REPORT ON THE ALCYONARIA. 



xxvu 



irregular number of septa-like parietal ridges. Calyces and coenenchymatous tubes are 

 closed below by a series of transverse floors. The polyps are completely retractile, and 

 the tentacles are invaginated. The opening of the pockets, which ensheath the 

 ca3nenchymatous tubes, is closed by a layer of delicate tissue. Communication between 

 the individual tubes, and between them and the calyces, is established by a system of 

 delicate, membranous, transverse canals. 



Heliopora, Blainville, Manuel d'Actinologie, p. 392 ; Milne-Edwards, Hist. Nat. des 

 Coralliaires, t. iii. p. 230; Moseley, Phil. Trans., vol. clxvi. 1876, pt. i. p. 91 ; 

 Moseley, Zool. Chall. Exp., vol. ii. pt. vii. p. 103. 



Order II. PENNATULACEA, Yerrill. 



Pennatularea, Verrill, Proc. Essex Inst, vol. iv. p. 148. 

 Fennatulida, Kolliker. 



The Pennatulacea may be derived, as Kolliker has shown, from Cornularid forms, 

 among which the remarkable genus Pseudogorgia, Kolliker, may serve as a transition 

 link. For details of this order we refer to KoUiker's monograj)h.^ For the sake of 

 completeness, however, we here append the classification given by Kolliker in his 

 Report ^ on the Challenger Pennatuhda, with modifications due to the labours of Verrill,^ 

 Koren,* and Danielssen.* 



Section I. PENNATULACEA. 

 Subsection I. Penniformes. 



Family I. Pteroeidid^. 



Pteroeides, Herkl. | Godefroyia, Kcill. 



Sarcojyhyllinn, KoU. 



Pennattda, Lam. 

 Sciophyllum, Verr. 



Family 11. P e n n a t u l i d .e. 



Ptilosarcus, Gray. 

 Halisce2)trum, Herkl. 



* Kolliker, Ajiat. systemat. Beschreib. d. Alcyon., 1870. 



* Kolliker, Zool. Chall. Exp., vol. i. pt ii. 



' Verrill, Amer. Joum. Sci. and Arts, vol. xxiii., April 1882 ; BulL Mits. Comp. Zool., vol. xi. No 1, 18b3. 



* Koren and Daniel.ssen, Nye Alcyonider, Berjjeiis Museum, 1883. 



' Danielssen and Koren, Norske Nordhavs-Exped., Fennatulida, 1884. 



