im Gebiete der Aulhozoen in den Jahren 1880 und 1881. 555 



Microptilum. Sea pens of the family of Protoptilidae. Polyps 

 with cells, sessile, disposed alternatly on each side of the rachis in 

 one Single row. Cells triangulär with one strong spine on their 

 ventral side. Zooids small, one single individual at the base of 

 each cell on its ventral side. Axis round. Calcareous corpuscules 

 in the rachis, the stalle, the cells, and the tentacles of the polyps. 



Leptoptilum. Sea pens of the family of Protoptilidae. Polyps 

 with cells, sessile, disposed alternately in one single row on each 

 side of the rachis. Cells cylindrical, with eight long spines. No 

 real zooids, but a certain number of rudimentary polyps betwecn 

 each pair of the fullgrown individuals. Axis round, pointed and 

 straight at both ends. Calcareous corpuscules in the stalk rachis, 

 the cells and the tentacles of the polyps. S. gracile. 



Trichoptüum. Sea pens of the family of the Protoptilidae. 

 Polyps with cells, sessile, disposed alternately in one single row on 

 each side of the rachis. Cells cylindrical, with eight strong spines. 

 Zooids dorsal, one to three between the polyps, small, without spines. 

 Axis quadrangular. Calcareous bodies numerous in the cells and 

 tentacles of the polyps, very scarce in the sarcosoma of the rachis, 

 abundant in that of the stalk. 



T. brunneum. 



Scleroptüum. Sea pens of the family Protoptilidae. Polyps 

 without cells, sessile with broad bases disposed on each side of the 

 rachis in a single row. Zooids dorsal apparently in one row. Axis 

 round. Calcareous corpuscules of large size, abundant in the polyps 

 and their tentacles and in the sarcosoma of the rachis; those of 

 the stalk numerous, but smaller. 



Im allgemeinen Theile giebt der Verf. eine neue Eintheilung 

 der Pennatuliden und eine Uebersicht über die geographische Ver- 

 breitung der bis jetzt bekannten Arten. 



Gestützt auf die zahlreichen neu entdeckten Formen konnte 

 das in dem grossen Pennatulidemverke Köllikers gegebene System 

 (pg. 14, 295 und 436) folgendermassen abgeändert werden. 



Order Pennatulida. 

 I. Rachis with a bilateral arrangement of the polyps. 

 A. Rachis elongated, cylindrical. 

 A. A. With pinnules or leaves. 

 Section I. Pennatuleae. 

 Pinnules well developed. 

 Subsection I. Penniformes. 

 Zooids sitnated on the pinnules. 

 Family 1. Pteroeididae. 

 Genera. Pteroeides Herkl. 

 Godefroyia Köll. 

 SarcopUyllum Köll. 



