28 CLASS ANNELIDA. i 



dies, like two wings. The gills, in the form of laminee, are 

 attached, rather below than above, and predominate along 

 the middle of the body. 



There is one species, ChcBtopterus Pergamentaceus, eight 

 or ten inches long, which inhabits a tube of the substance of 

 parchment. It belongs to the sea of the Antilles. 



THIRD ORDER OF THE ANNELIDA. 



THE ABRANCHIA, 



Have no organ of respiration externally apparent, and seem 

 to respire, some like the lumbrici, by the entire surface of their 

 skin ; others, like the Hirudines, by interior cavities. They 

 have a closed circulating system, most generally filled with 

 red blood, and a knotted nervous cord, like all the Annelida. 

 There are some which still have seta), or bristles serving for 

 locomotion, and others which are destitute of them, which 

 gives rise to the establishment of two families. 



The first family, that of 



Settgerous Abranchia, or provided with Set^, 

 comprehends the Lumbrici and the Naides of Linnaeus. 



LuMBRiccJS, L., — vulgo, earth-worms — characterized by a 

 long cylindrical body, divided by wrinkles into a great num- 

 ber of rings, and by a mouth without teeth^ necessarily re- 

 quired subdivision. 



LuMBRlcus, Guv. (proper), 



Are destitute of eyes, of tentacula, of gills, and of cirrhi; a 

 tubercle, or sensible enlargement, particularly at the season of 

 reproduction, seems to attach them to each other in inter- 

 course. In their interior there is a strait rugose intestine, 



