WORMS, ETC. 519 



f Ore amphoriformi cum apertura in extremitate antica. 



2. Gen. Vortex, Ehrb. 



ft Ore oviformi cum apertura in latere inferiore. 



3. Genus Derostoma (Duges), Oerst. 

 /3. Ore anuuliformi vertical!. 



Subfamilia III. MESOSTOMEJE. 

 t Ore rotundo. 



* Oculis cluobus approxiniatis 4<-5 corporis parteui ab 

 apice remotis. 



4. Genus Mesostoma, Dug. 



** Oculis duobus lion approxirnatis octavam corporis par- 

 tem ab apice remotis. 



5. Genus Stronyylostoma, Oerst. 

 *** Oculi nulli. 



6. Genus Typhloplana, Ehrb. 

 ft Ore ovali. 



7. Genus Macrostoma, Oerst. 

 y. Ore minutissimo nou exsertili. 



Subfamilia IV. MICROSTOME^E, 

 t Corpore lineari subdepresso. 



8. Genus Microstoma, Oerst. 

 ft Corpore longitudiualiter convoluto. 



9. Genus Convoluta, Oerst 



In these genera twenty-one species are described, of which 

 seven are altogether new. Oersted has met with a great 

 part of the Planarice, described by Fabricius and Miiller, in 

 the environs of Copenhagen, which must have much facili- 

 tated to him the recognition of these frequently very briefly 

 described and still more indistinctly figured animals; but, 

 nevertheless, he has not been able to assign a determinate 

 systematic position to eight of the species of Plan aria insti- 

 tuted by those Danish naturalists. 



Various terrestrial Planarioe, of variegated colour, were 

 found by Darwin under rotten wood in South America, 

 New Zealand, Van Diemen's Land, and the Mauritius 

 (Annals Nat. Hist, xiv, 1844, p. 241), which were in all 



