EXPLANATION OF THE PLATES. 



(15) 



c ; c' entrance to c ; c' end of c ; c ° chymiferous canal 

 in the peduncle of the eye; d ridge of c; d' fork 

 of il\ d' floor of c; e chymiferous canal to the ten- 

 tacles ; e' lateral branch of e ; e' inner wall ; e' en- 

 trance to e ; / ridge of e ; g sexual appendages ; g^ 

 common opening ot g\ g° second row of appendages ; 

 (7' common opening of </' ; g^ exterior pouch ; k eye ; 

 h^ outer wall of h ; h' inner wall of A ; //' base of 

 h ; h* facets of eyes ; h^ base of h above ; /('' l)ase of 

 facet 7t* ; /«' centre of h ; A' lateral base of Ji ; i i' 

 veil; i' marginal lobules; i* tentacle, or tentacular 

 lobe ; J* inner wall above ; ? inner wall below ; !° 

 outer wall above ; P outer wall below ; ? lower side 

 of the veil ; P edge of the disk ; / ocuUferous lobe ; 

 y lappets of J ; /- ridge of f ; /■' riilge in transverse 

 section ; /* back of the lappet ; /* edge of j above ; 

 y outer wall above ; f inner wall above ; j' inner 

 wall below ; J^ outer wall below ; k partitions between 

 canals ; k^ partially isolated partition ; l^ an insular 

 partition ; / the disk ; l^ axis of the strobila ; /- axis 

 of the disk ; jn muscular ring, iimer edge ; n;' outer 

 edge of III ; mc marginal canal ; aj edge of lobe /, 

 below ; /;/ commsisure of lappets _;'' ; cj depression at 

 the base of hj \ dj fold of the lappet below. 



Fig. 1. The lowest ephyrse of a strobila which has already 

 lost the upper ones, ready to drop; they are drawn 

 here whilst in the systole of one of their convulsive 

 contractions, by which they break loose, and the 

 remains of the seyphostoma has its fidly developed ten- 

 tacles extended to the utmost. 



Fig. 2. The remains of a seyphostoma, showing the off- 

 shoots. 



Fig. 3. Another old seyphostoma, with a few distorted 

 ephyra?. 



Fig. 4. An old seyphostoma, with distorted tentacles, and 

 a few nearly mature ephjTa?. 



Fig. ■>. The base of a column of ephyras, and a sey- 

 phostoma with eye spots, h, at the base of the ten- 

 tacles. 



Fig. G. A seyphostoma, with its second row of tentacles, 

 bearing a column of thirteen ephjTa; in various stages 

 of development. 



Fig. 7. A seyphostoma with twenty tentacles, probably 

 belonging to the second gi-oup fonned after the fall 

 of the ephyrae. 



Fig. 7a. Proboscis of fig. 7. 20 iliametcrs. 



Fig. 8. Interior view of the edge of the ephyra of fig. 

 14. 30 diameters. 



Fig. 9. The phcated lip of the proboscis of fig. 13 /. 

 30 diameters. 



Fig. 1 0. A yomig strobila, still incomplete ; the terminal 

 ephyra has the deciduous false tentacles. 



Fig. 11. A strobila casting its last ephyra. 



Fig. 1 2. The base of a double strobila, formed by trans- 

 verse division of the discs B and C. 



Fig. 13. The last ephyra just ready to drop. 



Fig. 14. The last and youngest of a pile of ephyra, 

 bearing sixteen deciduous, false tentacles. 



Fig. 15. An incipient pile of ephyrse, the terminal one 

 bearing si.xteen deciduous tentacles. 



Fig. IG. An old strobila, the terminal ephyra bearing 

 si.xteen deciduous tentacles, and the seyphostoma having 

 two rows of tentacles. 



Fig. 17. The three oldest ephyra; are nearly mature, 

 whilst tlie fourth is far behind in age. 



Fig. 1 8. An old seyphostoma with three rows of ten- 

 tacles. 



Fig. 19. The terminal ephyra shows the homologies be- 

 tween the tentacles of the seyphostoma and the ocu- 

 liferous lobes and eye-peduncles of the ephyra. 



Fig. 20. One of the ephjT-a; of fig. 1 0. 



Fig. 21. Scyphostoma-like ephyric, similar to figs. 18 

 and 19. 



Fig. 22. A form combining the features of fig. \b and 

 fig. 21. 



Fig. 23. A double ocuUferous lobe from an ephyra of 

 fig. 29. 30 diameters. 



Fig. 24. A portion of the disk of one of the ephyra- 

 of fig. 29. 20 diameters. 



Fig. 2.5. A mass of monstrosities both of the ep!iyra> 

 and seyphostoma. 



Fig. 2G. Proboscis and sexual appendages of fig. 11, 1. 



I'here is no fig. 27. It was omitted in numbering the 

 ])late. 



Fig. 28. A terminal ephyra with branching deciduous 

 tentacles. 



Fig. 29. Shows an ephyra just escaping from its a.xial 

 attachment, which passes into the proboscis of the next 

 lower individual. 



PLATE XI^ 



•ScYrilOSTOM.*. AND EPHYRA OF AuRELIA FLAVIDVLA. 



[All the figures drawn from nature by A. Sonrel.] 



Unless wdien otherwise stated, the figures are magnified 

 1.5 diameters. For the lettering, see PI. XI. 



Fig. 1. An old seyphostoma attached by a lateral pro- 

 cess of its base. 



