HELMINTHOLOGY HELMINTHES CYSTICI. 489 



as a distinct new species of Cyst-worm, Cysticercus pedun- 

 culatus ; in which certainly no one will follow him. 



[The full account of Mr. E. Wilson's researches respecting 

 the Echinococcus appears in the Transactions of the Royal 

 Med. and Chirurg. Society of London, Nov. 12, 1844 (vol. 

 xxviii, p. 21, pi. 1), " On the Classification, Structure, and 

 Development of the Echinococcus hominis, showing reasons 

 for regarding it as a species of Cysticercus." He regards 

 the transparent oviform bodies as " apparently adipose cells," 

 and seems to consider them as peculiar to individuals that 

 had heen some time dead ; both which suppositions are 

 undoubtedly erroneous, as is also the statement that these 

 bodies are scattered irregularly through the substance of the 

 animal, for they are always situated immediately under the 

 integument, or between it and the internal granular substance 

 of which the interior of the body is chiefly composed. His 

 account of the mode of development of the animalcules is 

 highly interesting, if confirmed by further observation. The 

 comparison of the animalcule with the genus Cysticercus 

 (Zeder) was made by Pallas as far back as 1766, and in 

 1800 Zeder makes it a species of Cysticercus. Laennec in 

 1804 describes the granulations which he observed adherent 

 on the walls of the cyst as composed of several individual 

 vermiculi, which, he says, nearly resemble the Cysticercus. 

 Under the modern arrangement, however, of these genera, 

 as defined by Rudolphi, the Echinococcus must constitute a 

 distinct genus.] [On the same subject is also a paper by 

 the Translator in the Transactions of the Microscopical Society 

 of London, November 13, 1844 (vol. ii, P. i, p. 10, pi. 1), 

 " Some Observations on the Natural History of the Echi- 

 nococcus" in which is given a short summary of the history 

 of this animalcule, and an attempt is made to show the 

 unity of the species in man and other animals, and especially 

 to indicate the mode of attachment of the Echinococci among 

 themselves, and of the aggregate masses or so-called granu- 

 lations to the interior of the parent-cyst, together with other 

 particulars relating to the intimate structure of these 

 creatures.] 



