ENCHYTR^ID^E 



tellum with thin walls XII and XIII. Sexual papillae not present. 

 Septal glands in IV, V and VI ; those in IV the smallest, and those 

 in VI the largest. Peptonephridia consist of one or two short and 

 broad twisted lobes. Brain longer than broad, posteriorly distinctly 

 convex. Dorsal vessel rises in XVI. Intestine without chloragogen 

 cells. Spermathecae 

 short and thick, with 

 one diverticle at the 

 inner apex; the 

 main body connects 

 at its center with the 

 intestine. Sperm- 

 ducts narrow,coiled, 

 confined to XII. 

 Funnels large, three" 



times as long as 



FIG. 37. Enchytrceus kincaidi. 



broad. Penial inner papillae two, the posterior one the largest ; the 

 cells with a feathery and radiating arrangement. Sperm-sacs : one 

 pair connected with the testes, projecting forward into somite X ; 

 no trabecula present. No ovisacs. Nephridia with anteseptal consist- 

 ing only of nephrostome ; duct thin and much coiled. Lymphocytes 

 broad, irregularly ovoid, not large, cyanophil, without eosinophil 

 granules. Color white, body entirely transparent. 



Locality. Popof Island, Alaska, Prof. Trevor Kincaid. Under 

 rocks on the shore. Several specimens in very fine condition. 



Characteristics. As usual the form of the spermathecae is the 

 most characteristic feature. 



DETAILED DESCRIPTION. 



Setae. The setae straight with the basal part considerably curved. 

 All in the same fascicle of the same or nearly the same length ; no one 

 decidedly longer than the rest. 



Clitellum. The wall of the clitellum not more than twice as thick 

 as the general body- wall. Even the body-wall unusually thin. 



Brain (fig. 37, ) Brain as in the other species of this genus 

 described in this paper. A circular mass of fibers at the apex of the 

 inner fiber curve. 



Spermathecce . Several specimens dissected ; spermathecae found 

 to vary but little in form. The lower end furnished with a set of 

 glands near the pore, the glands opening into the duct. The connec- 

 tion with the intestine at the center of the whole organ. A short and 

 thick diverticle points upward and forms the inner apex of the organ. 



