Nomenclature of the Foramiuitcra. 107 



(dredged by Dr. P. C. Sutherland, at 25 to 30 fathoms) of the 

 same type as the above, presenting sinuous radial lines of the 

 same pattern as those in N. radiata. Recent Nummulime of 

 larger size than any of the foregoing (about j inch in dia- 

 meter) are abundant along the Australian coi"al-reefs at from 

 10 to 20 fathoms, as shown by dredgings brought from Australia 

 by Mr. Jukes. These show radiating septal lines of a similar 

 sigmoidal pattern, and thus closely resemble D'Orbigny^s Num- 

 mulina radiata* (For. Foss. Vien. p. 115, pi. 5. tigs. 23, 24). 

 This Viennese Nummulite D'Orbigny has referred to Fichtel 

 and MolFs Num. lenticularis, var. 8, but, we believe, erroneously, 

 as far as varietal relationship is concerned. The Australian 

 Nummulirus just mentioned freely pass into OpcrculincB, of a 

 rather larger growth, by the gradual loss of the triangular over- 

 lying flaps of sarcode, — gradations being thus made between 

 such a form as that above quoted from Williamson's ' j\lono- 

 graph,' through innumerable and gentle stages, into flat out- 

 spread OperculiiuE and Assilma, exposing their bare whorls. In 

 these Australian dredgings the individuals are excessively nu- 

 merous, in an almost purely calcareous mud, constituting in some 

 instances upwards of fifty per cent, of the deposit. These 

 Foraminifers are accompanied by a great variety of Orbitolites, 

 AlveoUncB, PolystomellcB, Miliolae, Rotalue, &c., mostly of large 

 size. This fauna is strikingly a counterpart of the Calcaire 

 grossier. 



14. Nautilus Mamilla. Page 53, pi. 6. figs. a-d. " Fossil : 

 Brunn near Steinfeld, Neusiedler See, Margareth, Maria Loretto, 

 Kroisbach, and other places in Lower Austria and on the con- 

 fines of Hungary." 



A smooth lenticular Nummulite (1| line in diameter), with 

 thin edges and a raised umbonal centre on each face. In fig. c 

 5 1 whorls are shown, with 24 oblique chambers in the outer 

 whorl ; the central cell is small. 



Vicomte d'Archiac and M. J. Haime, in their ' Monographie 

 des Nummulites ' (contained in their ' Description des Animaux 

 Fossiles du Groupe Nummulitique de Tlnde,' 4to, Paris, 1853), 

 express an opinion that " Nautilus Mamilla " is probably Num- 

 mulina Ramondi, Defr., var. d (Monogr. p. 129, pi. 7. figs. 13- 

 17) : this may be, though the evidence is not very clear. 



15. Nautilus lenticularis. Five varieties; p. 55. "Fossil: 

 Klausenberg in Transylvania. 



Var. a, jil. G. figs. e-h. A small, smooth, thickly lenticular 



* MM. (I'.Vicbiac and Haime ])ass over this Nummulite, suggesting 

 that it may be au Amjjfdsteyina (Monogr. p. 160). It is, however, a true 

 Nummulite in all its charaeters. We do not know of any bilaterally sym- 

 metrical Amphistegina. 



8* 



