16 Catalogue of Chaetopoda 



greater detail. The Errantes, which are adapted for creeping or 

 swimming, have well developed soft appendages on almost all the 

 body segments. This order, the only one fully considered by the 

 authors, was defined in almost the same terms * as the Nereideae 

 (Savigny). The other three orders, named Tubicoles or Sedentaires 

 (with soft appendages aggregated at the anterior end), Terricoles and 

 Suceuses, corresponded nearly 2 to the Serpuleae, Lumbricinae and 

 Hirudines of Savigny. The authors established seven new genera and 

 more than a score of new species. The families of the order Errantes 

 only were given, namely, Aphrodisiens, Amphinomiens, Euniciens, 

 Nereidiens, Ariciens, Peripatiens, Chetopteriens, Arenicoliens. 



The orders Errantes and Tubicoles (Sedentaires) of this classifica- 

 tion were accepted with little modification by Quatrefages in his 

 " Histoire naturelle des Anneles " and by Claparede in his " Annelides 

 chetopodes du golfe de Naples," and consequently were adopted by 

 nearly all subsequent authors, especially in France and Great Britain, 

 until almost the close of the last century. 



The family Telethuses, founded by Savigny for the genus 

 Arenicola, was renamed Arenicoliens by Audouin and Milne Edwards, 

 and this designation, or some modification thereof, recalling that of 

 the genus, has been generally adopted. 



The numerous advances in the study and classification of 

 Annelids, made from 1795 until 1834, had been almost entirely clue 

 to the labours of the French School, that is, of Cuvier and his 

 disciples, who have left an enduring mark upon this branch of 

 zoology. The stimulus given by their work produced responses in 

 other countries, especially in Britain, Germany and Scandinavia. 



Johnston, who drew up a classification of Annelids in 1846, 3 

 interpreted the limits of the class in a wider sense than Cuvier, 

 Lamarck or Savigny. His classification is fundamentally that of 

 Savigny, with some modification of the limits of the subdivisions, 

 and with the addition of the Nemertina, a decidedly retrograde step. 



E. Leuckart 4 (1848) included the Nematodes in the "Annelides" 

 and placed the leeches with the Turbellaria, Trematodes and 

 Nemertines ; and Quatrefages 5 (1850) divided the worms into " Vers 



1 Note, however, that Arenicola was placed in this order, whereas Savigny 

 included it in the Serpuleae. 



2 As is shown by the families referred to these orders by Edwards in his 

 Elem. de Zool., ii (1834), p. 1016. 



3 Ann. Mag. Nat. Hist., xvi, p. 433. 



4 Morph. u. Verwandtsch. d. wirbell. Thiere (1848), p. 44. 

 ' Ann. Sci. Nat. Zool., ser. 3, xiii (1850), p. 7. 



