as the length of the body ; highly contractile. Colour of the 
body (excepting the hyaline bell), pedicels, and stem, deep yellow. C. pid- 
cherrima^ sp. n., 1. c. p. 228, common on freshwater weeds about Cambridge, 
U. S. A. 
Diesing (1. c.) proposes the following new genera : — Glenouvella (p. 318) 
for Uvella stiymatica (Perty) j Isomita (p. 321) for Monas dimalii (Joly) ; 
Dimastix (p. 322) for Z). glaucoma (Diesing) ; Plagiomastix (p. 326) for Chilo- 
monas graiudosa (Dujard.) ; Glmopolytoma (p. 331) for Polyto?na oeellatu^n 
(Perty) j Picercoinonas (p. 339) for Monas succisa (Perty) ; Cai'teria (p. 366) 
for Cryptoglena cordifonnis (Carter) ; Calceolus (p. 379) for Pcridmiwn cypri- 
pedium (Clark), yw/e Z. Becord, 1865, p. 791 j Ileteroaidax (p. 381) for Ileterau- 
lacus (Diesing pridem) j Gonyaidax (p. 382) for Peridinium spinifemim (Clap.); 
Glenoaulax (p. 382) for Glenodinium mcequale (Schm.) ; Proaidax (p. 383) for 
Peridinium corpusculum (Perty) ; Pimastigoaulax (p. 392) for Peridmium cor- 
nutum (Ehr.) ; Gymnopharynx (p. 529) for Prorodon edentatus (Clap.) ; Dic- 
tyocoleps (p. 634) for Coleps hirtus (Nitzsch) ; Pinacocoleps (p. 536) for Coleps 
incurvus (Ehrb.) ; Cricocoleps (p. 536) for Coleps amphacantlius (Ehrb.) ; 
CephalorhTjnclius (p. 545) for Trachelius laticeps (Ehrb.) ; Ilyslerocmeta 
(p. 555) for Ptychostomimi paludinarum (Stein) ; Glenotrochila (p. 563) 
for Aegyria oliva (Cl&p.') y Glenojmnoph'ys (p. 84) for OpJn'yoylena Jlavi- 
cans (Ehrb.) ; Aglenophi'ya (p. 86) for Ophryoglena cceca (Stein) ; Cla- 
pai'ediaipp. 98) for Oxyti'ichalotiyicaiidata \ Stemia (p. 113) 
for Oxytricha platystoina (^\\iAi.') ) Nothoplein'otricha (p. 117) iov Pleui'oti'icha 
setifera (Engelmann). 
Clark (/. c.), in treating of the animality of the genus Monas, incidentally 
alludes to, without properly defining, two new genera. Picosceca, p. 323, may 
be described in general terms as a stemless Monas, which is attached to the 
bottom of a calyx by a highly muscular retractile cord. There are two singu- 
larly diverse species of this genus, one marine and the other lacustrine • 
