LEPEALIA. 303 



cies and another, and owing also to the different aspects 

 which, from age and various other circumstances, the same 

 species present. When Professor Fleming's ' British Ani- 

 mals' was published, in 1828, only five species were de- 

 scribed. By the time Dr. Johnston's first edition of his 

 work on British Zoophytes appeared, more than double 

 this number were described and illustrated ; and when the 

 second edition of his ' History' was published, it contained 

 the description of thirty-seven species; and the author 

 states that, extensive as the list was, he had specimens 

 which he could not confidently refer to any of the species 

 described. We know that several distinguished Naturalists 

 are at present at work with these little beauties, exercising 

 upon them all their powers of discrimination ; and we are 

 glad to learn that some of them intend to favour the public 

 with the result of their investigations. We should be afraid 

 to attempt describing the whole of these pretty little puz- 

 zlers; and though we had the boldness, the limits of our 

 work would compel us to rest satisfied, in many cases, with 

 doing little more than inserting the name. 

 * Wall of the cells smooth. 



1. LEPRALIA HYALINA. 



Hab. Parasitical on shells, stones, and algse. Shores of 



