REPORT ON THE DEEP-SEA MEDUSA. 53 



to the four longer septa or iuterradial selvages, which separate the four broad radial 

 pouches in the Lucernarida? (comp. Pis. XVI., XVII.). 



The four reproductive glands (figs. 2, 3, 4, 6, o) in Tesseraniha, as in Tessera and 

 Depast rum ( = Carduella) form four horseshoe-shaped swellings in the subumbral wall of 

 the coronal sinus. Their central arch encloses the four septal nodes with its concave 

 distal margin, whilst its concave proximal margin projects above into the central gastral 

 cavity, and appears fimbriated with the lowest distal group of the gastral filaments. The 

 two limbs of the U-shaped reproductive arches run upwards, diverging slightly into the 

 subumbral wall of the coronal intestine, and their limbs, which are curved outwards, 

 touch the proximal margin of the coronal muscle. In Tesserantha, as in Tessera, a 

 thickened gelatinous selvage of the fulcral plate of the subumbrella appears to project 

 into the hollow space of the coronal sinus, in the entire extent of the reproductive swell- 

 ing, and the sexual cells appear to be developed from the endodermal epithelium of the 

 sinus on the axial side of these genital selvages. The spirit specimen (a female) which I 

 examined did not admit a closer investigation of its finer structure. Slight transverse 

 folds are visible on the endodermal upper surface of the genitalia (figs. 3, 4, s). 



Family, Luceekarid.i;, Johnston, 1847. 

 LucERXARiDiE, Hajckel, System der Medusen, 1879, p. 379, taf. xxii. 



Stauromedusse, wdth lobed or incised umbrella margin, divided by eight concave 

 arches (four perradial and four iuterradial) into eight hollow- adradial lobes or arms ; a 

 brush-shaped bunch of hollow knobed tentacles at the end of each arm ; eight principal 

 tentacles (four perradial and four interradial) either transformed into adhesive marginal 

 anchors or wanting (having undergone retrograde metamorphosis, or lapsed). Coronal 

 muscle of the umbrella margin divided into eight isolated marginal muscles. A peduncle 

 for adhesion at the apex of the umbrella. 



Sub-family, Haliclystid^;, Hgeckel (EleutherocaepiD/E, Clark). 



Lucernaridse without mesogonial pouches in the subumbral wall of the four radial 

 pouches. 



Lucernaria, 1 0. F. Mtiller, 1776. 



Lucernaricke without mesogonial pouches in the subumbral wall of the four radial 

 pouches, and without marginal anchors or marginal papillae (Lucemaridce eleuthero- 

 carpce inauriculata). Peduncle one chambered with four separate tamiola. 



' Lucernaria, like a candle ; from Lucerna, a candle. 



