Historical 5 



with nuinv feel — tlie "rdypoda" — were divided into " Teirestria " 

 and " A<[natica " ; the section " Terrestiia " comprised Jidus and 

 Scolopeuflra , while the " Aqnatica " inchided " Lngs " and l^colopcndra 

 marina. This chissification of the anietaholous " Insects '" followed, 

 in part, that of Aldiovandus ; the extensions were due to Eay's friend 

 Francis Willughhy. Bonnet* instituted an extensive series of 

 experiments and observations on Naids, with special reference to the 

 regeneration following removal of the anterior and posterior ends. 

 A preliminary account of these researches was given in letters to 

 Sir Hans Sloane,- in which also remarks were made on similar 

 studies on regeneration in earthworms. 



The first edition of Linnaeus' " Systema Naturae" (1735) marks 

 no advance on previous knowledge as regards worms ; the only 

 marine worm mentioned therein is Scol(ypcndra marina, which is 

 placed in the class Insecta. Among the " Vermes Eeptilia " (the 

 class being divided into Iteptilia, Testacea and Zoophyta) are GorcUiis, 

 Taenia, Zumhricus (including Intcstinum tcrrae, L. latus, Ascaris), 

 Hirudo and Limax. In the sixth edition of the " Systema " (1748) 

 the genera of " Vermes lleptilia " are Gordlus, Ascaris, Lumhricus, 

 Taenia, Fasciola, Hiriido, and, included among the "Vermes 

 Zoophyta," are the genera Amphitrite, Nereis ^ and Aphrodita. 

 Amphitrite is not mentioned in the tenth or twelfth editions ; the 

 reappearance of this name in the thirteenth (Gmelin's) edition is due 

 to the fact that Miiller had, in the interval between the twelfth and 

 thirteenth editions, founded a genus of worms with this designation. 



In the tenth edition of the Systema (1758), which is now regarded 

 as the foundation of zoological nomenclature, Linnaeus included the 

 genera Lumhricus (including the species terrestris and marinus), 

 Hirudo, Aphrodita, Nereis and Serpula, the species of which together 

 number more than forty; in the twelfth edition (1767) T'erthella 

 and Sabella (and Sipuneulus) were added to the list. The names 

 Lumhricus and Hiriido had been in use since the time of Pliny, 

 though the former, as defined in the tenth edition, has a much 

 less extensive significance than it bore in pre-Linnaean writings 

 (see p. 2); the other generic names appear to have been used for 

 the first time by Linnaeus. 



In the tenth and twelfth editions of the "Systema," Linnaeus 

 divided animals into six classes — Mammalia, Aves, Amphibia, Pisces, 



' Traite d'Insectologie, 2 Partie, Paris (1745). 



* Phil. Trans. R. Soc. Lond., xlii (1743), pp. 468-487. 



' Under which ScolopeiuJra marina is given as a sjTionyiu. 



