aT 
Variation in Ephyree of Aurelia aurita. 23 
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EXPLANATION OF FIGURES 1-12. 
All the forms semi-diagrammatically represented were produced from strobila No. 8. 
Fig: 1. “Twin” tentaculocysts on three interradial arms. 
» 2 “Twin” tentaculocysts on one interradial arm, with hint of lappet between, 
5 o. Twin” tentaculocysts on two interradial arms; one pair of gastric filaments 
doubled. 
» 4. Two adjacent interradial arms doubled, also “twin” tentaculocysts on another 
interradial. 
. 5. Two tentaculocysts missing (adjacent arms). 
,, 6. Tentaculocysts missing from two opposite perradial and also from one interradial 
arm, 
,, 7. Three interradial arms imperfectly doubled, the fourth represented by ‘‘twin” 
tentaculocysts, the lobes being practically absent. 
, 8. Three interradial arms imperfectly doubled; one component of one interradial 
represented by tentaculocyst only, the lobe being absent ; component of another 
without a tentaculocyst. 
» 9. Four interradial arms imperfectly doubled. 
,, 10. Four interradial arms imperfectly doubled ; two opposite pairs of gastric filaments 
doubled and “twin” tentaculocysts in both components of corresponding arms. 
» Ll. One interradial imperfectly doubled; other interradials imperfect; only three 
single gastric filaments opposite one interradial arm. 
, 12. Four interradial arms imperfectly doubled and without tentaculocysts except in 
components of two (opposite) arms, Only two (opposite) pairs of gastric 
filaments present. 
REFERENCES. 
Browne, E. T., 1895. On the Variation of the Tentaculocysts of Aurelia aurita, 
Quart. Journ. Mier. Sc., vol. xxxvil. pp. 245-251 (with 1 plate). 
, 1901. Variation in Aurelia aurita. Biometrika, vol. i. pp. 90-108 
(with 3 text-figs.), 
Hareitt, C. W., 1905. Variations in Scyphomeduse, Journal of Experimental 
Zoology, vol. 11. pp. 547-582 (one plate and 17 text-figs.). _ 
M‘Intosu, D. C., 1910. Variation in Aurelia. aurita, Proc. Roy. Phys. Soc., 
idin., vol. xviii,, No. 2, pp. 125.143. 
(Issued separately, 6th May 1921.) 
VOL. XX. 
