HANSEN: ON SIX SPECIKS OF KÜKNENIA. 235 



sometimes the number is very small, sometimes much larger; I 

 considered them to be blood-corpuscles and other bodies of 

 accidental origin, and they cover a small or an exceedingly small 

 part of the inner surface. Therefore I did not consider them 

 as contents really belonging to the sacs. Finally I will say that 

 the interpretation of these pouches as lung sacs is not very pro- 

 bable, and that a new and more detailed study of them on fresh 

 material is very desirable. 



The author describes and figures the surroundings of the 

 genital aperture in both sexes. But the description and the 

 figure of the anterior genital lobe in the female is not correct; 

 the essential fault is that too numerous setae have been drawn, 

 and that their position is partly erroneous. (I regret that I have 

 not figured the distal part of the anterior genital lobe of almost 

 all the species with a high degree of enlargement and in the 

 same depressed position.) I am not able to understand the 

 description and the figure of the ventral portion of the second 

 abdominal segment in the male; both are misleading, and the 

 author mentions only »ten papillae», each terminating in a »spine», 

 but I have discovered fourteen: my fig. i b on pi. 3 exhibits 

 the seven processes belonging to the let\ side in their natural 

 position, and the terminal portion of the lobe is also seen. Her 

 description of the arrangement of the hairs on the second seg- 

 ment is wrong; the reader is especially referred to my mention 

 of the ventral hairs on p. 224. — The description of the hairs 

 and setae on the ventral side of the fourth, fifth and sixth abdo- 

 minal segments is correct; her fig. i exhibits the arrangement 

 of these hairs rather well, but most of the hairs are drawn too 

 long, and on the ninth, tenth and eleventh segments too few 

 have been indicated. I mention these details because they offer 

 specific characters. 



Perhaps these critical remarks will be found a little too 

 lengthy. But I have wished that the base, which I hope to have 

 laid down for die systematic study of the forms of this difficult 

 order, should be as solid as possible in all respects. 



The author writes (p. 626): »I have succeeded in tracing 

 the pair of tubular glands, »tapezzata d'un semplice strato di 

 cellula epiteliali», of which Grassi speaks. According to him, 



43 



