J 14 



ANTHOZOA HYDROIDA. 



Fig. 20. 



ber of its order, being composed of a homogeneous somewbat granu- 

 lar jelly, very irritable and contractile, variable in shape, and in 

 which no trace of vessels of any kind is to be discovered. Each 

 polype is, moreover, connected behind with the central medulla of 

 the common stalk, which is of the same colour and structure as the 

 body of the polype itself (Fig. 20.) 



I have made the above description in order to correct an error of 

 the first edition of this work. I have there said that the form of 

 the cells, as well as the habit, of Camp, dumosa rendered its place 

 in the genus doubtful ; and I believed I had subsequently found 

 reason to identify it with the Cornularia rugosa of Cavolini. The 

 details now given shew that this conjecture was hasty and erroneous. 

 The species, though not a well-marked Campanularia, is neverthe- 

 less too nearly allied to admit of its removal ; and has, at all events, 

 no affinity with Cornularia, which appears to be an aberrant genus 

 of Asteroid polypes. 



Is then the Cornularia rugosa, it may be asked, a native of our 

 seas 1 Mr. J. E. Gray has referred to it a zoophyte, specimens of 

 which he received from Miss Attersoll, who found them on the shore 

 at Weymouth, parasitical on Tubularia indivisa (Annals of Nat. 

 History, vol. i. p. 238). I have been favoured with some specimens 

 of this from my friend Mr. Gray, whose sagacity as a naturalist, as 

 well as his uncommon knowledge of species, I appreciate very highly. 



