952 THE ATLANTIC. [cnar. ry. 
ary septa are continued downward along the middle of these 
costal ridges for about one-third the height of the wall of the 
calicle. The costee of the third and fourth order are present as 
much smaller ridges separated by fine vertical grooves. The 
whole surface of the wall of the calicle is scattered over with 
small pointed granulations. 
The arrangement of the septa is irregular. In the two small- 
er specimens there are six systems and four cycles. In the 
three larger specimens, in several of the large inter-septal spaces 
included between the primary and secondary septa, two septa 
are developed in addition to the usual three; there is thus a 
tendency in this species to form a fifth cycle of septa. The 
septa are complete, with the exception of those of the fourth 
and the partial fifth cycles. The primary and secondary septa 
are very prominently exsert, projecting vertically above the 
margin of the wall of the calicle 4 mm. Their edges are 
rounded, and they slope gradually down to the point where the 
pali take origin. The septa of the third and fourth orders are 
also exsert, but to a much less degree. 
The primary, secondary, and tertiary septa are provided with 
pali, which form three circlets. The pali are very conspicu- 
ous and prominent, those of the third cycle being, as usual, the 
largest, and projecting to a height of 4 mm. above the level of 
the summit of the columella, while those of the primary cycle 
do not project more than 15 mm. The pali of the secondary 
septa are placed at a slightly greater distance from the centre 
of the columella than those of the primary; the pali thus form 
three rings or crowns. 
The whole of the septa and pali are formed of thin but 
strong laminee slightly thickened at the line of origin from the 
ealicle, and terminating superiorly in sharp knife-edged mar- 
gins. 
The surfaces of the septa and pali are covered with very 
small granular projections, which, in the primary and secondary 
