76 



VESICLES OF CORALLINES. 



are scattered irregularly on the 

 branches, stalked, ovate, or pear- 

 shaped, with a short tubulous 

 aperture, and occasionally wrin- 

 kled longitudinally, when dry. In 

 the Sertularia pluma, they are 

 large and remarkably curious : 

 they are produced from the 

 main stalk, and resemble a swol- 



SERTULARIA TAMARJSCA. i i i i i -^i / 



len pod, girded round with from 

 five to nine ribs or bands, pro* 

 ceeding from a dorsal tube, and 

 rising into short spines on the 

 anterior margin; when recent, 

 they are translucent. The ves- 

 icles of the Dynamena oper- 

 culata are large, smooth, .egg- 

 shaped, the top often covered 



SERTULARIA POLYZOMA. 



VESICLES or THE 



ANTENULARIA. 



RAMOSA. 



the Tubular ia indivisa clusters 

 of oviform gemmules appear at 

 certain seasons. The vesicles 

 of the Antenularia ramosa, on 

 the contrary, are attached to the 

 central stem, and not to the 

 branches. 



The vesicles, of which only a 

 few specimens have now been 

 given, are the seed vessels of the 



P , TT ,-t n 



future race. Here the germs float 



