DESCRIPTIONS OF EARTHWORMS. 79 



sides (1 and 1). lu the segments behind the clitellum the 

 setae of each ventral couple become a little closer to each 

 other, whilst the median distance between the internal 

 ventral bristles is somewhat greater. The distance between 

 a ventral and dorsal couple measures about thrice the 

 distance between 1 aud 2 ; the setae of the dorsal couple 

 are placed somewhat closer to one another than those of 

 the ventral couple. In most of the segments of the clitellum 

 and in those in front of it dorsal bristles could not be re- 

 cognized ; in the four anterior segments the ventral setae 

 were also invisible. The setae are not very long, 0.80 mm.; 

 they have the ordinary shape , but are ornamented near 

 their distal ends with several rows of crescent-shaped ridges 

 (fig. 4, a). These ridges are much more marked in the cli- 

 tellar setae (fig. 4, b), which are very different in shape 

 and length from the ordinary setae ; they are twice and a 

 half as long as the latter (2 mm.) and only slightly curved, 

 want the usual thickened region in the middle , and have 

 their distal end of a lanceolate shape. It may be obser- 

 ved that in the other giant earthworm of Brazil, Geoscolex 

 maximus Leuck. ^) ( Titanus hrasiliensis Perr.) ~), the setae in 

 the posterior segments have also a tendency to separate. 

 However, my observations about Anteus gigas are not quite 

 in accordance with Perrier's description. According to this 

 author the setae are arranged like in the common earth- 

 worm , in four series of pairs , two of them situated quite 

 ventrally , the two others dorsally , the series are con- 

 stantly parallel to each other from the anterior to the 



1) Zoologische Bruchstücke , Heft II, 1841, p. 104, pi. V. 



2) loc. cit. p. 57 , pi. 1 , fig. 15 and 16. 



Rosa, sul Geoscolex maximus Leuck., BoUett. dei Musei di Zoologia di 

 Torino, N°. 40, 1888. Perrier afterwards described in his paper on Ponto- 

 drilus (Archiv. de Zoölogie expérim. Vol. IX, 1881, p. 217 and 235) an 

 other species: Tit. forguesii ; it appears however somewhat dubious to me if 

 this species really belongs to the same genus, because it differs from Tit. 

 hrasiliensis by having the setae in four series of pairs, by its male pores 

 opening on segment XVII and by the situation of the nephridiopores in front 

 of the dorsal setae. 



Notes from ttie Leyden ]Museuixi , Vol. X!II1. 



