METAZOA COELENTERA. 4 131 



The body of Phymactis florida Drayton (No. 209), is 

 much shorter than that of Metridium ; its mouth is ele- 

 vated above the oral disc and surrounded by short tenta- 

 cles. 



Phyllactis punctata Couthouy (No. 210), is a large 

 Actinian in which the inner tentacles are similar to those 

 of our common sea anemone, while the outer ones are like 

 fluted lobes edged with green. These lobes sometimes 

 adhere together nearly their whole length. This Actinian 

 is found buried up to its disc in sand. According to Dana 

 this creature crawled on glass by means of its outer lobed 

 tentacles. 



Biddium parasiticum Ag. (PI. 211, figs, i, 2, natural 

 size), is interesting since, unlike most Actiniae, it pos- 

 sesses an anus at the posterior end of its body. It is 

 found in the mouth-folds of the medusa, Cyanea arctica 

 Per. & Less. The body is long and ribbed from one end 

 to the other. Besides the longitudinal markings there are 

 many transverse wrinkles. Fig. i shows the body con- 

 tracted and the anus open. The terminal opening in five 

 tentacles is seen, two are closed, and one is turned from 

 the observer. In fig. 2 the body is expanded and the 

 anus closed ; the twelve tentacles are visible. Fig. 3 is 

 an enlarged drawing of the posterior portion of the body, 

 showing the terminal anus and the rows of minute openings 

 which radiate from it. 



ANTHOZOA. 



MADREPORARIA. 



The Madreporaria may be grouped into the Aporosa or 

 Imperforata, the Fungidae, and the Perforata. It must 

 be borne in mind, however, that there are no sharp divi- 

 sion lines between these groups. The time will doubtless 

 come when the ancient imperforate Madreporaria will be 

 distributed as ancestral forms among the different families 



