ZOOL.— Vol. II.] EISEN—OLIGOGHALTA. 135 



then dip down through the muscular layers and form a 

 small atrium about half as wide again as the sperm-ducts 

 and equaling in thickness that of the epithelium of the 

 clitellum at that place. 



Kerria Beddard. 



Kerria McDonaldi Eisen. 



Habitat. — A pond near Santa Ana, Cape Region, Baja 

 California, Mexico. 



The specimens resemble very closely those found at 

 Miraflores, Baja California. One of the specimens was 

 sectioned, enabling me to add a few particulars to the former 

 description. The intestine possesses a very rudimentary 

 gizzard in somite VII. The circular muscular layer is here 

 about twice as thick as in the somites preceding and follow- 

 ing, and altogether the intestine in that somite is about one- 

 third thicker than elsewhere. The single pair of sperm- 

 funnels is in X. There are no sperm-sacs in any of the 

 somites, only sperm-masses in X and XI. 



EUDRILIN^. 



Eudrilus Perrier. 



Eudrilus Eugeniae (Kinherg), 



Plate VII, Figs. 27-34; Plate VIII, Figs. 40-48; Plate IX, Figs. 49-50. 



Habitat. — The specimens upon which my investigations 

 are based are all from Panama, where they were collected 

 in January, 1896, by Professor Charles H. Gilbert. Thev 

 were preserved in a five per cent, solution of formalin, and 

 were in very good state of preservation, suitable for histo- 

 logical purposes. Judging from the number of specimens 

 in the collection, this species must be the most common of 

 the large terrestrial earthworms in Panama. 



(4) « December 18, 1899. 



