192 CALIFORNIA ACADEMY OF SCIENCES. {Proc. 3D Ser. 



IX preseptal, one pair in XII postseptal. Prostates with many folds at 

 right angles. Spermathecae, three pairs in VII-IX, sac-like, gradually nar- 

 rowing duct, oblong diverticle. 



Habitat. — Havana, Illinois. Four specimens (size 90x2 

 mm.) from this locality, kindly sent me by Professor Frank 

 Smith of Champaign, Illinois. Three of the specimens are 

 adult. 



No attempt was made to section and dissect the speci- 

 mens. They were labeled by Professor Frank Smith and 

 determined by him. They are much longer than Ude's 

 specimens and also narrower. In the table of species I 

 have retained the description given by Ude, as future 

 investigation of the Havana specimens may reveal 

 differences. 



Genital Zone. — The genital zone agrees in a general way 

 with the figure given by Ude, but differs in one point. There 

 is a very marked depressed area of oval shape occupying 

 the ventral side of somites XVIII to ^ XXI, just posterior 

 to the clitellum. When the worm is viewed from the 

 ventral side this area is seen to occupy about one-half the 

 width of the somite; that is, there is left on either side of 

 the depression about one-quarter of the width of the somite. 

 There is a very slight ridge bordering the depression, which 

 is well defined and sufficiently deep to appear quite dark. 

 There are two pairs of papillae, one pair in XX/XXI, the 

 other in the groove separating XVII/XVIII. 



Anterior Somites. — The prostomium divides somite I 

 about three-fourths. Somites I and II are about one-half 

 as wide — in direction of head to tail — as somite IV. Somite 

 III two-thirds as long as IV. These anterior three 

 somites are thus distinctly shorter than the following ones. 

 The anterior nine somites are more or less corrugated; 

 the others are smooth. The clitellum occupies dorsally 

 % XIU-}4 XVIII, ventrally y^ XIII-S^ XVII. In XVII 

 the clitellum leaves a ventral space occupied by the anterior 

 pair of the papillae. One specimen does not possess any 

 papillae. 



