Nomenclature of the Forainiuifera. 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 Nummulina of 

 larger size than any of the foregoing (about ^ inch in dia* 

 meter) are abundant along the Australian coral-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; pL 5. figs. 23, 24). 

 This Viennese Nummulite D'Orbigny has referred to Fichtel 

 and Moll's Num. lenticular is, var. 8, but, we believe, erroneously, 

 as far as varietal relationship is concerned. The Australian 

 NummulincB just mentioned freely pass into Operculince, 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 ' Mono- 

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

 spread Operculina and Assilina, 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 Orbito!ites t 

 Alveolina, Polystomella, Milioke, Rotalia, &c., mostly of large 

 size. This fauna is strikingly a counterpart of the Calcaire 

 grossier. 



14. Nautilus Mamilla. Page 53 3 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 

 5J 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 ' Monographic 

 des Nummulites ' (contained in their ' Description des Animaux 

 Fossiles du Groupe Nummulitique de 1'Inde/ 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, pi. 6. figs. e-h. A small, smooth, thickly lenticular 



* MM. d'Archiac and Haime pass over this Nummulite, suggesting 

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

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

 metrical Amphistegina. 



8* 



