RIIlZOrODA. 
480 
grapliia ’ (all of wliich are reproduced), as well as various other species sub- 
sequently established by D’Orbigny. The paper is preceded by a bibliogra- 
phical notice of Soldani’s work. No abstro,ct of the special part of the paper 
can here be given. There are still 263 species enumerated in D’Orbigny ’s 
T ableau, which must lapse for want of any description or reference to iden- 
tify them. 
Pamphagus miitahilis, Bailey. This N.-Ainerican species has been detected 
in Westmeath and Tipperary. It has a large elliptic so-called “nucleus,” 
like that of Amceha, though it is more nearly related to Plagiophrys, W. 
Archer, Q. J. Micr. Sci. xi. p. 101 . 
Arcella. The species have the power of secreting bubbles of gas, which 
enable them to rise to the surface of the water. When the supply is 
exhausted, they sink. T. W. Engelinann, Arch. N^erl. iv. pp. 427-430, 
pi. 7. 
Amceha diffiuens and Arcella vulgaris. The effect produced on their form 
and motions by slight electric discharges is described : id. 1. c. pp. 431-442. 
Amceba tery’icola, Greefl*. On this species, cf. J. Gagliardi, Q. J. Micr. Sci. 
xi. pp. 80-85. He adds that A. Jlava, Greeff, probably = Cory da dujardini) 
and A. hrevipes, Greeff, is probably an incomplete stage of Amphizonella 
digitata. 
On the gradual development of Amoehce in a solution of white of egg, cf. 
G. B. Crivelli and L. Maggi, Bend. 1st. Lomb. (2) iii. pp. 367-376, plate. 
0. Schmidt (“Ueber Ooccolithen und Rhabdolithen,” SB. Ak. Wien, Ixii. 
pp. 669-682, pis. 1 & 2) considers that the discoliths and cyatholiths of 
llackel and Huxley are simply forms of the same organism, the coccolith, but 
that these organisms are independent of JBatkyhius. He describes and figured 
various stages, as well as of a much more simple organism from the Adriatic, 
which he calls Phahdolithes,md considers to be also an independent organism. 
At first it presents the appearance of a short stick, but afterwards develops 
a knob of very variable form at one end. 
On fossil coccoliths and 07'hulince in the Upper Westphalian limestone, 
with remarks on Bathyhius kc,., cf. Von der Marck, SB. Ver. Bheinl. xxviii. 
pp. 60-62. 
The recent observations of Thomson, Huxley, Hackel, and others on 
Coccoliths, BathyhiuSf Myxoh'achia, kc. are noticed. Arch. Sci. Nat. xli. 
pp. 76-78. 
Huxley’s observations on coccoliths noticed by K. Janos, Term. Kdzl. 1860, 
pp. 42&43. 
Spluerozoum sanderij .sp. n., Donitz, Arch. Anat. Rhys. 1871, p. 76, pi. 2, 
Niiples. 
Astromina yelmrtotii, sp. n., J. D. Macdonald, Ann. N. II. (4) viii. p. 226, 
figs. 1 & 2. Lat. 47° 35' N., long. 12” 16' W. ; 2436 fathoms. 
