APPENDIX. 385 



(4), with short, finger-shaped branches (vol. ii. p. 139). Behind it, 

 below on the left (5), is a very large marine rose (Actinia), a single 

 individual from the class of six-rayed corals (Hexacoralla, vol. ii. 

 p. 143). Its low, cylindi'ical body has a crown of very numerous 

 and large leaf-shaped tentacles. Below, in the centre of the 

 ground (6), is a sea-anemone (Cereanthus) from the group of four- 

 fold corals (Tetracoralla). Lastly, on a small hill on the bottom 

 of the sea, there rises, on the right above the corals (1) a 

 cup-polyp (Lucernaria), as the representative of the stalked- 

 jellies. (Podactinaria, or Calycozoa, vol. ii. p. 144.) Its cup- 

 shaped, stalked body (7) has eight globular clusters of small, 

 knotted tentacles on its rim. 



Among the sivlmmi'Ug Zoo]}hytes which occupy the upper half 

 of Plate VII., the hydromedusse are especially remarkable, on 

 account of their alteration of generation. (Compare vol. i. p. 206) . 

 Directly above the Lucernaria (7) floats a small tiara jelly 

 (Oceania), whose bell-shaped body has a process like a dome, 

 the form of a papal tiara (8). From the opening of the beU 

 there hangs a wreath of very fine and long tentacles. This 

 Oceania is the offspring of a tube-polyp, resembling the adhering 

 Tubularia below on the left (3). Beside this latter, on the left, 

 swims a large but very delicate hair- jelly (^quorea). Its disc- 

 shaped, slightly arched body is just drawing itself together, and 

 pressing water out of the cavity of the cup lying below (9). 

 The numerous, long, and fine hair-like tentacles which hang down 

 from the rim of the cup are drawn by the ejected water into a 

 conical bunch, which towards the centre turns upwards like a 

 ' collar, and is thrown into folds. Above, in the middle of the 

 cavity of the cup, hangs the stomach, the mouth of which is 

 surrounded by four lobes. This -^quorea is derived from a 

 small bell-polyp, resembling the Campanularia (2). The small, 

 slightly arched cap-jelly (Eucope), swimming above in the centre 

 (10), is likewise derived from a similar bell-polyp. In these three 

 last cases (8, 9, 10), as in the majority of the hydromedusK, the 

 alternation of generation consists in the freely swimming medusa 

 (8, 9, 10), arising by the formation of buds (therefore by non- 



VOL. II. 2 C 



