A NEW DISCODRILID WORM FROM COLORADO. 



Max M. Ellis, 



Instructor in Biology, University of Colorado. 



The material on which this account is based was received through 

 the kindness of Prof. T. D. A. Cockerel! . It consists of two sets of 

 worms. Forty-five specimens of this Discodrilid were found on two 

 specimens of Camharus diogenes Girard in the University of Colorado 

 museum, labeled "Boulder, Colorado, July 24, 1908." Another lot of 

 about 300 worms came from five specimens of Camharus diogenes 

 Girard collected on the University of Colorado campus, July 9, 1911. 

 One of the crayfish, a medium-sized male, carried quite a number of 

 the stalked eggs of this worm on the underside of its abdomen. The 

 writer is indebted to Miss Margaret Hankins, who discovered this 

 second lot of worms, for information concerning the living animals; 

 to ^Ir. E. Bethel, of East Denver, for carefully preserving these speci- 

 mens; and to Prof. J. P. Moore, of the University of Penns^dvania, for 

 the loan of a valuable reprint. 



All the figures were made from camera lucida drawings, except fig. 4. 



CAM BARIN COLA, new genus. 



This genus is easily distinguished from Bdellodrilus Moore by the 

 nonevei^sible penis, by the eversible bursa, by the simple spermatheca, 

 by the large accessory tube connected with the male reproductive 

 organs in segment 6, and by the absence of the conspicuous, clear, 

 paired, segmental glands in the first nine post-cephalic segments. 

 It is separated from BrancMohdella Odier by the single, median dorsal, 

 pulsatile papilla carrying the single common opening of the anterior 

 nepliridia, by the possession of two pairs of testes and vasa deferentia, 

 and by dissimilar dental plates. 



Type of the genus. — Cambarincola macrodonta. 



CAMBARINCOLA MACRODONTA, new species. 



Type-specimen. — 4.65 mm. body length; Cat. No. 53794, U.S.N.M. 



Cotypes. — Four specimens, 1 to 4.25 mm. body length; Cat. No. 

 53794, U.S.N.M. 



Body rather slender when extended, slightly arched ventrally, cir- 

 cular in cross section in all regions, greatest diameter in the fifth or 



Proceedings U. S. National Museum, Vol, 42— No. 1912. 

 20441°— Proc.X.M.vol.42— 12 31 481 



