456 
THE VOYAGE OF H.M.S. CHALLENGER. 
Yorkshire (Blake), in the Middle Lias of Essey-les-Nancy, France (Terquem and Berthelin), 
in the Oolite of Switzerland and France, and thenceforward in marine deposits of almost 
every period down to recent times. 
Lagena clavcita, d’Orbigny, sp. 
Oolina clavata, d’Orbigny, 1846, For. Foss. Vien., p. 24, pi. i. figs. 2, 3. 
A modification of Lagena Icevis, distinguished by the fusiform contour of the body 
of the shell and its pointed base. A figure of this variety has been accidentally omitted 
from the plates. 
The distribution of Lagena clavata, whether geographical or geological, is probably 
nearly coextensive with that of Lagena Icevis, though in point of number the specimens 
are much less abundant than those of the type. 
Lagena gracillima, Seguenza, sp. (PI. LYI. figs. 19-28). 
“Testae Ova'les, fusiformes,” & c., Soldani, 1798, Testaceograpliia, vol. ii. p. 37, pi. xii. fig. Q. 
Miliola Icevis (pars), Ehrenberg, 1845, Mikrogeologie, pi. xxvi. fig. 2. 
Amphorina gradlis, Costa, 1856, Atti dell’ Accad. Pont., p. 121, pi. xi. fig. 11. 
„ gracillima, Seguenza, 1862, Foram. Monotal. Mess., p. 51, pi. i. fig. 37. 
55 
acuminata, 
Id. 
Ibid. 
p. 51, pi. i. fig. 35. 
55 
cylindracea, 
Id. 
Ibid. 
p. 51, pi. i. fig. 36. 
55 
distorta, 
Id. 
Ibid. 
p. 52, pL i. fig. 38. 
Lagena sulcata, var. clistoma-polita, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 357, 
pi. xiii. fig. 21 ; pi. xviii. fig. 8. 
„ gracillima, Jones, Parker, and Brady, 1866, Monogr. Foram. Crag, p. 45, pi. i. 
figs. 36, 37. 
The test of Lagena gracillima is long and slender, broadest near the middle, and 
drawn out to a fine point at the extremities, each of which carries an aperture. Seguenza’s 
name, under which the variety is generally known, has been retained, as the antecedent 
term “gracilis,” employed by Costa, has become associated with a somewhat different 
form. 
In the living condition Lagena gracillima is a very common Foraminifer, occurring in 
almost every latitude, and at depths ranging from estuarine shallows to the mid-ocean 
bed at 2300 fathoms. 
It is found as a fossil in the Miocene and Pliocene of Sicily and Southern Italy 
(Seguenza), in the Crag of the east of England (Jones, Parker, and Brady) ; and in the 
Post-tertiary deposits of Norway (Crosskey and Robertson), of the west of Scotland 
(Robertson), and of the north-east of Ireland (Wright). 
