MUSEUM OF COMPARATIVE ZOOLOGY. 179 



Fig. 12. Sextant of adult Z. grocnlandica (oral view.) 



c. One of four meridional lines of la.sso-cells ( ?) on the bell. 



d. Tubercles arranged in rows between the radial tubes, and situated 



on the under side of the bell. 

 V. Velum. 



PLATE VL 

 Timaformosa (young). 

 Mabella gracilis. 

 M. gracilis (side view). 



Otocyst of T. formosa (from young figured in Fig. 1). 

 Figs. 5, 6. These two figures show how by fission two otocysts of T. fomiosa are 

 formed from one. 



h. Point of constriction of walls. 

 Fig. 7. Liriope scutigera (adult female). 

 Fig. 8. Eudoxia Lessonii (side view). 



a. Primitive covering scale. 



b. Oil globule. This oil bubble is not the same as the float of Agalma. 



c. Somatocyst. 



d. Tentacle. 



e. Nectocalyx. 



/. Tentacular knob. 



g. Chyraiferous tubes of the nectocalyx. 



i. Oil globule in somatocyst. 



p. Polypite. 



s. Female sexual bells. 

 The lettering in Figs. 8, 9, and 12 corresponds. 

 Fig. 9. Eudoxia Lessonii (dorsal view). 

 Fig. 10. Mouth of Liriope scutigera. 

 Fig. 11. Otocysi o{ L. scutigera. 

 Fig. 12. Diplophysa inermis. 



PLATE VII. 



Fig. 1. Young of Cyanea arctica, showing the filaments covering the upper surface 



of the bell. 

 Fig. 2. Aurclia flavidula. 

 Fig. 3. Marginal sense organ of A. flavidula. View from the dorsal surface. 



a. Sense lappets. 



b. Sinnespolster. 



Fig. 3*. Same as above from oral surface. 



Fig. 4. Ephyra of C. arctica. Margin of the disk contracted. 



Fig. 4*. The same with disk margin expanded. 



Fig. 5. Marginal sense body of C. arctica (young). 



Fig. 6. Margin of the bell of A urelia flavidula with lobules and tentacles. 



Fig. 7. Portion of the disk of a young Cyanea in which the sense organ and bundle 

 of tentacles arc shown (oral vii-w). 



