ENCHYTR^ID-(E 



65 



Fig. 34. EnchytrcBus metlahatlensis. 



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. 



Characteristics . — 



The contracted sper- 



mathecEe are charac- 

 teristic of this species. 



Another point of dis- 

 tinction between this 



species and Enchytrceus alaskcz 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- 

 kce., broken up into two 

 groups, one forming a glob- 

 ular projection extending 

 further back toward the pos- 

 terior margin (fig. 34, b). 

 It is not improbable that 

 this peculiarity is of generic 

 importance. 



Intestijte. — There is a 

 thin coating of broad chlor- 

 asfogfen cells in somites VI 

 to IX ; in the other somites 

 no such cells can be seen. 

 Spertnathecce (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. 



Fig. 35. Enchytrmus metlakatlensis. 



