in d. Naturgesch. d. nied. Thiere währ. d. Jahre 1872—1875. 477 



Proboscis swollen, ribbed. Head with a prominent convex median 

 plate and with a raised border of each side and behind, the lateral 

 and posterior lobes separated by notches. Anal segment funnel- 

 shaped, the edge surrounded by papillae. 



Scionopsis n. gen. e fam. Terebell. Body-segments nume- 

 rous, the 17 following the 3. bearing fascicles of slender setae, 

 the others only small uncinigerous lobes, 2. and 3. segments bearing 

 branchiae and having their anterior margins prolonged into mem- 

 branous collar-like expansions, that of the 2. forming broad lateral 

 lobes behind the tentacles, that of the 3. a dorsal sheath behind 

 the branchiae, beneath which they can be retracted. Branchiae 4, 

 those of the 1. pair larger, (but generally one or more abseilt, or 

 the anterior are smaller, owing to their having been broken off 

 and reproduced,) palmately branched and supported on elongated 

 pedicles. Tentacles numerous, crowded. 



Chaetobranchus n. gen. e fam. Terebell. No blood-vessels, 

 body much elongated, segments very numerous, nearly all bearing 

 fascicles of setae, those of the middle region simple or with more or 

 less branched branchial cirri, each of their divisions tipped with slen- 

 der setae, the first and last ones being smaller and simpler than the 

 rest; anterior and posterior segments without cirri. Cephalic seg- 

 ment expanding into a broad tentacular (frontal) lobe, rounded or 

 emarginate anteriorly, often scolloped laterally. Tentacles crowded, 

 very numerous, long and slender, when distended by the blood. 



Möbius corrigirt die Beschreibung erste d 's von 

 Disoma multisetosum. Thiere der Ostsee a. a. 0. S. 108, 

 Ebenda (S. 110) bemerkt derselbe in Betreff der Pectinaria 

 belgica, dass die Zahl der Uncinizähne manchfach schwanke 

 und desshalb denn auch nicht zur Unterscheidung von 

 Gattungen (Malmgren) benutzt werden können. Ciste- 

 nides hyperborea Mgn. sei von Pect, belgica nicht ver- 

 schieden. Ebenso variabel erscheint auch die Zahl der 

 Warzen an dem Rüssel der Phyllodoceen, die gleichfalls 

 von Malmgren allzu stark betont 'wird. Phyllod. mucosa 

 Oerst., Ph. assimilis Oerst., Ph. Rinckii Mgn., Ph. pulchella 

 Mgn. und Ph. teres Mgn. sind blosse Varietäten von Ph. 

 maculosa Müll. Auch zwischen Antinoe Sarsii Knbg. und 

 Polynoe cirrata Pall. findet Möbius keinerlei wesentliche 

 Unterschiede; er ist sogar der Ansicht, dass auch Laenilla 

 glabra Mgn. und Evarne impar Johnst höchstens als Varie- 

 täten derselben zu betrachten seien. 



Ueber Enipo Kinbergi? Mgn., Aricia sp. n., Ammo- 



Archiv f. Naturg. XXXIX. Jahrg. 2. Bd. FF 



