REPORT ON THE PENNATULIDA. 35 



/3. PolyjDS small. 

 Family 3. Pkotocaulid^. 

 Genera Protocaulon, Koll. 



CladisGus, Kor. and Dan. 



bb. Polyps with cells. 

 Family 4. Peotoptilid^. 

 Genera Protoptilum, KoU. 



Lygomorpha, Kor. and Dan. 

 Microptilwn, KoU. 

 Lejotoptiluin, Koll. 

 Trichoptilum, KoU. 

 Scleroptilum, KoU. 



B. Rachis expanded in the form of a leaf. 



Section II. RENILLE^. 



Family 1. RenilliDxE. 

 GcQus Renilla, Lam. 



11. Rachis with a radiating arrangement of the polyps. 



Section III. VERETILLEiE. 



Calcareous bodies Ions'. 

 Family 1. Cavernulaeid^. 

 Genera Cavernularia, Val. 

 Stylobelemnon, KoU. 



Calcareous bocUes short. 

 Family 2. LiTUiiRiD.^. 

 Genus Lituaria, Val. 



Veretilluin, Cuv. 



Policella, Gray. 



Clavella, Gray. 



With regard to the Geogkaphiual Disteibutiox of the Peunatulida the new forms of 

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

 at which I arrived in my monograph. 



As to their horizontal distribution, I wish to point out first of all tlu- interestino' fact 

 that the rh.m.ngcr Expedition seems to prove that the PeniKituH.hi arr not distributed 



