86 



EISEN 



lobe being narrow, of rather even thickness, and at the apex capped 

 by the usual sperm-sac. 



Ovaries multi-lobed, large, occupying all the available space in 

 somite XII. 



Ventral glands (fig. 53, c). — The glands in the respective somites 

 of nearly equal size ; the most anterior one the smallest and the fourth 

 in order the largest. The individual glands smaller than in L. fran- 

 ciscanus and in L. santceclarce. 



Setce.^-'Yh^ number of setJE in the fascicles seems to be variable. 

 Of the two counts given the higher number is the most common. 



LUMBRICILLUS FRANCISCANUS sp. nov. 



pi. XIII, figs, I and 2 ; text-figs. 55-57. 



Definition. — Length 10 to 12 mm., width .75 mm. Somites 39 

 to 58. Setae : ventrals, 6, 5, 4, 3 ; laterals, 4, 3, 3, 2. The lateral 

 interval about double the width of the ventral interval. The setae in 

 each bundle of nearly equal size. Head-pore large, between prosto- 

 mium and somite I. Prostomium round, blunt. Clitellum XII and 



XIII. Copulative papilla small. 

 Septal glands in IV to VI. Brain 

 strongly emarginated posteriorly, 

 about thirty units long by fifteen 

 wide at center. Dorsal vessel rises 

 in XIV or XV. Intestine with a 

 thin layer of chloragogen cells. 

 Spermatheca with an oval ampulla 

 and a thin straight duct, the latter 

 surrounded along its whole length 

 by a conical shaped agglomeration 

 of glands. Sperm-ducts thin and 

 long. Sperm-funnels about twice as 

 long as thick. Ventral glands in 

 somites XIV, XV and XVI, in- 

 creasing in size posteriorly. Ovaries in XII, testes in XL The testes 

 lobes are short, rounded, pear-shaped. Nephridia are longer than 

 broad. Lymphocytes oval, varying considerably as regards size. 



Locality. — Santa Clara River, California, in the moist soil of the 

 banks. 



Characteristics. — The species is distinguished principally by the 

 form of the spermatheca and the glands at the base. In P. santx- 



FiG. 55. Lumbricillus franctscanus. 



