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front of the mammille, not so far from the median 
line on each side 1 long and | shorter fissure; a little 
in front of these 2 transverse fissures placed near each 
other; then spread on the lower side of the abdomen, 
except on the portion lying in front of and between 
the lungs, c. 20 very small transverse fissures being 
partly longer than the diameter of the insertion of the 
hairs. (I have found nothing on the dorsal side of the 
abdomen). 
The mammille. On the anterior (lower) side 
of the basal joint of the foremost mammilla ce. 5 spread, 
very short longitudinal fissures, on the posterior side at 
least 1 fissure. 
On the anterior side of the hindmost mammilla at 
least 1 short longitudinal fissure. 
This supplement to Gaubert is, as may be seen, 
rather considerable; the most important point is, however, 
the discovery of a true compound lyriform organ on 
the stalk of the abdomen, besides the pointing out of 
both long and short fissures on the lower side of the 
abdomen and of short fissures on the mammille, the 
cephalothoracie shield and labium. This supplement is, 
I think, of great importance for a comparison between 
Aranece and the above discussed orders. 
VII Acari. 
Gaubert denies the occurrence of lyriform organs 
in this order. I have quite in vain searched for them 
in Jxodes ricinus L. and in a large African Trombidium. 
I believe that I have found some spread, very tiny 
fissures on the shield of an Oribates (s. lat.) and a 
most remarkable transverse fissure on the legs. Thus 
