398 
ME. W. K. PAEKEE AND PEOFESSOE T. E. JONES ON SOME 
Sp. vivipara is rare anywhere, and always small. We have it in the mixed sands from 
Norway (MacAndrew and Barrett), and from 60 to 70 fathoms, Hunde Islands (Dr. 
Sutherland) ; in deep water it is represented by the better developed Sp. margaritifera, 
Williamson. 
Genus Patellina. 
Patellina corrugata, Williamson. Plate XV. fig. 29 a, 29 b, 29 c (Arctic). 
This species has been well figured and described by Professor Williamson (Monogr. 
p. 46, pi. 3. figs. 86-89); see also Carpenter’s Introd. Foram. p. 230. 
We have P. corrugata from the Hunde Islands (Dr. Sutherland’s dredgings), at from 
30 to 70 fathoms; where it is common and small throughout. Professor Williamson 
had it from the same source, and found it in several sands on the British coasts. It is 
present in most sea-beds that are rich with Foraminifera, from the littoral zone down to 
500 fathoms ; but is rarely in great abundance. 
Genus Nummulina. 
Nummulina perforata, Montfort, sp., Yar. planulata, Lamarck. Plate XIV. figs. 45 a, 
45 b (Arctic). 
From the Bed Sea Fichtel and Moll got two little Nummulina very similar to the 
specimens before us; Professor Williamson also has similar specimens from the British 
coast; and in Mr. Jukes’s Australian dredgings Nummulina of like character abound, 
but larger, and passing into Operculina. These are degenerate forms of Nummulina 
planulata , once so abundant in the Eocene (or Nummulitic) Tertiary period, and exist- 
ing still later in, at least, the Vienna area (Middle Tertiaries). N. planulata itself is a 
simple form of the better-developed N. perforata, Montfort, which in its extreme growth 
became N. nummularia , Brug. (N. complanata, Lam.). 
This small form of N. planulata (subvar. radiata, Fichtel & Moll.) is -rather common 
at the Hunde Islands in 25 to 30 fathoms. See also Ann. Nat. Hist. ser. 3. vol. v. 
pp. 105-107. 
Besides the above-mentioned localities, the Abrolhos Bank in the South Atlantic and 
Bombay Harbour are places where N. planulata has been found. 
Nummulina perforata, Montfi, sp., Var. ( Operculina ) ammonoides, Gronovius, sp. 
Plate XIV. figs. 44 a, 44 b (Arctic) ; Plate XVII. figs. 62, 63 (North Atlantic). 
This is the diminutive and northern representative of the much larger Operculina 
complanata, Defrance, sp., which is a varietal form of Nummulina. The last (Nummu- 
lina) is but poorly represented now-a-days (as far as our knowledge goes) ; but Oper- 
culina is sometimes almost, if not quite, as large in the Australian, New Zealand, and 
Philippine seas as ever it was in the Cretaceous, Eocene, and Miocene times. See Ann. 
Nat. Hist. 3 ser. vol. viii. p. 220, &c. Dr. Carpenter has specially studied the structure 
of Operculina, Phil. Trans. 1859 ; and Introd. Foram. p. 247, &c. pi. 11. 
