36 Edward T. Browne. [No. 4 



Plate V. 



Fig. 1. Aequorea norvegica, nov. sp. Lateral view of a ten- 



tacle. x 10. 



„ 2. — „ — Outer view of a tentacle. x 10. 



„ 3. — „ — Inner view of a tentacle. x 10. 



„ 4. — „ — Oral lips, inner side. x 2 1 / 2 . 



„ 5. — „ — ■ Portion of the sub-umbrella. Slightly 



larger than natural size; semi- 

 digrammatic. Oral lips (L). Stomach 

 (St.). Radial canals (Rad. C.) Gonad 

 (Gon.) Velum (V.) Tentacles (T.). 



„ 6. Piychogastria polaris. Portion of the margin of the um- 



brella showing the arrangement of 

 the tentacles. 



.„ 7. — „ — Tentacle with a terminal sneker. 



8. — ,.— Tentacle without a terminal sucker. 



List of Reference Letters for flgures of Ptychogastria polaris, 



A. Sense-organ. 



BC. Centripetal canal. 



CC. Bing canal. 



EL. Endodermal lamella. 



-EN. Endoderm. 



EX. Ex-umbrella. 



G. Gonad. 



L. Oral lip. 



M. Muscle Band. 



JMS. Mesentery. 



N. Nematocysts. 



BC. Badial canal. 



SL. Lobe of the Stomach. 



SB. Bidge, with folded edge, inside the stomach. 



SU. Tentacle with terminal Sucker. 



SU. 1 Boot of a broken off Tentacle having a terminal Sucker. 



T. Eiliform Tentacle. 



T. 1 Boot of a filiform Tentacle belonging to the isolated series. 



T. 2 Boot of a filiform Tentacle belonging to the group series. 



(T. 1 and T. 2 represent the "Sucking-cups" of Haeckel). 



"V. Velum. 



