536 Dritter Abschnitt. Systematik. 



Thysanozoon Brocchii, var. papillosiim. 



Thysanozoon papillosiim'), S.\rs-Jensen 1878. 131. i)ag-. 79. Tab. VIII. Fig. 4 — 6 

 (e manuscriptis Dr. M. Sarsii relictis). 



1) »Corpus planum, ovale, tenuissimuni, margiuibus undulatis, supra papillis uumerosis cyliudrifo- 

 conicis, parte interiore obscurioribus, obsessum, subtus leve. Pseudoteutacula marginalia, brevia, rotundato- 

 oblouga, compressa. Color supra aurantiacus, punctis numerosis parvusculis rubris aspersus, in papillis e 

 rubescenti albus, subtus pallide ruber. Oeellorum acervi duo cervicales, ocellis numerosis, oblongi, ad basin 

 versus pseudotentaculorum extensi. Os centrale. Pharynx cylindrica, margine dilatato. Aninialculum ope 

 pharyngis longe protractilis adeo vehementer adhaerere potest, ut difficile abstrahatur. 



Denne nordiske Repraesentant for Thysanozoon -Slaegten liar Sars fandet i to Eksemplarer ])aa 

 Botryller ved Florgen. Dyret kryber meget langsomt.« 



Der Saiignapf ist hier als Pliarynx aufgefasst. 



Thysanozoon Brocchii var. tentaculatum. 



Peasia tentaculata'), Pease 1860. 84. pag. 37. Tab. LXX. Fig. 5. 6. 

 Thysanozoon tentaculatum''), Diesing 1862. 89. pag. 557. 



»Form oval , strongly depressed , smooth , thin as common writing-paper , subtranslucid. Margins 

 strongly undulated. No visible eyes. The anterior end is slightly emarginated, and has two blackish conti- 

 guous tentacular processes, which are non-retractile. The whole upper surface is covered with rather clo- 

 sely set tentacular processes, which are retractile, cylindrically tapering or clavate, and mucronated; the 

 mucronated tips retractile in the large part. No foot or appearance of external brancliiae. Colour above 

 light fawn, with pinkisli margins and darker processes. Beneatli paler than above. This singular animal 

 oecurs rarely under stones at low-water mark. It swims by the undulations of its mautle , and wlien cree- 

 ping the same undulations take place. On close examination of the tentacles, I found them ear-shaped, 

 pointed, grooved laterally, and the papillae on the surface subretractile. When placed in a jar of water 

 a tubulär whitish organ would protrude from the central aperture and act as a sucker. Moutli probably 

 anterior at the base of the tentacles. It is very active and swims rapidly.« — Sandwich Islands. 



2) »Mucrones in apice papillarum fortasse nil aliud quam corpuscula bacilliformia sicut in specie 

 precedente sed extus prominentia.« 



Die folgenden Species gehören mit grosser Wahrscheinlichkeit auch zu dem Geiuis 

 Thysanozoon , obschon sich dies bei dem gänzlichen Mangel anatomischer Angaben nicht 

 mit Sicherheit feststellen lässt. Einige derselben sind vielleicht ebenfalls nur Varietäten von 

 Thysanozoon Brocchii, ich ziehe indessen vor, sie als besondere Arten hier anzuführen, da sie 

 in Form und Färbung des Körpers und seiner Anhänge etwas stärker abweichen. 



113. Thysanozoon australe Stimpson. 

 ') Stimpson 1855. 76. pag. 389. — '^) 1857. 78. pag. 2. 7. — Diesing 1862. 89. pag. 556. 



\] "Oval, rather broad, of a dark colour, mottled with blackish and bro\vnish above; papillae large, 

 about sixty in number, nearly equal in size on all parts of the body. Eyes numerous, in an oval white 

 patch between the bases of the tentacula, which is nearly divided in two by a wedge-shaped clear space 

 entering from behind. Length 1 , breadth it,(> inch. Found on soft sponges in the circumlittoral zone. 

 Hab. Australia, at Port Jackson.« 



