. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . the flagellum in the livingcell1. The transverse flagellum of Pyrodinium bahamense is described by 1 In some species of Gymnodinium and Peridinium the thread-like transverse flagellum canbe seen vibrating by gently running in a small quantity of iodine solution or a 2 per cent,solution of osmic acid at one side of the cover-glass. Whenever the living organisms come w. A. ) (56 Peridinieas Plate (06) as a fixed band running round the transvers
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . the flagellum in the livingcell1. The transverse flagellum of Pyrodinium bahamense is described by 1 In some species of Gymnodinium and Peridinium the thread-like transverse flagellum canbe seen vibrating by gently running in a small quantity of iodine solution or a 2 per cent,solution of osmic acid at one side of the cover-glass. Whenever the living organisms come w. A. ) (56 Peridinieas Plate (06) as a fixed band running round the transverse furrow and withboth ends passing into the flagellar pore. The inner fixed border of theband is thickened, whereas the outer border is very delicate, and the move-ment consists of wave-like undulations of this delicate free edge. Lemmer-mann (10) also states that he has on several occasions observed a similarband-like transverse flagellum in the larger species of Peridinium, such asP. bipes, P. Willei, etc. The locomotion of some species of Ceratium and other PeridiniaceaHappears to be intermittent, but Glenodinium will often remain continuously. B Fig. 48. Peridinium Stcinii Jorg. subsp. mediterraneum Kofoid. A, dorsal view of cell showingthe large antapical spines; B, optical section through body of cell; , accessory vacuule;c, c, canals of pusules opening at the flagellar pore which in this species is in a veryposterior position; , collecting pusule; I, leucoplasts; «./>., sack pusule. x 570 (afterKofoid). active for many hours. Some of the Peridiniacese possess trichocyst-likestructures in the peripheral part of their protoplasts, either near the flagellarpore or near the apical pore. In some forms, and particularly in Peridinium Steinii, there is a well-marked pusule apparatus, which was first described by Schtitt (92; 95).This consists of certain peculiar vacuoles in the protoplast, and it isdoubtful if they are present in more than a few forms. In
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