34 THE VOYAGE OF H.M.S. CHALLENGER. 



before this point was cleared up ; but the one figured shows quite distinctly that the pore 

 opens into the peristomial tube immediately above the operculum. Tie younger cells are 

 without pore or avicularium, but the older ones are usually provided with two avicularia. 

 The young cells of this, of Adeonella intncaHa, and of Adeonella polymori^ha are 

 very similar as regards the surface pores. 



When the zoarium is examined from the side, the zocecia of the back and front series 

 are seen to be opposite. 



Specimen examined from Station 135c, 110 fathoms. 



Adeonella (f) regidaris, Busk (PI. II. fig. 35). 



Adeonella regularis, Busk, Zool. Chall. Exp., part x.xx. p. 186, woodcut, fig. 55, pi. xx. fig. 2. 



This diff"ers from the other Adeonellw in having very large zocecia, and the bridge 

 across the aperture is much more slender — in fiict, it should now be called a bar. 

 Besides the avicularia described as " above the mouth," there is very frequently one at the 

 base of the bar, directed towards the aperture. A bar across the aperture occurs in the 

 fossil [Escharipora) ornatissima, Stoliczka,' and also in {Escliara) syringopora, Reuss. 

 (This bar was not described by Reuss, but I have it in well-preserved specimens from the 

 Miocene of Italy.) 



The oral aperture has a narrow sinus, and the tongue of the operculum is very 

 marked, not being quite in the same plane as the disk of the operculum, but is not 

 separated as in Schizoporella cecilii, Audouin. I have not found any mandibles with the 

 trident-shaped basis figured by Busk. 



The general appearance reminds us of Gephyrophora poJymorpha, and it is by no 

 means easy to know where it should be placed, and my judgment would be to call it 

 Schizoporella. 



Cellepora piustxdata. Busk (PI. III. fig. 1). 



Cellepora pustulata, Busk, Zool. Chall. Exp., part xxx. p. 200, pi. xxviii. fig. 8. 



The ovicell is small and recumbent, and on the front, near the opening, has a thin 

 semicircular area. A similar small semicircular mark occurs on the ovicells of many 

 Celleporw, among others, on Cellepora ansata, Busk ; Cellcpora catonensis, Busk ; 

 CeUepo)-a hicornis, Busk. The operculum does not close the ovicell, and shows that the 

 oral aperture is emarginate, and not clithridiate. 



' Olig Bry. von Latdorf, Sit:ungsb. d. k. preuss. Akad. d. IViss., Bd. xlv. p. 86, Taf. ii. fig. 7. 



