364 
ME. W. K. PAEKEE AND PEOEESSOE T. E. JONES ON SOME 
(still retaining the same kind of aperture), and with or without the intervention of a 
biserial arrangement of chambers. This dimorphism of the Uvigerine type is seen best, 
however, in specimens from shell-beds in the tropical and subtropical parts of the Indian 
and Atlantic Ocean ; but in these the triserial mode of growth is obsolete, and even the 
biserial is but feebly developed ; the result being a shell which, at first sight, might 
easily be mistaken for a Nodosaria Raphanus. Close examination, however, shows the 
short, wide, strongly labiate aperture of TJvigerina , markedly developed, and a plaiting of 
the early chambers*. D’Orbigxy has figured, under the name of Sagrina gmlchella, 
Foram. Cuba, pi. 1, figs. 23, 24, a specimen which was either the young, or an arrested 
individual of such a biformed TJvigerina. Bigenerina amongst the Textulariae is the 
isomorph of the above described dimorphous TJvigerina {Sagrina). 
Not only is our Nodosariform TJvigerina connected with the typical TJ. jpygmcea (figs. 
53-56) through Sagrina imlchella, D’Orb., but an intermediate condition between it and 
the feebler dimorphs of the Mediterranean area occurs in the mud brought up by the 
sounding-lead from the Abrohlos Bank {TJ. dimorpha). 
Altogether, this latter group of forms shows how great the affinity is between the 
always hyaline TJvigerina and the porous sandy Textularia.. 
The specimens figured in Plate XIII. figs. 53-57 are very common forms. The finest 
individuals (figs. 53, 54) are from the mixed sands of the Norwegian coast. The feebler 
specimens (figs. 55-57) are common in shell-sands from 30-70 fathoms at the Hunde 
Islands, Davis Straits. 
In the North Atlantic TJvigerina jgygmcea (Plate XVII. fig. 65) is large and common 
throughout the eastern marginal plateau : wanting at great depths ; rare and middle- 
sized north of the Bank ; and rather common and of middle size in Trinity Bay. 
TJvigerina jpygmcea is world-wide in its distribution, and goes back at least to the 
Middle Tertiary period. 
TJvigerina jpygmcea, D’Orb., Var. angulosa , Williamson. Plate XIII. fig. 58 (Arctic); 
Plate XVII. figs. 66 a, 66 b (North Atlantic). 
Of this we have spoken above, page 363. This compressed condition turns up wherever 
TJvigerince are at all common ; the ribbed or striated forms belonging to moderate depths. 
In the mixed sands from Norway specimens were rather common. 
In the North Atlantic TJ. angulosa is rare and small ; it occurs on the eastern marginal 
plateau to the north of the Bank, and in Trinity Bay ; but was not found in the Abyssal 
area. 
Genus Orbulina. 
Orbulina universa, D’Orbigny. Plate XYI. figs. 13, 14 (North Atlantic). 
This is a monothalamous hyaline Foraminifer, globular and porous, of world-wide dis- 
* A ribbed form fromtbe East Indian Seas is onr TJvigerina ( Sagrina ) RapTianus, Plate XYIII. figs. 16, 17 ; 
and a smooth one from the Abrohlos Bank is our TJ. (/S'.) dimorpha, Plate XYIII. fig. 18. 
