. The biology of the Protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 269 the groove approaches the anterior end and finally disappears entirely from the cell. In Prorocentnim (Fig. 129, A) there is an anterior spur-like process about which the transverse flagellum vibrates as though in a groove, while in Exuimlla even this spur is absent but the flagellum vibrates in a plane at right angles to the. Fig. 129.—Types of Diiioflagellida. A, Prorocentrum micans; B, ExuviwUa marina; C, Gyrodinium ovum; D, Gyinnodinium sphcericum; E, Pcridinium divergens. (A, after Blitschli; B,
. The biology of the Protozoa. Protozoa; Protozoa. MORPHOLOGY AND TAXONOMY OF MASTIGOPHORA 269 the groove approaches the anterior end and finally disappears entirely from the cell. In Prorocentnim (Fig. 129, A) there is an anterior spur-like process about which the transverse flagellum vibrates as though in a groove, while in Exuimlla even this spur is absent but the flagellum vibrates in a plane at right angles to the. Fig. 129.—Types of Diiioflagellida. A, Prorocentrum micans; B, ExuviwUa marina; C, Gyrodinium ovum; D, Gyinnodinium sphcericum; E, Pcridinium divergens. (A, after Blitschli; B, to E after Calkins.) long axis of the cell as though in an imaginary furrow (Fig. 129, B). It seems highly improbable that such a peculiar mode of flagellar vibration is evidence of a primitive form of Dinoflagellates and more reasonable to regard these types as secondarily simplified organisms derived from the Dinophysidse, a derivation further evidenced by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. Philadelphia, New York, Lea & Febiger
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