20 idaionkid-t;. 



Honiera foliacea, Jlaci/i/liiu-ai/. 



? Ketihomera deiitata, Kirchenpaur. 



F Retiliornera plicata, id. 



Htth. South Australia (Gould, M'GiUivr(i)j). 



Several dift'erent forms of fenestrate Hurnerce occur in the fossil 

 state iu Australia, probably of Miocene age ; and it would seem not 

 improbable that there may be more than one still living in those 

 seas ; for I am by no means certain that the form to which I have 

 applied Mr. M'Gillivray's appellation may not be distinct from that 

 intended by him. From the description given by Mr. M'Gillivray 

 it seems, however, that the main difference between the form de- 

 scribed by him and a species with which I have been abundantly 

 furnished by Mr. Gould is in the si/e of the fenestras, and the ab- 

 sence of the peculiar delicate spines with which the sides of the 

 fenestrae, in the perfect condition, are furnished. These delicate 

 processes are so readily broken off, and in fact so frequently absent, 

 that the character they afford may be readily overlooked (Plate XIII. 

 ligs. 1, 2). It is also" not improbable that the size of the fcnestra3 

 may vary considerably ; so that it is perhaps better to await further 

 evidence before setting up a new species upon such variable 

 features. 



Herr Kirchenpaur's geuus lietihornera would, from his descrip- 

 tions, appear to include some Escharidan or Cheilostomatous forms 

 approaching Reiepora ; but amongst them his R. dentata an^ plicata 

 appear without doubt to be Cyclostomatous ; and I have therefore 

 ventured to appropriate his expressive appellation for the fenestrate 

 forms of Iloniera, not regarding it, however, as impossible that the 

 fossil genus FenestcUa may have a prior claim after all. 



4. PUSTULOPORA, BlainviUe. 



Zoarium simple or branched ; branches cylindrical, clavate, or 

 terete, composed of tubular cells which ojjen on all sides. 



Pustulopora (pars), Slainv. Man. d'Act. p. 418 (18.34); M.-Edw. 



I. c. p. 27 ; Ha(je)iow, Maast. Kreideb. (nee Geinitz) ; Reuss ; 



MicJielin; Lamk. An. s. Vert. ii. ^^.olA; Rcemer; Heller; Grube; 



Menef/hini ; Busk. 

 Pustulipora, Blaiiw. I. c. p. 691 (index) ; Johnston, 2nd ed. p. 278; 



K Forbes ? ; Gray, List B. Rad. p. 14:3. 

 Tubulipora (pars), Couch. 

 Entalophora (pars), Lam.r. (1821), D'Orbiffiii/. 

 ? Ceriopora (pars), Gold/., Hagenoiv, if-c. 



1. Pustulopora delicatula, n. sp. 



Zoarium about half an inch high, usuallj' branched twice dichoto- 

 mously ; cells very long, rather more than half connate, rest free, 

 gently curved ; oocecium tumid. 



Hub. Australia, Cape Capricorn, 1.5 fathoms {Voy. Rattlesnake); 

 ? Madeira {J. Y. J.). 



