253 



CCELENTEEATA. 



Fam. Lucernaridae. Lucernaria 0. Fr. Mliller, Calycozoa with four radial 

 chambers ; without genital pouches, and without the accessory chambers of 

 the di<r^>stive cavity alternating with these. L. /jutulricor/tiit 0. Fr. M tiller, 

 camj>anulata Lmx. Craterolophus Clark, with genital pouches and four 



chambers of the gastric cavity alterna- 

 ting with them. Or. LrurJutrti Tschb. 

 = lielgolandica Lkt., Heligoland. 



The Lucernaria are without exception 

 marine animals, and are remarkable for 

 their great reproductive power. Accord- 

 ing to A. Meyer, if the stalk be cut off, 

 the cup reproduces a new one, and 

 injured individuals, and even excised 

 pieces, can become perfect animals. 



(2) Sub-order : Marsupialida 



Tetra-radiate Acalepha having a 

 four-sided pouch-like form. The 

 velum has a smooth margin, and 

 contains vessels prolongations of 

 the gastro-vascidar system]. On the 

 margin of the disc there are four 

 vertically placed lobe-like appen- 

 dages. There are four covered sense 

 organs, and the same number of 

 vascular pouches separated by nar- 

 row partition walls. 



The Charybdece are distinguished 

 by the deep bell shape of their body, 

 and were formerly reckoned as 

 " Craspedota " among the Hydro- 

 medusce, with which they certainly 

 have some characteristics in com- 

 mon. Amongst these character- 

 istics the most striking is the 

 possession of a smooth-edged velum. 

 which, however, contains vessels. 

 Q n the other hand, the presence of 

 the gastric filaments and ot the 

 large sense organs enclosed in 

 niches points to a relationship with the Acalepha ; and this view is 

 supported by the character of their whole structure, in which the 

 peculiarities of the Lucernaridce are perceptible, though greatly 



FIG. 198. CJiai-i/bdea miirnipiaiis, natural 



size. T, Tentacles; RTc, marginal bodies 



(sense organs) ; Oo, ovaries. 



