218 



ANNELIDA. 



minuter details 

 connected with 

 the arrangement 

 of the vessels our 

 information is but 

 vague and unsa- 

 tisfactory. The 

 investigation, in- 

 deed, is attended 

 with considerable 

 difficulty. The 

 annexed figure of 

 an elaborate 'dis- 

 section of an Am- 

 phinome (-4. ca- 

 pillata)) copied 

 from one of the 

 beautiful draw- 

 ings contained in 

 the Hunterian 

 Collection,* af- 

 fords an example 

 of a circulating 

 system in which 

 the propulsion of 

 the blood is ef- 

 fected entirely by 

 vessels, without 

 the intervention 

 of any muscular 

 cavities or heart. 

 In this animal 

 the respiratory 

 organs are penni- 

 form appendages 



* Descriptive and 

 illustrated Catalogue 

 of the Physiol. Series 

 of Comp. Anat. in the 

 Mus. Royal Coll. Sur- 

 geons, London, vol. ii. 

 pi. xiv. 



Fig. 93. 



