196 BULLETIN OF THE 
usually describing a triangular, fan-like, or reniform figure, with more 
or less strongly arcuated edge, the whole reminding one of a Fadina 
alga of 0.5 to 2 mm. in thickness. Sometimes the shape is that of a 
biauriculated leaf, produced much more in breadth than in height. The 
edge is often undulated in broad folds, and sometimes new individuals 
sprout from the broad side, forming irregularly shaped clusters of two 
or three individuals. 
The chambers constitute arcuated, concentric, more or less complete 
bands, increasing in length with age, forming a fan-like growth, com- 
mencing with a pointed triangular juvenile stage. Some of the cham- 
bers do not extend from side to side, but stop short after a while, 
ending in an acute point on the broad side. 
The two ends of the chambers are usually produced in a narrow, more 
or less compressed, hollow appendage, with thin walls, composed of par- 
allel bundles of threads, which also are incrusted, but more sparingly, 
by sand and débris. The cluster-like appendages often divide into 
two or three terminal branches. The longest measure about 20 mm., 
with a diameter of 1 to 2 mm.; their wall is only 0.05—-0.06 mm. thick. 
Forming a row along the lower edge of the test, they serve prob- 
ably as fastenings to the bottom, where they often are entangled in 
masses of a Rhizammina. The chamber wall is thin, often wrinkled, 
and here and there pierced by irregularly formed pores of different size. 
In some places a faint striation running perpendicular to the chamber 
sutures across the chamber wall can be discovered, probably indicating 
the divisions into chamberlets. The interstice between the two side 
walls is crossed by numberless irregular partitions, forming masses of 
small chambers of different size and form, giving to the structure a 
sponge-like texture. The color is commonly sooty, with shades in dark 
olive ;; when dried, it becomes grayish clay-colored. 
The largest specimens measure about 190 mm. in breadth. On 
account of their brittleness, specimens in perfect condition are rarely 
obtained ; usually the early stage is detached and the border torn. The 
appendicular tubes are often wanting, or some scanty remnants only left. 
Among the whole assemblage of specimens from the ‘ Albatross” expe- 
dition, I have not found a single one with an embryo stage. 
Habitat. — Pacific: Lat. 1° 7’ N., Long. 8° 4! W. (about 35 miles 
W. N. W. off Galeras Point), in 3,097 meters’ depth (1,740 fathoms) ; 
olive-green ooze; temperature, +2°.2 Cent. (Albatross Exp. Stat. 
3,399.) 
