302 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
tracum; suture very deep but not channelled, the whorl in front of it, for a 
small space, free from spiral sculpture ; beyond this the sculpture consists of fine 
close-set spiral threads, of which some are a little larger than the rest, having 
from one to three of the smaller ones intercalated between them ; there are about 
six of the larger ones between the sutures on the penultimate whorl; on the 
earliest remaining whorl there are six similar squarish threads with narrower 
channelled interspaces, and these are regularly reticulated by fine equidistant 
vertical elevated lines; on the later whorls there are only incremental lines of 
no great strength; base of the last whorl rather contracted ; aperture ample, the 
outer lip thin, simple; a faint wash of callus on the inner lip; pillar slender, 
twisted, with a distinctly marginated edge and pervious axis; canal moderately 
long and wide, twisted and slightly recurved. Length of four whorls, 21; of 
last whorl, 14; max. diam. 8.5 mm. 
U.S. 8S. “Albatross,” station 3398, off the coast of Ecuador, in 1573 fathoms, 
ooze, bottom temperature 36° F. U.S. N. Mus. 123,007. 
This is a very characteristic abyssal species and does not closely resemble any 
of those heretofore described. 
Exilim Conran. 
Exilia Conrad, Journ. Acad. Nat. Sci. Phila., 1860, n. s., 4, p. 291, pl. 47, fig. 34; 
type E. pergracilis Conrad, |. c. Not Exilia Mulsant, 1863. 
This shell was described from the Hocene of Alabama by Conrad, and appears 
to differ from Fusinus chiefly by its small size, delicate sculpture, and slender 
form. It has been stated to have a plicate pillar, but this is perhaps due to con- 
fusion with a species belonging to another genus, since the undoubtedly authentic 
specimens in the National Collection show not the slightest trace of any plication. 
The following species recalls Exilia in many particulars and might perhaps be 
appropriately referred to this subgenus. 
Fusinus (Bxilia?) rufocaudatus Datu. 
Plate 3, figure 3. 
Fusus rufocaudatus Dall, Proc. U. S. Nat. Mus., 1896, 18, p. 12. 
Shell elongate, acute, thin, with six or more whorls (partly eroded) covered 
with a delicate yellow-brown epidermis, the pillar and canal, when fresh, of 
a pronounced rufous-brown or brown-pink, which fades more or less in the dry 
shell; whorls drawn out, rounded, with a deep but not channelled suture; 
nucleus eroded; the remaining whorls sculptured with about a dozen flattened 
subequal spirals with narrower grooves between them, crossed by lines of growth 
and (on the last whorl about twenty) sharp flexuous riblets, which cross the whorl 
and are obsolete on the canal; base attenuated ; pillar long, very straight, attenu- 
