XVIII. PROTOZOA. 
20 Prot. 
264. Zoja, R. Sulle sostanze cromatofilo del nuclco di alcuni Ciliati 
Boll, scient. xiv, No. 4, pp. 107-117. 
265. . Sulle sostanze cromatofile del nucleo dei Succhiatori e 
Flagellati. Op. tit. xv, No. 1, p. 18. 
266. . Contribuzioue alia studio delle sostanze cromatofile nucleari 
di Auerbach in alcuni Ciliati, nella ovogenesi e nella fecondazione 
dell’ A scar is megalocephala , nella uova partenogenetiche dell’ Aphis 
rosie. T. c. pp. 50-60 & 64-69. 
II. — MORPHOLOGY AND PHYSIOLOGY. 
1. Anatomy. 
Blociimann (15) has discovered numerous fine protoplasmic threads 
projecting from the surface of Pelomyxu. 
Blociimann (17) proves the existence of axial threads in Dimorplia 
mu tans, which, like the flagella, converge radially towards the nucleus. 
The nucleus, too, has a radial structure, flagella and axial threads 
springing from its centre. This author establishes a new genus, Dima - 
8tigamcsba } which differs from Dimorplia by the Bhizopoda-Mke pseudo- 
podia, and the arrangement of the flagella. The Rhizomastigina are 
Flagellata , contrary to Frenzel’s views. 
Eggeb (54) has an important monograph on the Foraminifera collected 
during the voyage of the German corvette “ Gazelle,” in the Atlantic, 
Indian, and Pacific Oceans, during the years 1874-76. 490 species are 
described, of which 46 are new\ The w r ork is illustrated by 21 plates 
and 1 map. 
Franz£ (62) has studied the stigmata or eye-spots of the Euglenoidina 
Chlamydomadina , and Volvocince. They consist of a disc of a plasmatic, 
fine-meshed ground substance, containing oily red granules. The centre 
of the disc is occupied by a crystalline body, surrounded by a number of 
lens-bodies. The stigmata serve for the perception of light and heat. 
Moore (155) has studied the structural differentiation of the Protozoa 
by microscopic sections. Spirostomum showed a splendid reticulum of 
the whole protoplasmic body, and, near the oral furrow, a structure 
which suggests a nervous apparatus. Paramcecium showed much less 
differentiation. 
Rhumbler (185) has a paper on the origin and significance of certain 
small bodies which occur in the nucleus of many Protozoa , and in the 
germinal vesicle of Metazoa. They are probably not organized struc- 
tures, but reserve material. 
Rhumbler (186), describing Saccammina sphcerica , states that the 
sand grains constituting the shell are connected by a cementing sub- 
stance along the lines of contact only. When growing, certain parts of 
the shell are broken open, and are rebuilt by the pushing in of new sand 
grains. Sarcode and nucleus are also described. 
