ENCHYTR^ID^ 



89 



tral glands in XIII, XIV and XV, those in the last two much larger 

 than the one in XIII. The glands are larger than in the species. 

 Nephridia with a thick duct. The middle lobe with slightly lobed 

 margin. Color pale yellowish white (alcoholic specimens) . 



Locality. — Two mature and three immature specimens from St. 

 Paul Island, Pribilof group, Alaska, Prof. Trevor Kincaid (August). 



Fig. 5S. Lumbricillus franciscanus borealis. 



Characteristics. — The principal differences between this variety 

 and the species are as follows : The ventral glands are considerably 

 larger in the variety. The setae in the species are of about equal size 

 in the same fascicle. In the variety L. borealis the inner seta3 in the 

 lateral fascicles and the outer seta in the ventral fascicles are markedly 

 smaller than the other setze in the same fascicle. The width of the vari- 

 ety is about twice that of the species. The ventral anterior fascicles 

 contain one more seta in the variety. 



LUMBRICILLUS FRANCISCANUS UNALASK^ var. nov. 



Text-fig. 59. 



Definition. — Length 17 mm., width 1.2 mm. Somites 72. Setce 



sigmoid, all of the same size in fascicle : ventrals, 4, 6, 6, 6, 6, 6, 



6, 6, 6, o (XIII), 3, 5, 5, 4, 4, 3; laterals, 5, 4, 5, 5, 5, 5, 4, 3, 3, 



3, 3 (XIII), 2, 3, 3, 3, 3. Brain square, posteriorly truncate, ante- 



