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Sphaerotheca spores. 115. Spirogyra. 116. Spicules of sponge. 117. Starch. 118. Staurastrum furcigerum. 119. " gracile. 120. Staurogenum quadratum. 121. Surirella. 122. Synchoeta. 123. Synhedra. 124. Tabellaria. 125. Tetraspore. 126. Trachelomonas. 127. Trichodiscus. 128. Uvella. 129. Volvox globator. 130. " sull. 131. Vorticel. 132. Worm fluke. 133. Worm, two tailed. 134. Yeast.
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