526 Diesing. 



c) Ocellorurn acervi tres et simul ocelli marginales sp. 60. 



d) Ocellorurn acervi quatuor; oeelli marginales nulli sp. 61 — 64. 



"* Os retrorsum situm; ocelli marginales nulli sp. 6S. 

 II. Leptoplaiiae otolitliis instrnctae sp. 66. 

 Species in dispositione hujus generis dubiae sedis sp. 67 — 70. 



I. Leptoplaiiae otolitliis iiullis instructae. 

 * Os in mt'dio fere corporis *). 

 aj Ocellorurn acervus unicus et simul ocelli marginales. 



1. Leptoplana Dröbacheasis OERSTED. 



Corpus ohlongum, supra fusco maculatum, vitta mediana palli- 

 diore, subtus alboflavescens. Ocellorurn 1 miilto majonim acervus 

 cervicalis triaugiilaris; ocelli marginales minores numerosi, in lineam 

 dispositi. Os in medio fere corporis (?). Longit. 4'", latit. 1 3/4'". 

 Leptoplana Diöbachensis Oersted: in Kroyer's Naturhist. Tidssk. I. (1844 

 —1845), 41ä. 

 Habita cuium, DrÖbak prope Christianiam (Oersted). 



2. Leptoplana ophryoglena. 



Corpus planum oblongo-ovale, supra obscure ochraceum macu- 

 lis flavo-brunneis, irreguiaribus, vitta mediana pallidiore, marginibus 

 flavo-brunneis, subtus pallide flavo-cinereum. Ocellorurn acervus cer- 

 vicalis circularis; ocelli marginales 12 — 14 in lineam unicam antice 

 interruptam dispositi. Os in medio fere corporis. Aperturae genitales 

 approximatae. Longit. 21/3", latit. 15"'. 



Polycelis ophryoglena Schmarda: Neue wirbell. Th. I. 1. 20. Tab. III. 41. 



Habitaculum. In oceano pacifico prope Paita ad oras Peru- 

 viae (Scbma rda). 



b) Ocellorum acervi duo unacuin ocellis marginalibus vel absque ocellis 

 marginalibus. 



a) Ocelli marginales nulli. 



3. Leptoplana flcxilis DIESING: Syst. Helm. I. 194. adde: 



Planaria flexilis Dalyell: Powers of the Creator 11. 102—104. Tab. XIV. 



17 — 27. — Thompson: in Ann. nat. bist. III. 334. — Gosse: Brif. 



Mar. Zoo). I. f. 126. 

 Elasmodes flexilis Stimpson: Prodr. I. 3. 

 Leptoplana flexilis Leiickarl: in TroscbeFs Arcb. 1839. II. 183. 



1) Oesophagus apice retiorsum directus. (). Sc liiiiid t : in Zeitschr. für wisseascliiifll. 

 Zool. XI. 7. 



