92 Parasites and their Uelations to other Animals. 



had no less than 23 individuals of Euterobrus, averaging a 

 line in length, besides a quantity of the other two genera, 

 growing upon it, and yet moved about in so lively a manner 

 that it did not appear the least incommoded by its load of 

 vegetation. 



The important point in these observations is, that they 

 shew that cryptogamic vegetables may exist in the internal 

 organs, and upon entozoa inhabiting these organs, without 

 disturbing the health, and even as an ordinary and normal 

 condition. This does not rebut the idea that other crypto- 

 gamia may produce diseases. They are known to exist in 

 apthge, in many diseases of the skin, have been found in the 

 secretions of cholera, and several acute diseases, and were 

 lately observed by Dr Leidy in a case of softening of the 

 stomach. Whether in these instances they are the cause or 

 effects of the morbid state, or even a mere coincidence, is not 

 decided. Dr Leidy regards the microscopic forms known as 

 vibrio as vegetable. In this opinion he is supported by other 

 observers. After mentioning the discovery of several species, 

 and a new genus of entozoa, he notices the existence of Gre- 

 garina in the ventriculus of Julus marginatus, Gregarina has 

 recently attracted much attention, as being supposed to be 

 an animal consisting only of two cells, and said by Siebold 

 to be destitute of an alimentary canal. Dr Leidy describes 

 a papilla surmounting the superior cell, with traces of an 

 external communication with the cavities of the cells. He 

 regards it as the larva of the entozoon. — Proceedings of 

 Academy of Natural Sciences^ Philadelphia. 



On the Estuary Beds and the Oxford Clay at Loch Stajin, 

 in Skye. Bv Professor Edward Forbes, F.R.S., 

 V.P.G.S., &c.* 



The purpose of the following brief notice is to put on re- 

 cord some observations made in the island of Skye in August 

 1850, by which the true geological horizon of the so-called 



• From a copy of the Memoir communicated by the Author. 



