458 TUFTS COLLEGE STUDIES, VOL. II, No. 3 



50. Schizochlamys gelatinosa, recently divided cell, after West. 



500 X i. 



51. Elakatothrix americana, mother and daughter cells, after 



Snow. 800 X i. 



52. Hormotila mucigena, after West. 500 X i. 



53. Scenedesmus obliquus, after Nageli. 500 X i. 



54. Crucigenia rectangularis, after West. 600 X i. 



55. Selenastrum minutum, after Nageli. 1000 X i. 



56. Kirchneriella lunaris, after Bohlin. 800 X i. 



57. Coelastrum cambricum, after West. 800 X i. 



58. Sorastrum spinulosura, after Nageli. 500 X i. 



59. Dictyosphaerium Ehrenbergianum, after Nageli. 600 X i. 



60. Dimorphococcus cordatus, after Wolle. 500 X i. 



61. Dictyocystis Hitchcockii, after Wolle. 600 X i. 



62. Hydrodictyon reticulatum, young colony in mother cell, 



after Klebs. 100 X i. 



63. Pediastrum Boryanum, after Nageli. 800 X i. 



64. Uiothrix zonata, vegetative, after Hazen. 300 X i. 



65. Hormospora purpurea, after Wolle. 300 X i. 



PLATE VII. 



66. Uronema confervicola, after Lagerheim. 800 X i. 



67. Schizomeris Leibleinii, after Hansgirg. 60 X i. 



68. Microspora tumidula, akinetes in formation, after Hazen. 



500 X i. 



69. Stichococcus bacillaris, after Nageli. 800 X i. 



70. Enteromorpha erecta, surface view, after Collins. 200X1. 



71. Ilea fulvescens, surface view, after Collins. 200 X i. 



72. Monostroma fuscum, cross section, after Collins. 200 X i. 



73. Protoderma viride, surface view, after Rabenhorst. 



600 X i. 



74. Radiofilum apicttlaturn, surface view, after Bohlin. 800X1 



75. Ulva L,actuca, cross section, after Thuret. 300 X i. 



76. Schizogonium crenulatum, surface view, after Gay. 



1000 X i. 



77. Prasiola crispa, mature frond, after Oltmanns. 100 X i. 



