458 
THE TOY AGE OF H.M.S. CHALLENGER. 
pyriform, and entosolenian — and the surface is beset with minute, rounded, exogenous heads, 
distributed without apparent order. 
Similar specimens are occasionally met with in the living condition, hut the finer 
examples, from deep water, are almost invariably ectosolenian, and possess a short wide 
external neck, as in figs. 8-11. In rare instances the bead-like ornament assumes more 
or less regular lines, as shown in fig. 11. Figure 12 represents a somewhat anomalous 
shell, of compressed and inequilateral contour, and with . both ento- and ecto-solenian 
apertures, the surface-ornament preserving the same general character as the rest. 
Assuming that the rough or sometimes apparently tuberculate surface of the Palaeozoic 
form, Lctgena parlceriana, is the natural condition of the test, and not brought about by 
age or by the nature of the matrix in which the specimens have so long lain embedded, 
there seems no reason why it should be kept distinct from the present species. 
Lagena aspera has been noticed at two Stations in the South Atlantic, at depths of 
675 fathoms and 1900 fathoms; at four in the South Pacific, 155 to 1375 fathoms; 
and at two in the North Pacific, 2050 fathoms and 2300 fathoms respectively. It has 
also been found in comparatively shallow water in the British seas. 
Even setting aside the Carboniferous specimens above alluded to, of which the condition 
of the exterior is perhaps somewhat ambiguous, the species is still one of the oldest known 
Lagence. It occurs in the Middle Lias, the Oolite, and the Chalk, and at intervals 
throughout the Tertiary and Post-tertiary periods. 
Lagena ampulla-distoma, Rymer Jones (PI. LVII. fig. 5). 
Lagena vulgaris, var. ampulla-clistoma, Ry. Jones, 1872, Trans. Linn. Soc. Lond., vol. xxx. 
p. 63, pi. xix. fig. 52. 
The following is Mr. F. W. Owen Rymer Jones’s description of this form. “The shell 
closely resembles some of the varieties of Lagena globosa, having the shape of a distended 
globe, the walls, however, being roughened by exogenous shell-deposit. From the anterior 
of the shell there projects an internal straight tube, passing three-fourths down the cavity, 
and terminating in a trumpet-shaped orifice ; at the centre of the base, however, there 
projects a short external tube in the same axial line as the internal one.” 
The specimen above described was from off Sandalwood Island, coast of Java, 1080 
fathoms ; that figured in PL LVII. from off Raine Island, Torres Strait, 155 fathoms. 
Lagena distoma- mar garitif era, Parker and Jones (PI. LVIII. fig. 16). 
Lagena distoma-mar garitif era, Parker and Jones, 1865, Phil. Trans., vol. civ. p. 357, pL xviii. 
fig. 6, a.b. 
„ synedra, Giimbel, 1868, Ahh. d. k. bayer. Akad. Wiss., IT. Cl., vol. x. p. 608, fig. 10, a.b. 
This variety is described by Parker and Jones as “ a large two-mouthed Lagena, 
never quite straight, richly ornamented with pearl-like grains, profusely spread over the 
