LUCERNARIAD/E : LUCERNARIA. 251 



more certainly the tentacula are widely displayed ; but no sooner 

 have they felt the prey than they instantly contract, envelope it in 

 their joint embrace, and carry it to the mouth by an involution of 

 the whole marginal circumference. I have found that the glands 

 with which the tentacula are tipped perform the office of suckers, 

 as Lamarck conjectured, and thus retain their captives with greater 

 certainty : but if Dr. Fleming's figure of L. fascicularis is correct, its 

 tentacula are not glanduliferous. 



" Their mode of progression differs under different circumstances. 

 If intending to move to any great distance, they do so by loosening 

 their attachments, and then, by various and active contortions, they 

 waft themselves away till they meet with any obstruction where 

 they rest ; and if the situation suits them, they fix themselves, if 

 not, they move on in the same manner to some other spot. If the 

 change be only for a short distance, as from one part of the leaf to 

 another, they bend their campanulate rims, and bring the tenta- 

 cula in contact with the Fucus, and by them adhere to it. The 

 footstalk is then loosened, and thrown forward, and twirled about, 

 till it meets with a place to suit it ; it is then fixed and the tenta- 

 cula are loosened, and in this way they move from one spot to 

 another. Sometimes they move like the Actiniae, by a gliding mo- 

 tion of the stalk. 



" In taking their prey they remain fixed with their tentacula 

 expanded, and if any minute substance comes in contact with any 

 of the tufts, that tuft contracts, and is turned to the mouth, while 

 the others remain expanded watching for prey." R. Q. Couch. 



recommenfoit de suite, et les mouvemens etoient vifs et prompts. L'animalcule fut 

 enfin saisi par les tentacules d'un des rayons, qui a Tinstant se replie vers la bouche ; 

 les autres resterent toujours etales : ce rayon reprit peu a peu sa position ordinaire. 

 M'etant procure d'autres animalcules, je les donnai a mes Lucernaires, et j'eus le 

 piaisir de voir leurs mouvemens se repeter avec les memes circonstances." Mem. du 

 Mus. ii. 464. 



NOTES. 



1. POCILLOPORA INTERSTINCTA, p. 194. Of this coral the Rev. Dr. Fleming 

 exhibited " a characteristic drawing, by the late Mrs. Hibbert," to the Royal Society 

 of Edinburgh, on the 2nd March, 1846. The drawing was made from a Zetland 

 specimen. Edin. New Phil. Journ., July, 1846, p. 203. 



2. OCUHNA PROLIFERA, p. 195. Additional evidence of this being a British 

 coral has been procured. At a meeting of the Royal Society of Edinburgh, the 2nd 

 March, 1846, the Rev. Dr. Fleming "exhibited a specimen, six pounds in weight, of 



