46 SUPPLEMENT ^. 



me to be more precise, than that which has hitherto been 

 employed to distinguish insects from worms." 



Gmelin, in his edition of the Systema Natur(je, necessarily- 

 much augmented the number of genera, by collecting all that 

 had been established since the last edition of Linnaeus ; but he 

 made no great changes in the methodical distribution of 

 worms, except by adding the last class proposed by Muller, 

 under the name of infusoria. The chetopoda, and indeed 

 all the red-blooded worms were still scattered through the 

 three orders of intestina, mollusca, and testacea. He did not 

 profit by the observations of Pallas, of Muller, or of Blumen- 

 bach. 



In 1789, the part of the French Encyclopoedia, on worms, 

 by Bruguieres, made its appearance, with a table of the metho- 

 dical distribution of those animals. But this writer, though 

 he felt the necessity of establishing a new order, that of 

 echinodermata (now in the zoophytes), effected no sensible 

 amelioration. Nevertheless, in proportion as the study of 

 the animals of the inferior class proceeded, the name of 

 vermes, given to his last class by Linnaeus, was reserved for 

 the animals which the ancients thus distinguished, and ceased 

 to be generally employed for the other orders, which were 

 named mollusca, testacea, zoophytes, and infusoria. Thus, 

 in the Synopsis of Animals, published by Baron Cuvier, in 

 1798, the seventh book treats of insects and worms. Under 

 the name of worms, he then divided these animals into two 

 sections, according as they were provided, or unprovided, 

 with setae or spines for locomotion ; or, in other words, into 

 chetopoda and apoda, as has been done by M. de Blain- 

 ville. Among the first were grouped the species which live 

 in tubes, and also the lumbrici ; in the second were placed the 

 leeches, and intestinal worms. Thus the observation of Pallas 

 was appreciated, and put into execution, by Cuvier, respect- 



