302 bulletin: museum of comparative zoology. 



tracum ; suture very deep but not chaunelled, 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 

 chaunelled 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 margiuated edge and pervious axis; canal moderately 

 long and wide, twisted and slightly recurved. Leugtli of four whorls, 21 ; of 

 last whorl, 14 ; max. diam. 8.5 mm. 



U. S. S. "Albatross," station 339S, off the coast of Ecuador, in 1573 fathoms, 

 ooze, bottom temperature 36° F. U. S. N. Mas. 123,007. 



This is a very characteristic abyssal species and does not closely resemble any 

 of those heretofore described. 



Exilia Conrad. 



Exilia Conrad, Journ. Acad. Nat. Sci. Phila., 1860, n. 8., 4, p. 291, pi. 47, fig. 34; 

 type E. pergracilis Conrad, 1. c. Not Exilia Mulsant, 1863. 



This shell was described from the Eocene of Alabama by Conrad, and appears 

 to differ from Fusiuus 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 witli a species belonging to another genus, since the undoubtedly authentic 

 specimens in the National Collection show not tlie slightest trace of any plication. 

 The following species recalls Exilia in many particulars and might perhaps be 

 appropriately referred to this subgenus. 



Fusinus (Exilia?) rufocaudatus Dall. 



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 browu-pink, which fades more or less in the dry 

 slicll; whorls drawn out, rounded, with a deep but not clianncllcd suture; 

 nucleus eroded; the remaining whorls sculptured with about a dozen flattened 

 subcqual spirals with narrower grooves between them, crossed by lines of growth 

 and (on the last whorl about twenty) sharp floxuous riblcts, which cross the whorl 

 and arc obsolete on the caual ; base attenuated ; pillar long, very straight, attcuu- 



