ZooL.— Vol. II.] 



EISEN—OLIGOCHJF. TA . 



121 



From O. guatemalce the species is distinguished by the 

 absence of setae a in XVII. O. mexicanus has no sperm- 

 sacs in IX. The diverticles of the intestine are large and 

 subdivided into longitudinal chambers. 

 Septal formula: — 



IV/V, V/VI, VI/VII, VII/VIII, VIII/IX, TX/X, T/T[. 



The spe7'?n-sacs in IX project from the body-wall near 

 the septum IX/X. 



No ovisacs are present. 



Ocncrodrilus santi ximicri, spennatheca and prostate. 



Ocnerodrilus (Enicmodrilus) comondui, sp. nov. 



Definition. — Length about 60 mm., width \% mm. Somites 80 to 90. 

 Prostomium divides somite I about one-third. Somite I wider than II or 

 III. Setse paired, with undulating margins and five to six direct, transverse 

 lines. No setae ab in XVII. Clitellum saddle-shaped, in XIV-XIX. Somite 

 XIX not wider than the other somites. Sexual zone not sunk, except a trifle 

 between the papillae. Male pores hardly elevated, round, in line with setas ab. 

 Septal glands in VII and VIII of about equal width, those in VI the longest, 

 those in VII a little longer than in VIII. Spermathecae large, broad and with 

 distinct stalk; the pouch with undulating margins. Two pairs of testes and 

 sperm-funnels. Racemose sperm-sacs in IX and XII; the former preseptal, 

 the latter postseptal. Sperm-ducts not thickened at the pores; prostates 



