264 



Annelida Chcetopoda 



ternal organs showing through. Alimentary canal sur- 

 rounded, except for a short distance in front, by a yellow 

 glandular mass which is divided on each side of the middle 

 line into semicircular lobes or plates of varying thickness. 

 First third may be regarded as made up of fourteen or 

 fifteen segments, but the segmentation is very obscure. 

 On most specimens there are peculiar bodies on thirteen 

 segments, beginning with the second, appearing as lateral 

 circular elevations with raised margin, concave, centre 

 occupied by a minute elevated point. I know nothing as 

 to the function of these bodies which are not found on 

 some specimens, segmentation could be made out 



along the middle third of fresh specimens. In alcoholic 

 specimens, on the ventral surface, lines of division can be 

 seen, but they are very obscure. The posterior third is 

 light gray, with brown specks, opaque, and terminates in a 

 clear white anal segment. 



Segments clearly defined, short, numerous. The anal 

 aperture has a minutely crenulated margin. 



The entire body is covered with narrow, raised trans- 

 verse lines, made up of minute verruciform bodies; these 

 are less apparent on the middle third than elsewhere. In 

 living specimens a narrow, raised, flattened band occupies 

 the middle line of the ventral surface. In alcoholic speci- 

 mens the ventral surface is much depressed, and an elevated 

 rounded ridge on each side separates it from the lateral 

 surface. 



Setse. After careful examination of many specimens I 

 believed that this species was without setae. Afterwards 

 I found a single fascicle of six setse, one of which is re- 

 presented in f. 148. Malmgren assigns to Lysilla six 

 setigerous segments. I am unable to say how many 

 segments of this species are setigerous, but have referred 

 it to Lysilla because in all other respects it agrees with 

 that genus. 



