WORMS, ETC.

519

f Ore amphoriformi cum apertura in extremitate anticfi.

2. Gen. Vortex, Ehrb.

ft Ore oviformi cum apertura in latere inferiore.

3. Genus Derostoma (Duges), Oerst.(3. Ore annuliformi verticali.

Subfamilia III. Mesostome,®.t Ore rotundo.

* Oculis duobus approximatis 4-5 corporis partem abapice remotis.

4. Genus Mesostoma, Dug.

** Oculis duobus non approximatis octavam corporis par-tem ab apice remotis.

5. Genus Strongylostoma, Oerst.

*** Oculi nulli.

6. Genus Typhloplana, Ehrb.

ft Ore ovali.

7. Genus Macrostoma, Oerst.y. Ore minutissimo non exsertili.

Subfamilia IY. Microstomeje.t Corpore lineari subdepresso.

8. Genus Microstoma, Oerst.tf Corpore longitudinaliter convoluto.

9. Genus Convoluta, Oerst

In these genera twenty-one species are described, of whichseven are altogether new. Oersted has met with a greatpart of the Planarise, described by Fabricius and Muller, inthe environs of Copenhagen, which must have much facili-tated to him the recognition of these frequently very brieflydescribed and still more indistinctly figured animals; but,nevertheless, he has not been able to assign a determinatesystematic position to eight of the species of Planaria insti-tuted by those Danish naturalists.

Various terrestrial Planarise, of variegated colour, werefound 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