30 Prot . 
XVIII. PROTOZOA. 
[1904] 
Occurrence of nuclear changes in Opalina ranarum which are thought 
to represent the differentiation of a micro- (or sexual) nucleus, Loewen- 
thal (206). 
Well-differentiated ectoplasmic layer in Trypanophh ; little ectoplasmic 
cap and beak at the anterior end, Keysselitz (156). 
Structure and formation of the trichocysts in Paramoecium , Mitro- 
phanow (239). 
On the discharge of the contractile vacuole in A moeba terricola , Penard 
(261). — The excretory canals of Discophrya , Cohn (77). 
On the hydrostatic apparatus of the Acanthometrea , Sohewiakoff (303). 
Plastogamy in Difflugia urceolata ; detailed account of the chromidial 
substance in this form, Zulzer (369). 
(c) Organs of attachment and movement:— 
Structure of the filamentous pseudopodia of Ghlamydomyxa montana ; 
distinction of the “ travelling corpuscles ” from the nuclei, Penard (260). 
Cuticular stiiations, muscle-fibrillse, etc., in Qregarina ovata , Paehler 
(256). 
The basal corpuscles of Infusoria ( Paramoecium , Garchesium ) are of 
mechanical importance as points of insertion or attachment of the vibratile 
organellce, Mitrophanow (238). 
Structural details of the peristome and ciliary apparatus in Tintinnus , 
Shveier (316). 
Intimate structure of the contractile and fixative apparatus of various 
Vorticellids, Faur£ (95, 98, 99 & 101). In its highest development ( Vorti- 
cella and Garchesium) the peduncle consists of a basal portion or “scopula,” 
an external elastic sheath, and a central contractile axis ; the latter is 
again differentiated into a central “ spasmonema” of united myonemes, 
and an outer plasmic cord. 
On the elastic thread in the stalk of Vorticella , Brandes (39). 
B. Physiology. 
1. Nutrition, excretion, osmosis, etc. 
On the role played by Protozoa in the purification of rivers, by feeding 
on organic material, Bacteria, etc., Weigelt (354). 
Prolonged functional activity and metabolic interchange in Actino- 
sphcerium , brings on “ depression ” and ultimately physiological degenera- 
tion ; analogy between the cellular reactions in such a case, and those 
resulting in malignant growths in Metazoa, Hertwig (138). 
Relations between general metabolism and the process of division in 
Stentor, and the different liquids (solutions of salts, infusions, etc.) in 
which the animals were maintained, Peters (265). 
Hunger-periods associated with conjugation in Dileptus, Hertwig (139). 
The trichocysts of Paramoecium function as an excretory apparatus, 
Mitrophanow (239). 
Investigations on Spirostomum lead to the conclusion that respiration 
goes on only in the cytoplasmic constituent of the cell, and not in the 
nucleus, Verworn (351). 
Adipogenic function in Vorticella convallaria ; associated production of 
a pigment (lipochrome ?) and abundant fat grains, and subsequent expul- 
sion “en masse” ; epidemic occurrence of this “ V. citrina ’’-phase, Faur£ 
( 102 ). 
2. Locomotion. 
Remarks on the movement of Gregarines, Luhe (209). 
Locomotion in Ocyglossa, a new Flagellate, is principally by the con- 
