ENCHYTR^EID^E 



FIG. 34. Enckytrceus metlakatlcnsis. 



elongated ovoid, with the apices sharply pointed. Nephridia with a 



small anteseptal consisting of nephrostome ; the duct is strong, with a 



lumen much wider 



than that of the main 



body of the nephrid- 



ium ; the duct in the 



main body tightly and 



apparently irregularly 



folded. 



Color gray. 

 Locality. Metla- 



katla, Alaska, June 4, 



1899. Found under 



sea- weeds, by Prof. 



W. E. Ritter. 



Cha racteristics. 



The contracted sper- 



mathecae are charac- 

 teristic of this species. 



Another point of dis- 

 tinction between this 



species and Enchytrceus alaska is seen in the two penial papillae, 



which are of equal size and further apart than in the present species. 

 Brain. The structure of the brain offers some points of interest. 



The fibers, which in other genera form a solid convex band, are in 



this, as well as in E. alas- 

 k<z, broken up into two 

 groups, one forming a glob- 

 ular projection extending 

 further back toward the pos- 

 terior margin (fig. 34, 6). 

 It is not improbable that 

 this peculiarity is of generic 

 importance. 



Intestine. There is a 

 thin coating of broad chlor- 

 agogen cells in somites VI 

 to IX ; in the other somites 

 no such cells can be seen. 

 Spermathecce (fig. 36). The pore connecting with the intestine is 



not at the apex of the pouch, but situated on one side, as shown in fig. 36. 



Fio. 35. Enchytraus mctlakatlensis. 



