278 Dr. D. Rosa on some 



organization of Anteus I have urged that, in spite of several 

 statements to the contrary which have been made, we must 

 assume that in Anteus the first pair of nephridiopores are 

 always to be sought for on the third segment, and that, there- 

 fore, in front of the first pair of nephridiopores we must admit 

 the presence of two segments, which in many cases may be 

 hardly recognizable, as they are short and capable of being 

 introverted, so that the secretion of the first nephrida may 

 flow into the buccal cavity. 



I have shown that if we admit this point we find that, 

 with regard to the internal organs, the species of this genus 

 agree very closely, while if we are guided by the actual 

 descriptions we shall be compelled to admit profound dis- 

 crepancies between the various species. 



These views are conclusively supported by the examination 

 of this new species, which shows the leading characters in a 

 remarkably clear way. 



This species is of considerable size, measuring 380 millim., 

 with a diameter of 13 millim. (at the level of the clitellum). 

 There are only 170 segments. 



The colour (in spirit) is brown all over the praeclitellian 

 region ; the succeeding part is brown only on the dorsal side, 

 the remaining portion being much lighter coloured. 



The first segment, which is only partially introverted, is 

 very short, pale, and of a soft consistence ; the second seg- 

 ment, too, is short, but it is already brown- coloured and more 

 consistent ; the third segment is quite normal and carries the 

 first pair of nephridiopores. These pores are connected with 

 the mouth by a longitudinal (nephrobuccal) groove, which is 

 well marked on the second somite, while on the first somite, 

 owing to its soft consistence, the groove cannot be further 

 traced. 



The prostomium is small and partially retracted. 

 The ventral setse are visible from the third segment back- 

 wards, the dorsal setse from the fourth or fifth ; they are all 

 paired, the dorsals, however, more closely than the ventrals. 

 This applies to the anterior portion of the body; on the 

 posterior portion the two seta? of the dorsal pairs are wider 

 apart than the ventrals, which retain the primitive distance. 

 The lateral interval (be) is a little wider than the ventral (aa). 

 The copulatory seta3, under the clitellum, have a length of 

 about 2 millim.; they are large, sigmoid, provided with a 

 nodulus, and ornamented only on the extreme half of the 

 distal portion with slight and indistinct arches. 



The clitellum ends abruptly on the 27th segment, but its 



