18 AKT. 6. K. B. NEWTON AND E. HOLLAND : 



Cumidipora Rosenbergi, M aktin : Samml. Geol. Reichs- Mus. 

 Leiden, 1881. Vol. I, Part I, pp. 12-14, 64, PI. III, 

 fig. 7. 



Lithothamnium Rosenbergi, M aktin : Samml. Geol. Reichs- 

 Mus. Leiden, 1881. Vol. I, Part II, pp. 70, 79 ; and 

 ibid., 1882. Vol. I, Part III, pp. 153, 155. 



Lithothamnium ramosissimum , Rothpletz : Zeilscli. Deutsch. 

 Geol. Ges., 1891. Vol. XLIII, p. 320. 



Lithothamnium ramosissimum, K. Nishiwada : Journ. College 

 Sei. Imp. Univ. Tokyo, 1894. Vol. VII, Part III, p. 

 233, PI. XXIX, figs. 1-3. 



Lithothamnium {Cumidipora) Rosenbergi, Newton and Hol- 

 land : Journ. Geol. Soc. Tokyo, 1900. Vol. VII, No. 

 81, p. 1. 



Lithothamnium Rosenbergi, S. Yoshiwaka : Journ. Geol. 

 Soc. Tokyo, 1900. Vol. VII, No. 81, p. 22. 



Besides the organisms already referred to as occurring in 

 the Orbitoidal-limestones of the Riü-Kiü Islands we have to add 

 that of the well-known Nullipore. 



Lithothamnium ramosissimum. Our illustration (PI. I, fig. 

 8) exhibits a vertical section ( x 70) of one of the branches made 

 up of the innumerable rectangular cells and arranged in the 

 usual concentric layers. Among fossil Calcareous Algae this species 

 is of considerable importance as a reef-building organism. At 

 Leitha near Vienna it enters largely into the structure of the 

 so-called " Leithakalke," a limestone belonging to the Middle 

 Miocene and which according to Prof. de Lappakext 1 may be 

 included in the Tortonian division of that formation. It is of 



1. Traité de Géologie, 1000, VA. 4, p 1547. 



