ZooL.-VOL. II.] EISEIV—OLIGOCH.'^TA. 147 



ACANTHODRILIN^. 



Notiodrilus Michaelsen. 



With Dr. Michaelsen (30) I agree to place the American 

 species of the old genus Acanthodrilus in a separate genus. 

 As Dr. Michaelsen's paper (30) arrived just as this manu- 

 script was going to press, there was no time to discuss the 

 subject; I can merely state that in most respects Dr. 

 Michaelsen's re-arrangement of the genera of this family 

 seems admirable. 



Notiodrilus Whitmani, sp. nov. 



Plate XIV, Figs. 163-167. 



Definition. — Length 60 mm., width ly^. mm. Somites about 115. Setae 

 paired. Penial setae very large, smooth, with end knob. No spermathecal 

 sexual setas. Clitellum small, saddle-shaped, XIII-XVI. Prostomium divides 

 somite I, about one-half. Genital zone not prominent. Groups of four to 

 six small papillae in the intersegmental grooves of IX/X, X/XI, XI/XII, in 

 line with the lateral intervals on each side. Intestine without any diverticles. 

 Gizzard in VI. Sacculated intestine commences in XIV. Two pairs of 

 spermathecae, the anterior pair smallest, each with a single diverticle of large 

 size. The spermathecal pores are postseptal. Sperm-sacs racemose, in IX, 

 XI and XII. Loose sperm-mass in X. Testes in X, XI; sperm-funnels in 

 X, XI. Ovaries in XIII, oviducts in XIV. Prostates long, narrow, tubular, 

 much coiled in one plane, each covering two somites. Sperm-ducts do not 

 fuse until the male pore in XVIII. Meganephridia; no peptonephridia. 

 Last hearts in XII. Color pale flesh, without pigment. 



Septal formula: — 



VI/VII, Vll/VIII, VIII/IX, IX/X, X/XI, XI/XII. 



Habitat. — Coban, Guatemala, Central America. 



This species is very abundant in the river near the city 

 of Coban, in the highlands of Guatemala. I found it in 

 the banks of the river, among the roots of plants, etc. It is 

 not strictly an aquatic form. The species is named in honor 

 of Professor C. O. Whitman, to whom the author is in- 

 debted for many courtesies. 



