714 
Proceedings of the Royal Society 
sures more than an inch in diameter (1*2 inch or 31 mm.); 
a second, somewhat thicker proportionately, measures 45 inch, 
or nearly 12 mm. Both of these have a surface ornament of 
fine, raised, closely-set striae, parallel to the direction of growth, 
not absolutely straight and continuous, but taking a slightly 
waved and irregular course. 
Cornuspira involvens , Beuss. — The specimens from both localities 
are somewhat doubtful ; they have fewer convolutions than usual, 
and it is just possible they may be the tubes of minute annelids. 
Cornuspira crassisepta , nov. — Convolutions very narrow and nume- 
rous, especially near the centre, as in C. involvens ; but the 
peripheral edge is nearly square instead of rounded, and the 
spiral septal wall is thick, and marked externally by a raised 
limbate line. Diameter inch, or 0*56 mm. 
This is the isomorph in the porcellanous series, of a somewhat 
rare perforate form, Spirillina limbata. 
Rhabdammina cornuta , Brady. — This is the species previously 
described under the name Astrorhiza cornuta [Quart. Jour. Micr. 
ScL, vol. xix. n.s. p. 43, pi. iv. figs. 14, 15), but the structure of 
the test accords better with the firmly-cemented shell of Rhab- 
dammina than with the thick, loose, sandy investment of Astrorhiza , 
and its position has been changed accordingly. 
Jaculella obtusa, nov. — Test long, cylindrical, nearly straight, con- 
sisting of a tapering tube, commencing in a small bulbous 
chamber, and gradually increasing in size to the opposite 
extremity, which is broad and open. Texture coarsely arena- 
ceous, hard and firmly cemented ; exterior rough. Length, 
inch, or 8’0 mm. 
It is possible that this may be only a variety of Jaculella acuta , 
from which it differs chiefly in having a small inflated primordial 
chamber instead of terminating in a point, and in its generally more 
slender contour. Of all arenaceous Foraminifera Jaculella appears 
to have the hardest and most firmly cemented test ; at any rate, it 
is the one of which it is most difficult to obtain a satisfactory 
section by ordinary methods. 
Marsipella cylindrical nov. — Amongst the Arenacea found in the 
material from D., are a number of delicate cylindrical tubes, of 
