DALL: MOLLUSCA AND BRACHIOPODA. 301 
ovate, with an apical acuto nucleus, the area of adhesion quite small in proportion 
to the surface. Length of shell, 38 ; of last whorl, 29; of aperture, 22 mm. ; max. 
diam. 29 mm. 
U. S. S, “ Albatross,” station 3355, Gulf of Panama, in 182 fathoms, mud, 
bottom temperature 54°.1 F. U, S. N. Mus. 123,003. 
This is perhaps the handsomest and most regularly sculptured species of this 
group, 
FUSINUS RAFINESQUE. 
Fusinus Rafinesque, Anal. de la Nature, 1815, p. 145; new name for Fusus Lamarck, 
preoccupied, 
Fusus Bruguière, Encycl. Méth., 1789, p. 15 (nude name; not Fusus Helbling 
1779); Lamarck Prodrome, p. 73, 1799; type Murex colus Linné. 
Fusinus Dall, U. S. Geol. Survey, Professional Papers. 
Fusinus panamensis DAL, n. sp. 
Shell solid, white, covered with an olivaceous periostracum and about eight 
whorls (two or three at the apex defective in the specimen) ; axial sculpture of (on 
the apical whorls six, on the last whorl nine or ten) prominent rounded ribs with 
about equal interspaces ; on the apical whorls these cross the whorl from suture 
to suture, but later become gradually more confined to the periphery, and on the 
last, whorl show signs of obsolescence; these are crossed by numerous fine, sharp 
threads, slightly turgid where they cross the ribs, and with wider interspaces ; the 
Peripheral thread becomes more prominent, and on the last whorl or two almost 
becomes a keel from which the whorl slopes back to the suture in a flattish 
manner; the suture is distinctly appressed, not deep except near the apex; aper- 
ture rounded, white; the outer lip simple, not reflected, with a few spiral lirae 
in the throat which fall short of reaching the lip; inner lip with a thin callus with 
the edge raised anteriorly and faint indications of liration; canal constricted, 
long (in the specimen it has been broken and a new one formed with some dis- 
tortion); operculum elongate, oval, with apical nucleus. Length of five whorls, 
75; of last whorl, 55; of aperture without the canal, 21; max. diam, 26 mm. 
U.S. S. “ Albatross,” station 3391, Gulf of Panama, in 153 fathoms, mud, 
bottom temperature 559.8 Y, U. S. N. Mus, 193,004. 
A rather rude but very distinct species. 
Fusinus fragillissimus Dat, n. sp. 
Plate 12, figure 6. 
Shell small, excessively thin and fragile with (more than) four rapidly enlarg- 
ng whorls; shell substance chalky, yellowish white, with a pale olivaceous perios- 
