CAMPANUL ARIADNE I CAMPAMJLARIA. 



115 



Their close resemblance with Campanularia dumosa is shewn by a 

 comparison of the annexed figures : Fig. 21 representing the Cam- 

 panularia, and Fig. 22 the Weymouth presumed Cornularia, both 



Fig. 21. 



of them drawn from specimens which grew on Tubularia indivisa. 

 They obviously differ in nothing but size, a difference which may 

 be the effect of some peculiarity in the habitat, and not greater than 

 what we observe in some shells of the south when compared with 

 those of the north of England. Until, therefore, the animal of the 

 larger specimens has been examined, which Mr. Gray has had no 

 opportunity of doing, it would, in my opinion, be premature to in- 

 troduce the Cornularia into our catalogue. The more readily to 

 enable the student to determine this point, I give a copy of Cavo- 

 lini's figure of the species. At a of Fig. 23, on the next page, it is 

 represented of its natural size ; and b is a magnified figure of a single 

 individual. 



