REPORT ON THE PENNATULIDA. 35 



/3. Polyps small. 

 Family 3. Protocaulid.e. 

 Genei'a Protoccmlon, KoU. 



Cladiscus, Kor. and Dan. 



bb. Polyps witli cells. 

 Family 4. Protoptilid.e. 

 Genera Protoptilitm, KoU. 



Lygomorplia, Kor. and Dan. 

 Microptilum, KoU. 

 Leptop>tilwn, KoU. 

 Trichoptilum, KoU. 

 Scleroptilum, KoU. 



B. Rachis expanded in tlie form of a leaf. 



Section XL RENILLE^. 

 Family 1. Renillid^. 

 Geaus Renilla, Lam. 



II. Rachis with a radiating arrangement of the polyps. 



Section III. VERETILLE^. 



Calcareous bodies long. 

 Family 1. Cavernulaeid^. 

 Genera Cavernularia, Val. 

 Stylobelemnon, KoU. 



Calcareous bodies short. 

 Family 2. Lituarid^e.. 

 Genus Lituaria, Val. 



Veretillum, Cuv. 

 Policella, Gray. 

 Clavella, Gray. 



With regard to the Geographical Distribution of the Pennatulida the new forms of 

 the Challenger Expedition are of great interest, and confirm and extend the conclusion 

 at which I arrived in my monograph. 



As to their horizontal distribution, I wish to point out first of all the interesting fact 

 that the Challenger Expedition seems to prove that the Pennatulida are not distributed 



