Historical 1 1 



(1801). He removed Les Arrosoirs to the Mollusca, but was evidently 

 not certain (p. 98) that this was a correct procedure, and added the 

 new genera Arenicola and Spirorbis. His arrangement of the worms 

 is tabulated thus : 



l" r Ordre. Vers exterieurs (ou externes). 

 I. Corps muni d'organes exterieurs. 



A, Ceux qui ont des branchies externes . . . . , 



Nereis, Aphrodita, Amphinome, Arenicola, Terebella, Amphitrite, 

 Serpula, Spirorbis, Dentalium. 



B. Ceux qui sont depourvus de branchies externes, 



Furia, Nais, Lumbricus, Thalassema. 

 II. Corps depourvu d'organes exterieurs 

 Gordius, Hirudo, Planaria. 



2 me Ordre. Vers intestins 

 Fasciola, etc. 



Bosc, in his " Histoire Naturelle des Vers " (1802), arranged the 

 genera of worms with external organs (i.e. those in Section I. above) 

 in two subdivisions, according as they are nude or live in tubes. In 

 the former division he placed Aphrodita, Amphinome, Arenicola , 

 Nais, Lumbricus and Thalassema. This was the first time that the 

 presence of a tube had been brought into use as the character of a 

 subdivision. 



In 1802 Cuvier * stated that he thought it could be shown that 

 all Lombrics, Sangsues, Nayades, Nereides, Aphrodites, Arnphitrites 

 and Serpules have red blood, and, though he had not examined the 

 Amphinomes and the rest of the articulate non-intestinal worms, he 

 believed that they would also prove to possess red blood. 2 He gave 

 an account of the vascular system of Arenicola, and pointed out, in 

 conclusion, that the possession of red blood by the " Vers articules " 

 is a very striking character by which they can be distinguished from 

 the intestinal worms. 



To this class of segmented worms with red blood, Lamarck, in his 

 course of zoology in 1802, gave the name Annelides, 3 but it was not 

 until some years had passed that the name found general acceptance. 



Cuvier, in his " Regne Animal" (1817), divided the Annelides 



1 Bull. Sci. Soc. Philom., Paris, An x [1802] , No. 64. 



2 Others remarked that not all Annelids have red blood, e.g. Blainville 

 pointed out that in Aphrodite the blood is yellow. Nevertheless, the state- 

 ment of Cuvier may be taken as generally holding good. 



3 Disc, d'ouverture, 27 floreal, An x, Mus. d'Hist. Nat., Paris. " La 

 nouvelle classe des Annelides." See reprint of the discourse in Bull. Sci. 

 Franc. Belg. xl (1907), p. 56. 



