REPORT ON THE DEEP-SEA MEDUSAE. 



153 



brella. The velarium (or pseudo-velum), which is found in some Acraspeda, is a similar 

 but essentially different structure. 



Velum-iihnliche Randmembran. 

 Insertions-Rand des Velum. 

 (Untere) Dorsalflache des Velum. 

 Suspensorien des Velarium. 

 Freier Axial-Rand des Velum. 

 (Obere) Ventral-Flache des Vellum. 



Innenschirm. 



Bauchiound, 



Inner (concave) Schirmwand, 



Schwimmsack. 



The inner or lower ventral wall of the gelatinous umbrella, covered by the ventral 

 ectodermal epithelium with an underlying circular muscular layer ; it is vaulted more or 

 less concavely, and corresponds to the peristomial plate of the polyps. 



wc Plicae circulares subumbrales. 



wf Frenula subumbralia. 



wi Tabulae intergenitales. 



wr Mesenteria (vel Mesogonia). 



ws Sulci circulares subumbrales. 



wv Valvula? subgenitales. 



Circular folds of the subumbrella. 

 Radial folds of the subumbrella. 

 Intergenital plates (Rhizostomffi). 



Ringfalten der Subumbrella. 

 Verticale Falten der Subumbrella. 

 Intergenital-Tafeln der Subumbrella 

 (Rhizostomen). 

 Circumoral buttresses (perradial) or Gekrosplatten oder Mesenterial- 

 mesenteric folds. Falten. 

 Circular furrows (between the folds Ringfurchen (zwischen den Ring- 



of the subumbrella). falten der Subumbrella). 



Subgenital valves (of the Rhizos- Subgenital-Klappen (der Rhizos- 

 tomae). tomen). 



x X. Organa varia ex- 



ODERMALIA. 



Various Organs of the 

 Ectoderm. 



Verschiedene Organe des 

 exoderms. 



y Y. Organa varia en- 



TODERMALIA. 



Various Organs of the 

 Endoderm. 



Verschiedene Organe des 



Entoderms. 



Z. FULTURA. 



Lamina fulcralis, 

 Lamina basalts. 



Supporting Plate. 



Clwndrophijs, 

 Fulcral plate. 



Stutzplatte. 



Stiitzlamelle, 

 Fulcral-Platte. 



A structureless hyaline membrane lying immediately under the epithelium of the 

 endoderm, and excreted by it (more rarely a local production of the ectoderm, as for 



(ZOOL. CHALL. EXP. — PART XII. — 1881.) M 20 



