The Journal of experimental zoology . als. Fig. 2. Medusa with nine rhopalia, the extra one at A occupying an adradial position, at the ter-minus of an adradial canal, unusual in its terminal branching. Fig. 3. Medusa with ten rhopalia, the two extra ones occupying the same perradial segment, at P. Fig. 4. Medusa with only seven rhopalia, one at A being at the terminus of the much curvedadradial canal. At P is shown, at the margin of a complex perradial segment, a very small rhopa-lium. The interradial rhopalium is lacking in the adjacent segment to the left. Fig. 5. Medusa having but three or
The Journal of experimental zoology . als. Fig. 2. Medusa with nine rhopalia, the extra one at A occupying an adradial position, at the ter-minus of an adradial canal, unusual in its terminal branching. Fig. 3. Medusa with ten rhopalia, the two extra ones occupying the same perradial segment, at P. Fig. 4. Medusa with only seven rhopalia, one at A being at the terminus of the much curvedadradial canal. At P is shown, at the margin of a complex perradial segment, a very small rhopa-lium. The interradial rhopalium is lacking in the adjacent segment to the left. Fig. 5. Medusa having but three oral lobes, which were excised before the photograph was made,two of the gonads much smaller, and the umbrella of that side also appreciably narrower. Fig. 6. Hexamerous medusae, having eleven rhopalia, the twelfth at P with the entire perradialsystem of that segment lacking. On the lower right-hand side may be seen the very complex anasto-moses of the canal systems of that region. VARIATIONS AMONG SCYPHOMEDUS^. C. W. Hargitt. PLATE The Journal of Experimental Zoology, vol. ii. AN EXPERIMENTAL STUDY ON THE LIFE-HISTORYOF HYPOTRICHOUS INFUSORIA.^ BY LORANDE LOSS WOODRUFF. With 3 Plates and 12 Figures in the Text. I. Introduction 5^5 n. General Methods and Technique 587 III. Description of the Cultures 59° 1. Oxytricha fallax, Culture A 590 2. Oxytricha fallax, Culture B 594 3. Pleurotricha lanceolata, Culture A 594 4. Pleurotricha lanceolata, Culture B 596 5. Gastrostyla steinii, Culture A 596 IV. Discussion of the Data of the Cultures 601 1. Rhythmical and Cyclical Variation in the Rate of Division 601 2. Artificial Rejuvenescence 605 3. Conjugation 606 V. Physiological and Morphological Variation during the Life-cycle 607 1. Physiological Variation 607 2. Morphological Variation 608 VI. Effect 01 Initial and Daily Stimulation with Salts on the Rate of Division 614 1. Potassium Phosphate (Monobasic and Dibasic) 615 2. Potassium Chlorid and Sodium Chlorid 620 3. Potassium Sul
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