226 D i e s i n ^. 



2. Tricelis qoadripunctata DIESING : Syst. Helm. 1. 190. 

 Habitaculum. Iiiter Ulvam Linzam, Hafniae (Fabricius). 



3. Tricelis obtosa. 



Corpus planum, capite et extremitate postica obtusis, album. 

 Ocelli subfrontales. Os retro corporis medium situm, oesophago sub- 

 globoso? Longit. 1— l'/a'", latit. Vs— Vs'" 



Mesostoinum obtusum Schnitze: Beitr. Turbell. S4. Tab. V. i. 



Habitaculum. In fossa, Julio, specimina duo, propeGryphiam 

 (Schultze). 



ttt Ocelli 4. 



XIII. VORTEX HEMPRICH et EHRENBERG. Cliaractere amplific. 



Planaria Müller. — Vertex Heinpr. et Ehrenb. — Tetracelis Hempr. et Ehr. — 



Prostoma Le/'dy. — Pseudostomiim, Hypostomum et Trigonostomum 0. Schmidt. 



— Telostomum et Cylindrostomum Uersied. — Allostoma Beneden. 



Corpus teretiusculum v. depressum. Caput corpore continuum. 

 Os ventrale, superum subterminale, v. antrorsum v. in medio fere cor- 

 poris V. retrorsum situm, oesophago amphoraeformi, subgloboso vel 

 cylindrico, protraetili v. haud protractili. Ocelli qiiatuor in quadran- 

 gulum dispositi, interdum bini lineola curva nigra longitudinaliter 

 juncti, quasi semilunati. Androgyna. Apertura genitalis retrorsum 

 sita. Anus nullus. Aquarum duicium aut maris incolae. 



' Os antrorsum situm, imo subterminale. 

 Vortex Hempr. et Ehrenb. 



1. Vortex troncatus HEMPRICH et EHRENBERG. — Dies. Syst. 



Helm. I. 229. adde : 



Schmarda: in Denkschr. d. kais. Akad. VJI. 7. — 0. Schmidt: in 



Sitzungsb. XXV. 87 et in Denkschr. XV. 22. 

 Planaria cuneus Dalyell: Powers of the Creator II. 121. Tab. XV. 15. 16. 

 Vortex truncatus? Leuckart: in Troschel's Arch. 1859. II. 183. 



Habitaculo adde: In aqua stagnante, Februario prope 



Alexandriam (Schmarda) — in Scotia (Dalyell) — prope Cra- 



coviam (0. Schmidt). 



2. Vortex pictas o. SCHMIDT. — Dies. Syst. Helm. I. 230. adde: 



0. Sch?nidl: in Sitzungsb. d. kais. Akad. XXV. 87 et in Denkschr. XV. 

 24 et 46. Tab. I. 5—9 (anatom. et physiol.). 

 Habitaculo adde: Prope Cracoviam (0. Schmidt). 



