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REPORT ON ZOOLOGY, MDCCCXLIV.

Twenty-three to twenty-five species are enumerated inthese five genera, including scarcely any than marine Pla-narise, amongst which are two new species, Leptoplana nigri-punctata and Typhlolepta cmca, from the coast of Denmark.The description of the family Dendroccela runs as follows :

Corpus plerumque valde depressum. Tubus cibariusramosus. Oris apertura in medio vel post medium corpus.Os cylindricum in cavitate propria liberum, margine tantumposteriore ad tuhum cibarium affixum, valde exsertile.

Dispositio Generum.

1. Corpore lineari, oculo unico.

1. Genus Monocelis, Ehrb.

2. Corpore oblongo oculis duobus aut multis.

a. Oris apertura in medio corpore.

* Tubi cibarii ramis arbusculiformibus.

2. Genus Dendroccelum, Oerst.

** Tubi cibarii ramis indivisis oviformibus.

3. Genus Planaria (Muller), Oerst.

b. Oris apertura extremitati posticse proxima.

4. Genus Telostoma. Oerst.

Oersted enumerates eleven different species in this family,one of which is new. Besides the well-known freshwaterPlanaria:, we also find amongst them some marine forms.The family Kliabdoccela, lastly, is thus described :

Corpus subdepressum vel tereticusculum. Tubus cibariussimplex. Apertura oris terminalis vel infera. Os ampho-riforme vel annuliforme, minus liberum quam in familiaantecedenti.

Dispositio Subfamiliarum et Generum.

a. Ore cylindrico liorizontali.

a * Oris apertura terminali.

Subfamilia I. Prostome.e.

1. Genus Prostoma , Oerst non Duges.

a** Oris apertura non terminali.

Subfamilia II. Derostome.e.