Opalina : its anatomy and reproduction, with a decription of infection experiments and a chronological review of the literature . beat backward, the animal thus turning over to theright as it swims; he describes and analyzes the reactions of thecilia under electric stimulation, which cause the animal with a weakcurrent to swim forward tot\ardthe anode, with a stronger currentto swim forward towai-d thekathode, with a still strongercun-ent to swim backward orsidways toward the anode. Maiek (1903) describes care-fully for 0. ranarum the pellicula,and the cilia and their basalgranules. He denies
Opalina : its anatomy and reproduction, with a decription of infection experiments and a chronological review of the literature . beat backward, the animal thus turning over to theright as it swims; he describes and analyzes the reactions of thecilia under electric stimulation, which cause the animal with a weakcurrent to swim forward tot\ardthe anode, with a stronger currentto swim forward towai-d thekathode, with a still strongercun-ent to swim backward orsidways toward the anode. Maiek (1903) describes care-fully for 0. ranarum the pellicula,and the cilia and their basalgranules. He denies the connec-tion of the cilia with a networkof subcuticular fibrils such asToNNioEs describes, ascribing theappearance of the transverse linesobserved to ridges in the pellicle.[My study confirms Tonniges asto the presence of a sub-pellicularnetwork in connection with thecilia, though I would not ascribethe movement of the cilia to thecontraction of the fibrils of thenetwork. The network seemsmore likely to be useful for thecoordination of the movements ofthe Maiek opposes ToiNNKiEsdescription of the alveolar struc-. Text Fig. XVI. VVallengrens figure of 0. ranarum,illustrating the direction of the motionof the cilia waves (plain arrows) andthe direction in which the animal turns(feathered arrow). The* dotted linesacross the hody do not indicate thelines of insertion of the cilia but thewaves of contraction of the cilia. WhatI interpret as the morphological anteriorend stretches form -j- to -[- and is in-dicated by the dotted index line. 336 ^1- ^I Metcalf ture of the refractive spherules, saying tliey are homogeneous.[Bezzenberger and I confirm Tonniges.] Maier opposes Tonnigesdescription of the ectoplasma as containing large alveoles, sayingthat its alveoles are as small as those of the endoplasma. [My workconfirms Tonniges.] Veneziani (1904) divided cultures of 0. ranarum into twoexactly equal parts and placed a tube containing Vj„ gram of activeradium bromide in on
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