the fauna of boulder county 249 

 Suborder Microdrili 



Family AEOLOSOMATID^ (Aphaneura) 

 (93) Aeolosoma Sieb. In 1908 a small freshwater worm, ornamented with minute 

 orange-red spots, was found in Boulder. On sending a sketch to Professor J. P. 

 Moore, he identified it as this genus, stating that the species was probably A. 

 hemprichi. A good account of the genus is given by Beddard in the Cambridge 

 Natural History, Vol. II, p. 374- 



Class HIRUDINEA 



The leeches in our fauna have not been studied. For a useful account of some 

 American leeches see J. P. Moore, Bull. Bureau of Fisheries, XXV (1906). Another 

 important paper by the same author is in Proc. U.S. National Museum, XXI 

 (1898). 



Phylum BRACHIOPODA Dum. 



May occur fossil, but not reported. 



Phylum BRYOZOA Ehrenberg. (POLYZOA J. V. Thompson) 



Not observed. Freshwater forms may be found. 



Phylum ARTHROPODA 

 Class DIPLOPODA (Myriopoda Auctt., part.) 



The millipedes and their allies, cylindrical or more or less flattened animals, with 

 seven antennal joints, are to be separated from the centipedes or Chilopoda, which 

 have numerous antennal joints, and are nearer to the insects. In insects and 

 centipedes the reproductive organs open through a single duct near the hind end 

 of the body; whereas in the millipedes the paired genital ducts open on the 

 anterior region of the body. The classification used for both groups is adapted 

 from the recent synopses by Professor R. V. Chamberlin, and in part from the 

 writings of Dr. O. F. Cook. 



Order MEROCHETA 



Body of 20 (rarely 19) segments, which are complete chitinous rings, without 

 sutures (O. F. Cook). Lateral carinae or projections nearly always present; eyes 

 wanting. 



Family POLYDESMID^ 



A species apparently belonging here occurs in greenhouses in Boulder. 

 In the following orders the body has 30 (rarely 26 or 28) segments or more. 



Order COELOCHETA 



Conotyla coloradensis Chamberlin was described from material collected by the 

 writer in Colorado, but unfortunately Professor Chamberlin fails to cite the local- 

 ity. It belongs to the Family Craspedosomidae.' 

 ' Professor Chamberlin now writes that it was taken at Salina, Boulder County, April, 1907. 



