476 



SUPPLEMENT. 

 Fig. 86. 



M. Sars reduces the Lucernaria quadricornis of Muller, and the 

 L. fascicularis of Fleming to one species, a conclusion at which Mr. 

 Alder had almost arrived. See p. 252. 



Sars doubts whether I am right in making the Luc. convolvulus, 

 Johns, synonymous with the Luc. campanulata, Lamour. ; and he 

 complains of the imperfection of my description of the species. This 

 I regret that I cannot amend nor render more complete. The 

 species is liable to considerable variation. May there not be awant- 

 ing in M. Sars the faculty of apprehending the written characters of 

 a species 1 Some good naturalists are defective in this faculty, 

 and hence their constant reference to figures, and their inordinate 

 estimation of their value. 



POLYZOA INFUNDIBULATA. 



EUCRATIAD.E. 

 HIPPOTHOA (p. 291) CASSITERIDES, Couch. (Fig. 87.) 



" H. encrusting, calcareous ; cells ovoid, connected to each 

 other by a short stout thread ; openings nearly round, with 

 thickened rims ; a short distance from the proximal lip is a 

 small pearly tubercle." 1 " 1 R. Q. Couch. 



Hob. " On a stone between the Scilly Islands and the Lands-End. 

 This species I found on a bit of stone dredged up off the Lands-End. 

 The number of perfect cells is six, with a few others partially de- 

 veloped. Their general appearance is that of H. lanceolata, but 

 under a lens, other characters appear which indicate a distinct 

 species. The cells are stouter and more pear-shaped, and the threads 

 of connection shorter and stouter, being about one-third the length, 



