I20 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



a' . Sperm-sacs in IX and XII. 



b. Margins of setae undulating. No tubercle at male 

 pore. 

 One pair of prostates. O. Hendriei Eisen. 



O. comondui, sp. nov. 

 Two pairs of prostates. O. limicola Eisen. 

 b' , Setae with even margins, but with a lunate cavity at 

 apex. O. paraguayensis Rosa. 



b" . Betas with even margins. Male pores on large tuber- 

 cles. O. tuber culatus, sp. nov. 

 b'" . Setae with even margins. Sexual zone sunk. 



O. santi xavieri, sp. nov. 

 ir Setae a absent in XVII. O. Beddardi Eisen. 



11" Setae b absent in XVII. 



Prostate minute. O. guatemalcs Eisen. 



Prostate large. - O. sonorcB Eisen. 



Ocnerodrilus (Enicmodrilus) santi xavieri, sp. nov. 



Definihon. — Length 35-40 mm., width i>( mm. Somites about 80. Pro- 

 stomium divides somite I about one-half. Somite I about twice as wide as 

 somite II. Setje paired, ventral and dorso-lateral, with smooth margins. 

 No setae ab in XVII. Clitellum saddle-shaped, XIV->^ XIX. Somite IX 

 only a little wider than any other near somite. Sexual zone sunk below the 

 general surface of the body. Male pores on two, hardly elevated, papillae, 

 in line with setae ai^, rounded. The two anterior septal glands of about equal 

 length and thickness; the third pair, in VII, is longer, but narrower; the 

 fourth pair is much the shortest, or about half as short as the third pair. 

 Spermathecas large, with distinct duct and a pouch with undulating outline. 

 Two pairs of testes and sperm-funnels. A pair of anteseptal, racemose 

 sperm-sacs in IX, and a postseptal, racemose pair, in XI. Sperm-ducts, not 

 thickened near the pores, opening in the same pores as the prostates. The 

 prostates are hardly wider than the sperm-ducts, straight, and not extending 

 beyond the centre of XVIII. No dorsal pores. Meganephridia thickly 

 covered with capillaries; a large coelomic mantle. 



Habitat. — This is the most common earthworm and the 

 only Ocnerodrilide found in Baja California in the vicinity 

 of Loreto and San Xavier. It occurs there in the moist soil 

 in every garden and along every irrigation ditch. Collected 

 June 22, 1899. 



Characteristics. — Most of the species of the subgenus 

 Enicmodrilus are closely related and only the nicest 

 distinctions serve to distinguish them. O. santi xavieri 

 differs from O. Hendriei in its spermathecse, which are 

 much larger, being furnished with a comparatively long, 

 muscular stalk, which is almost wanting in the latter species. 



