KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 15. N:0 7. 29 



The ovaries or eggs in the 9 th and 10 th and ll th segments. The anterior ones 

 are floating. 



The testes in the 7 th and 8 th segments. 



The spines are nearly straight, the inner ones in each fascicle being by far the 

 shortest, about 5. 6. 6. 5 (fig. 23, d and e). 



The segments are well defined, about 45. 



The length of the body about 16 m. m. 



Tlie width of the same about 1 m. m. 



Habitat. This distinct and interesting species was found only on Carlsö in Lof- 

 odden, Norway. 



The integument (not the cuticle) of this species is very tough, and its body is 

 very straight and nowhere bent. Its nearest allied form is: 



7. Neoenchytraeus Ratzeli Eisen 1872. 

 Pl. XII. Fig. 22. 



Syn.: 1872. Enchytrmts Ratzelii Eisen, Öfv. K. Sv. Vet, Akad. Förhandl. 1872. p. 123. 



The supra-oesophagial ganglion is not triangulär, but oblong and both its mar- 

 gins are convex (fig. 22, b). 



The reeeptacle resembles that of the preeeding species, but the tube is more cy- 

 lindrical, of the same thickness at both ends. The matrix on which the bladders are 

 fixed is ringshaped; in the preeeding species it is rather conical (fig. 22, c). 



The segmental organs resemble those of the preeeding species, only the inner 

 tube is longer than the middle lobe (fig. 40). 



The spines are shorter and straighter than those of N. durus and in each fascicle 

 about 7. 8. 8. 7. 



The length of the body about 30 m. m. or nearly twice the length of the pre- 

 eeding species. 



The width of the same about 1 m. m. 



Habitat. Norway and Tromsö. 



This species resembles N. durus in a very high degree, but is principally dis- 

 tinguished through the form of its cerebral ganglion and in a lesser degree through 

 the other characters given. But the close relationship of these two species is evident. 



