BULLETIN OF THE 
Fig. 8. An octant of the disk of Cyanea showing the early condition of the chymif- 
erous tubes, the sexual filaments, and the bundles of marginal tentacles. 
Fig. 9. Octant of the ephyra of C. arctica (oral view). 
s. Single sexual filament. 
Fig, 10. Still more developed ephyra of the same (oral view). 
lig. 11. Aboral view of the region of the bell margin in which the sense organ is 
situated (Cyanea). 
Fig. 12. Marginal sense organ of Cyanea. 
c. Single curtain hanging down on the left-hand side of the otocyst. 
Fig. 12%, Hood covering the otocyst on aboral side. 
Fig. 13. Sexual organs and sexual filaments of Cyanea (female). 
Fig. 14. Peculiar sense organ (2) on the under side of the peduncle of the marginal 
sense organ of Cyanea. 
PLATE VIII. 
Fig. 1. Mnemiopsis Leidy, expanded, life size. 
Fig. 2. The same, contracted and seen in a plane at right angles to Fig. 1. 
a. Sense pockets of the tentacle. 
h. Vibratile plate. 
4. Intestine, with surrounding glands. 
j. Rudimentary tentacle. 
1. Vibratile combs. 
Fig. 3. Young of Fig. 1 (Mnemiopsis 
Fig. 4. Side view of the same. 
Fig. 5. Aboral view of the young of M. Leidyi 
in Figs. 3, 4. 
Fig. 5”. Sense area of young Mnemiopsis. 
Fig. 6. Sense organ, with nerves (d) of adult Mnemiopsis. 
Fig. 7. Rudimentary tentacle of a young Mnemiopsis. 
8. Rudimentary tentacle of the adult of the same. 
a. Sense pockets. 
b. Chymiferous tube. 
d. H od covering the rudimentary tentacles. 
Fig. 9. Side view of the tentacle raised from the socket in which it lies. 
Fig. 10. Place of junction of tubes in the angle made by the oral lappets and the 
body of the Ctenophore (Mnemiopsis). 
e. Tube from the ambulacral combs. 
f. Row of pigment spots extending to the tentacle, and beari 
Leidyi) with embryonic tentacles extended. 
a little younger than those figured 
Fig. 
ng small 
thread-like tentacles. 
Vig. 11. Cells found forming a network on the inner surface of the oral lappets of 
Mnemiopsis. 
Fig. 14. Dactylometra quinquecirra, A. Ag. 
PLATE IX. 
Fig. 1. Young of Agalma elegans. 
Athorybia stage of A. elegans. 
