286 Architecture of Annelida (?) and Rhizopoda. 
cement-mortar, the mode of building reminding us of the 
careful dovetailing and fitting of the stones in a Cyclo- 
pean wall: of this mode of building, a Dzflugia (?) from 
Davis Strait affords a type. Or, 
4, The material may be so built as to present a tolerably even 
smooth surface, although the faces of the grains are still 
exposed, as in the “ Globigerine,” “ Nodosarine,” and 
“‘Orbuline Lituola,” figured by Carpenter ‘ Microscope,’ 
p- 533, fig. 273, a, b,c, g, h. Or, 
5. The sand-grains may be entirely plastered over and 
covered by the sarcode-cement, so that the surface is 
smooth and polished, like the face of a wall built of 
rubble imbedded in cement: of this, Cyclammina can- 
cellata, H. B. Brady, MS., and some other beautiful 
undescribed forms are examples. 
6. So with the employment of sponge-spicules. Nothing but 
fragments of large spicules may be employed: and these 
may be (A) laid longitudinally and cemented into a rough 
tube, or (B) they may be used only in one particular 
part of the structure, as in Marsipella elongata, Norman. 
5) 
7. Nothing but the smallest spicules may be used, and these 
incorporated with great exactitude in the walls, none of 
them projecting to the smallest degree, as in Technitella 
legumen, Norman, and an undescribed tube. Or, 
8. They may be projected at right angles to the surface, stand- 
ing out hedgehog-fashion from the wall, as in Pilulina 
Jeffreysti, Carpenter, and in some beautiful tubes in my 
collection. Or, 
9. A spicule may stand out here and there from a wall which 
is mainly built up of very finely comminuted material, 
as in Carpenter’s “ moniliform Ltuola” (1. c. fig. 271,f) 
and in another species in my collection. Or, 
10. A single large spicule may be employed to form an axis, 
on the middle of which a little sand ball is wrapped, so 
that it has the appearance of being spitted by the spicule, 
which projects many times the length of the ball on each 
side of it. 
11. The Globigerine shells, to the exclusion of every thing 
else, are built up into a form closely related to Lituola 
scorpturus (Montfort). 
C. Colour of Deep-sea Arenaceous Foraminifera. 
1. White: Technitella legumen, Norman, T. melo, Norman, 
or the Globigerina-building form just referred to. 
