LAGENIDA. 43 
exist ; for we find that in any of the subspecific groups forms may occur having either a 
gently tapering neck (Ectosolenian), or a tube abruptly set in (Ento-ecto-solenian), or a 
mouth-tube entirely intussuscepted (Entosolenian). Z. marginata is sometimes distoma- 
tous, being open at the base, and then coming under another (artificial) subdivision. 
No division of the species can be made depending on the general form of the shell; 
from nearly globose to the most compressed and carinate specimen every gradation of 
contour may be shown. 
The distribution of Zagena marginata is world-wide. Professor Williamson has 
recorded its occurrence at 100 fathoms at the Hunde Islands (‘ Monogr.,’ pp. 10, 11); 
and we have found it in Dr. Sutherland’s dredgings from the same locality (30 to 70 
fathoms), as well as in Messrs. MacAndrew and Barrett’s material brought from Drontheim, 
North Cape (30 to 200 fathoms). On our own shores it iscommon everywhere. For some 
of its Mediterranean habitats (recent and fossil) see ‘ Quart. Journ. Geol. Soc.,’ vol. xvi, 
p- 302, Table. Under the name of Oolina compressa, D’Orbigny described it as occurring 
with other ZLayene at the Falkland Isles. It is figured by J. D. Macdonald, Assist. 
Surgeon H. M.S. Herald, in the ‘ Annals Nat. Hist.,’ 2nd ser., vol. xx, pl. 5, figs. 7—19, 
but not described. He found it, together with Uvigerina dimorpha, Spiroloculina planata, 
Quingueloculina seminulum, and Triloculina oblonga, in 400 fathoms water, between 
Ngaa and Viti-Laru, in the Fiji group of islands. We have seen specimens hexagonally 
areolated, like Z. squamosa, but less distinctly so, from the Tertiary beds of San 
Domingo, and from the white mud of the Australian Coral-reefs (Z. sguamoso-marginata, 
P. and J.). 
Large specimens of Z. margimata are not uncommon in the Crag with Cyprina 
Islandica ; and, less finely grown, it is frequent in the Gedgrave bed with Cardita 
senilis. 
9. Lacena ornata, Williamson. Plate I, figs. 29—31. 
ENTOSOLENIA MARGINATA, var. ORNATA, Williamson, 1858. Rec. For. Brit., p. 11, 
pl. 1, fig. 24. 
— — var. LAGENOIDES, Id. Ib., figs. 25, 26. 
LAGENA LAGENOIDES, Reuss, 1862. Sitz. Akad. Wien., xlvi, p. 324, pl. 2, figs. 27, 28. 
FIssURINA TRAPEZOIDEA, Seguenza, 1862. Foram. Monot. Mioc. Mess., p. 68, pl. 2, 
fig. 34. 
— REUSSIANA, Id. Ib., p. 69, pl. 2, fig. 40. 
— RADIATA, Id. Ib., p. 70, pl. 2, figs. 42, 43. 
Characters.—Flask-shaped, with or without neck; either Ento- or Hcto-solenian, or 
both, more or less compressed, and having its margin produced to a variable extent, and 
