CLASS II 



TUBULARIAE 



121 



exterior, and composed of rather thick, concentric, calcareous lamellae. Inter- 

 laminar spaces divided into chamberlets by stout radial pillars, which usually 

 extend continuously through a number of lamellae. Both lamellae and pillars 

 consist of minutely tabulated tissue, the tubules of which are radial in arrange- 

 ment. Centre frequently occupied by a foreign body. Cambridge Greensand 

 (Cenomanian). 



The genera ParJceria and Loftusia were originally described as agglutinated 

 Foraminifera ; they are, however, manifestly very closely allied to Ellvpsactinia 

 and Sphaer actinia. 



Porosphaera Steinm. (Fig. 188). Globular masses of the size of peas or 

 hazel-nuts frequently growing around some foreign body, and composed of 

 anastomosing calcareous fibres which are penetrated by 

 numerous radial tubules ; the latter open on the surface 

 in the form of large pores, around which radial or stel- 

 late furrows (astrorhizae) are sometimes grouped. Upper 

 Cretaceous. 



A B 



1S7. 



Fig. 188. 



Poros2}haera (jlohidaris 

 (Pliill.). Upper Cretace- 

 ous ; Rligeu. .-1, Skeleton, 

 natural size ; /, Cavity 

 originally occupied by 

 foreign body. B, Trans- 

 verse section showing 



Loftusia j^erKiiu Brady. Eocene ; Persia. A, Specimen cut open to show general radial tubes of gastro- 

 structure, natural size (after Brady). B, Section showingitwo lamellae and inter- pores, "/i (after Stein- 

 laminar tilling, greatly enlarged. niann). 



Sfolicz'karia Duncan. Trias ; Karakoram and Balkan Mountains. 



Cycloporidium, EJiizoporidium Parona. Ci-etaceous. Foradinia and Cydac- 

 tinia (Kerunia Mayer-Eymar) Vinassa. Tertiary. 



Heterastridium Reuss (Syringosphaeria Duncan). Includes spheroidal, nodular 

 bodies of considerable size, composed of slender, anastomosing, and more or 

 less distinctly radial calcareous fibres. Skeleton comparatively dense, but 

 perforated by two series of zooidal tubes appearing superficially as pores. The 

 apertures of the larger tubes are round, those of the smaller stellate, and are 

 surrounded by radial furrows. Alpine Trias. 



Appendix to the Hydrocorallinae and Tubulariae. 



Stromatoporoidea Nicholson and Murie.' 



Closely allied to the Hydrocorallinae and Hydractinia are the extinct Stromaio- 

 poroidea, which combine in many respects the characters pertaining to both of 



1 Bargatzki, A., Die Stromatoporen des rlieinischen Devons. Bonn, 1881. — Nicholson, H. A., 

 Monograph of the British Stromatoporoids. Palaeont. Soc. 1886-92.— 6?i:r<2/, G. 11., Revision of 

 the Sponges and- Coelenterates of the Lower Helderberg Group of New York. 14th Ann. Rept. N.Y. 

 State GeoL, 1894. — Toniquist, A., Uber mesozoisclie Stromatoporiden. Sitzber. preuss. Akad. 

 Wiss., 1901, vol. xlvii. — Yabe, 11. , On a Mesozoic Stromatopora. Journ. Geol. Soc. Tokj'O, 1903, 

 vol. X. — Deningev, K., Einige neue Tabulaten nnd Hydrozoen aus niesozoischen Ablagerungen. 

 Neues Jahrb. f. Mineral, i., 1906.— Bofhpletz, A., Uber Algen nnd Hydrozoen im Silur von 



