252 CALIFORNIA ACADEMY OF SCIENCES. 



much twisted and confined to two somites. In the inner 

 couple of setce in somite xvii the outer seta is wanting. 



The oesophagus is greatly nipped b}^ the septa, is much 

 sacculated and is wider than in any of the other species. 

 The clitellum is very short comprising xiv, xv, xvi, xvii, 

 as in O. agricola. 



The most characteristic features of Ooierodrilus sonorce 

 are : the very large sperm-sac in xii ; the sacculated oeso- 

 phagus ; the form and size of the spermatheca. 



Habitat. In moist soil near irrigation canals in San 

 Miguel de Horcasitas. Sonora, Mexico. As Ocnerodrilus 

 Bcddardi appears to be confined to the Cape region of 

 Baja California in the vicinity of San Jose del Cabo, so 

 is O. soiioric to date onh' found on the mainland of 

 Sonora, Mexico. 



Ocnerodrilus Hendriei, 11. sp. Fig. 38, 39. 72, 77, 83. 



Clitellum begins at the center of xiii and extends to 

 center of xviii. thus comprising four whole and two half 

 somites. 



Size of worm about 1% inches by 3/ line. 



Spermathecal pore in somite ix as usual. 



Ovipore in xiv and sper mi ducal pore in xvii as usual. 



The inner couple of the setee in somite xvii is wanting. 



The septal glands differ from those of other species 

 described in this paper. The anterior one in somite v 

 is large, much larger than the one in somite vi. This 

 again is much larger than the one in somite vii w^hich 

 again is of nearly the size as the one in somite viii, both 

 being very small. The characteristic points in these 

 glands are thus the unusually small size of the two pos- 

 terior glands in somite vii and viii or in fact the com- 

 paratively small size of the three posterier glands com- 

 pared to the anterior gland in somite v, this gland being 



