MANUAL OF NATURAL HISTORY. 313 



cupping apparatus of nature considered by the 

 members of the medical profession, that upwards of 

 seven millions are imported into Britain every year 

 by four only of the principal dealers. The Bran- 

 chellion is a peculiar kind of Leech, which is para- 

 sitic on the Electric-Torpedo ; and another kind has 

 been found attached to the Turtle of the Pacific. 

 The Planaria appears to be the molluscan repre- 

 sentative among the Annelids ; and the remarkable 

 genus Herpa, described|by Guilding, resembles a Pla- 

 naria which respires free air, being found on decayed 

 fronds of Palms on the summits of high mountains. 

 The Gordius and other kindred forms appear to re- 

 present the Helminthoid Orders of the Radiate type 

 of animals. 



VII. CLASS. ANNELIDS (Annelida). 



Body soft, vermiform, divided into segments or 

 transverse rings more or less distinct ; blood colour- 

 ed (usually red) ; respiration performed by external 

 or internal gills, or by the skin ; organs of locomo- 

 tion variable, not jointed. 



I. SUB-CLASS. POLYPOD-ANNELIDS (Polypoda). 



Body provided with distinct feet-like appendages 

 with setae at their ends, and with various dermoid 

 appendages. Marine. 



I. ORDER. FREE-ANNELIDS (Errantia). 

 Body extending beyond the oral aperture, and 



