Further Observations on Koeuenia. 429 



K. wlieeleri likewise possesses the greatest number of lateral sense 

 Organs. It is tlie appearance of the abdominal sacs in K. wlieeleri 

 and K. chüensis that is difficult of explanation. Wliy these organs 

 slionld seem to be so absolntely essential in two species of a family 

 when they do not even appear in the others is somewhat singiüar 

 to say the least. That they are so essential to K. ivJieeleri, I take 

 it, is shown from the fact that in the very small specimens of 

 K.parvula they appear in the place of the reproductive appendages 

 but function in their own capacity. When they are crowded out 

 from these two segments they appear on the foiirth and fifth segments 

 and as the animal grows larger, to maturity, these appendages appear 

 likewise on the sixth segment. If such organs are respiratory in 

 function why should they not appear in all the other species, which 

 live under the same conditions? 



In conclusion I wish to thank Dr. AVheelek, under wliose 

 direction I was given courage to continue my work, for the aid so 

 freely and untiringly given me, and for a collection of Solpu- 

 (jida made in the Trans-Pecos region. To my friend and co-worker, 

 Miss HoLLiDAY, and to my friends, the Misses Rhine, I am greatly 

 indebted for much of my material which was taken at a time when 

 it was anything but pleasant to collect in Central Texas. 



Austin, July 3, 1902. 



