EXPLANATION OF THE PLATES. 



(IT) 



Fig. 11. One of the crystalline lenses of fig. 7, seen 

 from the flat or inner end, showing its polyhedral out- 

 line and the branching cavity, a the wall of the cell 

 which belongs to the outer wall of the ])cMluncle and 

 overlies the cell which contains the lens ; it is seen 

 in the distance (see a fig. Ifi) ; <5 tlic flat side of the 

 prism foreshortened, and as the outer end is broader 

 than the Inner, the outline of the latter is concentric 

 to that of the fijrnici- ; 9 the solid part of the lens, 

 to compare with in fig. 10; (to compare with ( in 

 fig. 10 ; II the diverticuli from the cavity i', in the 

 centre. 2,000 diameters. 



Fig. 12. One of the lappets of an oculiferous lobe of 

 fig. 4, curved downwards, so as to give a sectional 

 view of its thickness, and to show the keel. 100 

 diameters. 



Fig. 13. Transverse section of the simple radiating canal 

 (e ('? fig. 1 7), and the two canals on each side which 

 come from the forked canal (c, fig. 17); ra, /3, groups 

 of long-di'awn-out cells, remnants of the attachment of 

 the superposed walls. 100 diameters. 



Fig. 14. End view of the so-called eye-speck /(, fig. 7. 

 .500 diameters. 



Fig. 15. Profile and sectional view of fig. 7. .'500 

 diameters. 



Fig. IC. Shows the position of the crystalline lenses in 

 the cells of the inner wall of the ocular peduncle. 

 a a .superposed cell of the outer wall (see fig. 11 a) ; 

 /3 the wall of a where it rests on the outer end, J, 

 of the underlying cell ; y the clear, homogeneous con- 

 tents of a ; (S the outer end of the lens-bearing cell ; 

 £ the cavity of n in front of the lens ; f the inner 

 end or bottom of »/ ; 9 the side of the prism receding 

 from the eye ; i the side of the prism nearest the 

 eye; k the rounded anterior surface of the lens; /"i 

 the cylindrical a.\ial cavity of the lens ; fi the canals 

 radiating from A and following close to tlie Hat pos- 

 terior face of the lens ; v posterior opening of 2. 

 2,000 diameters. 



Fig. 16"'. A lasso-cell from fig. 7. a the cell wall; h 

 the aperture of the cell and base of the thread ; r 

 the end of the thread ; d point of jvmction between 

 the straight axial portion and the coils of the thread ; 

 e the first coil of the spiral ; / the transversely spiral 

 coils. 2,o00 diameters. 



Fig. 17. A cpiarter part of the disk of fig. IR, seen 

 from Ijclow. There are fourteen tentacles. The 

 branching radiating canals are nearly or altogether 

 six pronged, and the edge of the disk occupies two 

 thirds of the circumference. 40 diameters. Next the 



oculiferous lobe on the right, the veil and the tenta- 

 cles are curved downwards and inwards. 



Fig. 18. An ephyra, seen from below. Natural size. 



Fig. 19. One of the marginal fringes of fig. G, PI. XI^. 

 (7 the end, where the wall is thickened and contains 

 numerous lasso-cells ; h group of lasso-cells ; c the 

 same as h in profile. 200 diameters. 



Fig. 20. Profile of an ephyra, with the disk expanded, 

 the same as fig. h. Natural .size. (See PI. XI<^. fig. .5.) 



Fig. 21. One of the digitate bodies of fig. 18 e, PI. 

 XI". o the single wall studded with lasso-cells ; /3 

 the inner wall of the lower floor from which a arises ; 

 7 the entrance to a. 300 diameters. 



AURELI.*. FL.WIDUL.^ (eI>HYR.\) AND CuKYNE 



y\\\\s.v.uA^. 

 [Drawn troni nature by H. J. Clark.] 



For the general lettering, see description of PI. XI. 



Fig. 1. A tentacle from the edge of the disk of fig. 

 0. (I (7' (C- the outer wall, seen in a sectional view 

 («) near the end of the tentacle, in a surface view 

 ((('), and again in section where it is very thick (n") 

 and contains a group of lasso-cells, and finally where 

 it is stretched so as to be very thin («') ; 6 the inner 

 wall near the end of the tentacle ; i' seen through 

 f(', in a sectional view {Ir) underneath a group of 

 lasso-cells, and extremely extended (6') like a"; c the 

 end of the tentacle in section, crowded with lasso- 

 cells ; c' a group of lasso-cells in section ; d d the 

 channel extending from base to tip directly from the 

 circular canal ; c groups of lasso-cells. 500 diameters. 



Fig. 2. View from above of the eye and the immedi- 

 ately surrounding parts of the disk, from an ephyra 

 an inch and a half in diameter and having fifty ten- 

 tacles ; principally to show the prolongation of the 

 chymifcrous tube into the lappets of the oculiferous 

 lol.ic, and the mode of formation and broadening of the 

 radiating canals. 40 diameters. 



Fig. 3. View from above of a portion of the tentaculate 

 margin and the veil, from fig. 18, PI. XI''. Beside 

 the general lettering we have a the outer and {) the 

 inner wall of ? ; -/ the outer wall of /' where it 

 pas.ses into the outer wall (f) of r ; (i the inner wall 

 of P where it passes into the inner wall of r; f the 

 outer wall of r ; f the inner wall of r seen in the 

 distance ; '; the inner wall of i' nearer to the e)-e 



