590 
DE. CAEPEjS-TEE’S EESEAECHES ox the EOEA^nXITEEA. 
Fig. 4. Disk of Philippine variety, as seen on its gi'owing side, with the origins of 
the spines ; the last half whorl is here apparent, the newest chambers having 
only their own proper walls, whilst those which preceded them are more and 
more overgrown by the ‘intermediate skeleton,’ in which they gradually 
become imbedded ; the surface of the disk shows the usual punctation, with 
an average development of tubercles ; that of the spines is fuiTOwed. [Magni- 
fied 25 diameters. 
Figs. 6, 6, 7. Young Calcarinoe, showing their ordinary aspect. Magnified 20 dia- 
meters. 
Figs. 8, 9. Hispid varieties of Philippine Calcarince (see also Plate XX. fig. 6). Mag- 
nified 30 diameters. 
Figs. 10, 11. Portions of figs. 8 and 9 more highly magnified: in fig. 10 it is seen that 
the spines are tubular, being formed around the pseudopodia as they issue 
from the passages in the shell. Magnified 60 diameters. 
Fig. 12. Ideal representation of Calcarina \q.\^ open; showing the unsymmetrical or 
‘ turbinoid ’ disposition of the spire (its apex being placed downwards for 
more convenient display) ; the Eotaline aspect of the last-formed chambers, 
and the row of pores along the inner margin of the septal plane, which con- 
stitutes the only aperture of the last chamber ; the maimer in which each 
turn of the spire is overgrown by the exogenous deposit fonning the ‘ inter- 
mediate ’ or ‘ supplemental skeleton ’ which fills up the whole interior of 
the cone, and conceals all but the last-formed portion of the spire ; the 
penetration of this ‘supplemental skeleton’ by canals, which originate on the 
outside of the proper walls of the chambers, and pass in a somewhat radiating 
direction towards both surfaces of the disk, separated at intervals by non- 
canaliferous cones, whose bases appear externally as elevated tubercles ; the 
connexion of the spines Avith the ‘ supplemental skeleton,’ from Avhich the 
older spines recewe neiv investments at ei’ery turn of the spire ; and the 
extension of the canal-system into the spines, on the furrowed depressions of 
whose surface it opens at numerous points. 
PLATE XX. 
All the figures in this Plate refer to Calcarina Sjjengleri. 
Fig. 1. Section of the disk taken through the axis of the spire: «, a®, «*, successAe 
whorls transversely dAided ; Z>, the proper AA'all of the last-formed chamber, 
not yet consolidated by exogenous deposit ; c, row of pores at the inner edge 
of the septal plane, constituting the only communications betAA’een the 
chambers ; d, d, canals passing through the supplemental skeleton to the 
surface of the disk ; e, e, non-canaliferous portions of the supplemental 
skeleton. Magnified 50 diameters. 
