268 SERTULARIID^. 



We shall feel no surprise at the quantity in which this 

 zoophyte occurs, when we remember that, besides the rapid 

 and prolific development of new shoots from the creeping 

 stolon, the planulse are produced in immense numbers. 

 At certain seasons the reproductive capsules cover the 

 pinnse in almost continuous rows, each of them containing, 

 according to Sir John Dalyell, a brood of six or seven 

 embryos. A finely grown specimen will bear some 500 

 pinnae, and if only a fourth of them should produce cap- 

 sules, and no more than six should occur on each of the 125, 

 we should have at the lowest computation 4500 planulse as 

 the offspring of a single shoot, and 90,000 of such a cluster 

 of shoots as I have described above. In the case of S. 

 aryentea the capsules are much more numerous, and we 

 may fairly reckon the produce of a shoot at 1 5,000 embryos. 



[Belgium (Van Ben.): La Charente inferieure, common 

 (Beltremieux) : North Cape, abundant, where there is a 

 strong stream (Sars): Greenland (Fabricius): Mingan 

 Islands, Gulf of St. Lawrence, and Labrador (A. S. Pac- 

 kard, jun.) : St. George's Bank, Newfoundland (Stimpsou) : 

 Mediterranean (teste Pallas).] 



6. S. AROENTEA, Ellis and Solander. 



"SQUIRREL'S TAIL," Ellis, Corall. 6, pi. ii.figs. c, C. 

 SERTULARIA CUPRBSSINA fi, Linn. Syst. 1308. 



,, CUPBESSINA (in part), Pallets, Elencb. 142 ; Esper, Pflanz. Sert. 



t. iii. figs. 1, 2. 



ARGENTEA, Ellis Sf Soland. Zooph. 38 ; Esper, Pflanz. Sert. t. xxvii. 



figs. 1, 2 ; Lamk. An. s. V. (2nd ed.) ii. 143 ; Lamx. Cor. flex. 

 192 ; Johnst. B. Z. 70, pi. xv. and pi. xiv. figs. 3, 3 ; Agassi;, 

 N. H. U. S. iv. 35G. 



FASTIGIATA, Fabricius, Faun. Groenlandica, 458, 



DYNAMENA ARGENTEA, Flem. Br. An. 544. 



Plate LVI. 



SHOOTS gregarious, bushy, somewhat blunt at the top; 



