556 
THE VOYAGE OF H.M.S. CHALLENGER. 
externally, is portrayed in fig. 8. D’Orbigny’s figure ( Robulina ariminensis ) (loc. cit.) is 
taken from a comparatively thin shell, resembling Fichtel and Moll’s in having a carinate 
margin, and with the same sort of concentric ornament, but the sutures are depressed. 
All these appear to be individual modifications of the same specific form. 
Cristellaria costata has been taken at three Challenger Stations : — off Gomera, Canaries, 
620 fathoms; off Kandavu, Fiji, 210 fathoms; and off Raine Island, Torres Strait, 155 
fathoms. It is also reported from the shores of the Adriatic at Rimini and Lido. 
In the fossil condition it has been found in the later Tertiary clays of the neighbour- 
hood of Malaga (Parker and Jones) ; and if Robulina ariminensis be correctly assigned to 
the species, in the Miocene of the Vienna Basin (d’Orbigny). 
Ampliicoryne, Schlumberger. 
Marginulina, pars, Jones and Parker [I860]. 
Ampliicoryne, Schlumberger [1881]. 
The term Ampliicoryne has been proposed by Schlumberger (Comptes Rendus, 
Nov. 28th, 1881, p. 881) for a small group of dimorphous Foraminifera, of which the 
earlier segments are arranged after the manner of Cristellaria and the later ones in a 
straight line, like those of Nodosaria. In the majority of cases, specimens answering to 
this description are obviously nothing more than monstrosities, as for example that 
represented by PI. CXI II. fig. 13 ; but there are some varieties, notably the Mar- 
ginulina falx of Jones and Parker, that present tolerably constant characters, and if 
dimorphous structure is to be admitted as a basis of subdivision amongst the Nodosarince, 
there is no reason why this should not rank with Flabellina, Amphimorphina, and the 
rest, under a distinctive name. 
Ampliicoryne falx, Jones and Parker, sp. (PI. LXV. figs. 7-9). 
Marginulina falx, Jones and Parker, 1860, Quart. Journ. Geol. Soc., vol. xvi. p. 302, No. 28. 
Messrs. Jones and Parker (loc. cit.) describe this species in the following terms : — 
“ An elegant dimorphous, striated, little Nodosarina, with the first six or seven cells 
arranged in the form of a partially uncoiled trihedral Cristellaria (or Saracenaria of 
Defrance), and with the last two, three, or four chambers rectilinear and not distinguishable 
from those of Nodosaria longicauda , 1 with which this variety is always associated in 
nature. Nodosaria longicauda may be regarded as the normal form to which this variety 
belongs.” 
Ampliicoryne falx is not uncommon in the Mediterranean, at depths of less than 400 
fathoms ; it occurs also off the Cape of Good Hope, 150 fathoms ; on the western shores 
of New Zealand, 275 fathoms ; and off Raine Island, Torres Strait, 155 fathoms. 
1 Nodosaria longicauda, d’Orb, is now better knoAvn under its earlier name, Nodosaria scalaris, Batsch, sp. 
