142 Illinois State Laboratory of Natural History. 



Geodrllus singularis Ude, described from Illinois in 

 1893,* has several characters in which it resembles 

 Diplocardia, but the position of the prostates and of 

 the male pore is different, and no mention of the longi- 

 tudinal grooves is made nor is there any indication of 

 them in the figures. Unfortunately Tide was unable to 

 describe the generative organs fully because of the 

 condition of his specimens. 



Spa/rganophihis eiseni nov. sp. 



The second species to be described is very abundant 

 in the mud of the IlHnois River and of the bottom-land 

 lakes connected with it. Dredging shows it to be dis- 

 tributed over the entire bottom of these bodies of water, 

 although somewhat more abundant near the margins. 

 Specimens have been taken at all times at which collec- 

 tions were made, from April to December inclusive. 

 Their cocoons were most abundant during the month of 

 June, while the clitellum was well developed two weeks 

 earlier. 



These worms agree with Sparganophllus tamesis Ben- 

 ham t in all the characters given by him as generic, and 

 in a number of others as well. The table at the end of 

 this article will be sufficient reference to many of these 

 resemblances, while others deserve more special mention. 



*Bi-itrage zur Kenntnis ausldndischer Regenwu>mer. {Zeit. f. Wiss. Zool.. 

 LVII. Bd.. p. 09.) 



+ "A New English Genus of Aquatic Oligochoeta (Sparganophllus) belonging 

 to the Family RhinodrilidsB." (Quart. Jour. Micr. Sci. Vol. XXXIV.. p. 155; 

 Plates XIX and XX.) 



