464 ANNELIDES. 



self-impregnation. According to the observations of M. Motitegrc, 

 the ova descend between the intestine and the external envelope to 

 the circumference of the rectum, where they are hatched. The 

 young ones issue, living, from the anus. M. Leon Dufour, on the 

 contrary, affirms that their ova resemble those of the Leech. The 

 nervous cord is nothing more than a crowded suite of numerous 

 little ganglia(l). 



M. Savigny subdivides them again. 



His Enteriones have four pairs of small setae, eight in all, under 

 each ring. 



Everyone knows the Common Earth-ivorm Lumhricus terres- 

 iris, L. with a reddish body, that attains nearly a foot in length, 

 and which is composed of upwards of one hundred and twenty 

 rings. The tubercle is near the anterior third. Under the six- 

 teenth ring are two pores, the use of which is unknown. 



This animal traverses the soil in every direction, and swal- 

 lows a quantity of earth. It also eats roots, ligneous fibres, 

 animal fragments, See. In the month of June it rises to the 

 surface during the night, to seek for a companion in the pro- 

 cess of copulation(2). 

 His Hypog^ones have, besides, an azygous seta on the back of 

 each ring. 



The only species known is from America(3). 

 Messrs Audouin and M. Edwards also distinguish the Teophoni^, 

 which have four bundles of short seise on each ring, and on the an- 

 terior extremity a great number of long and brilliant setae which 

 surround the mouth(4). 



(1) Conf. Monteg-re, Mem. du Mas., I, p. 242, pi. xii, and Leon Dufour, Ann, 

 des Sc. Nat. V, p. 17, and XIV, p. 216, and pi. xii, B, f. 1 4- 



See also the treatise of Morren, De Lumbrici Terrestris Historia Naturali nee 

 non Anatomica, Bruss., 1829, 4to. 



(2) What is here stated is common to many species, first ascertained by M. Sa- 

 vig-ny. He has distinguished twenty of them. See my Analyse des Travaux de 

 I'Acad. des Sc, 1821. M. Duges distinguishes six, but does not refer tliem ex- 

 actly to those of M. Savigny. 



N.B. Muller and Fabricius speak of Lumbi-ici with two setx to each ring, of 

 which Savig-ny proposes to make his genus Clitellio, {Lumhricus minutus, Fab., 

 Faun., Groenl., f. 4), and of others with four and six setse; but their descriptions 

 requirfe to be confirmed and completed ere their species can be classed. 



(3) Hypogxon hirtum, Sav., Eg., Annel., p. 104. 



(4) Trophonia barhata, Aud.,and Edw., Littor., de la France, Annel., pi. x, f- 

 1315. 



