60 On the Vermes collected in the Sea of Spitzhergen. 



tion these stand to the Spitzbergen form ; and I may mention 

 that, with regard to the structure of the oesophageal teeth, the 

 animal now before me occupies a middle place between the 

 forms from Kiel and Danzig ; for in this animal, which is 19 

 millims. long, I count, as in the Kiel variety, 8 series of 

 large, readily recognizable oesophageal teeth, which bear on 

 each side near the principal point 2-4 subsidiary teeth, and 

 therefore in all, like the Danzig form, 8-10 subsidiary teeth. 

 But as I have only a single small specimen from the coast of 

 Spitzbergen, no great importance is probably to be attached 

 to this observation. 



Nemertina. 



The few Nemertina found I have been unable to identify 

 with those already described ; but here we must take into 

 consideration that many of the existing descriptions are by no 

 means of such a kind that determinations can be made by 

 them with certainty, especially when, as in the present case, 

 we have to do with worms which are preserved in spirit. It 

 is to be hoped that the Arctic Platyelmia may soon find a 

 worker as trustworthy as the Annelides have done, and to him 

 it must be left to decide whether I am in the right in pro- 

 posing new names here. The generic division has been made 

 in accordance with Keferstein's work. 



Nemertes maculosa (mihi). Zweigletscherbucht. 



Worms 25-40 millims. in length, nearly cylindrical, thickest 

 in the anterior half of the body (2-4 millims.), scarcely 

 narrowed towards the anterior end, gradually and but slightly 

 narrowed towards the posterior end. Colour dirty whitish, 

 more or less reddish brown, generally pigmented in spots ; 

 surface in strongly contracted parts of the body closely trans- 

 versely ringed. The short acutely conical cephalic extremity 

 without eyes, with a longitudinal fissure on each side running 

 from the buccal orifice nearly to the apex, but not attaining 

 the orifice for the proboscis ; orifice for the proboscis terminal ; 

 proboscis longer than the body, cylindrical, filiform (0*5 mil- 

 lim. in thickness), without armature, with low papillse ar- 

 ranged in rows. 



The animals differ from Nemertes fusca (Fab., Leuck. Arch, 

 fur Naturg. 1849, xv. part 1, p. 152) by the lateral fissures of 

 the head not reaching so far. 



Nemertes teres (mihi). Zweigletscherbucht. 



Worm 50 millims. in length (although, perhaps, a piece of 

 the caudal end is wanting), cylindrical, thicker in the ante- 

 rior third of the body (4 millims.) than in the portion towards 

 the caudal extremity, which is of nearly uniform thickness 



