BALL: MOLLUSCA AND BKACHIOPODA. 301 



ovate, with an aj)ical acute 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. 22 mm. 



U. S. S. "Albatross," station 3355, Gulf of Panama, in 182 fathoms, mud, 

 bottom temperature 54°. 1 Y. 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 Bruguiere, Encycl. Mdth., 1789, p. 15 (nude name; not Fusus Helbling 



1779) ; Lamarck Prodrome, p. 73, 1799 ; type Murex colus Linn^. 

 Fusinus Dall, U. S. Geol. Survey, Professional Papers. 



Fusinus panamensis Dall, n. sp. 



Shell solid, white, covered with an olivaceous pcriostracum 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 Avith 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 oue formed with some dis- 

 tortion) ; operculum elongate, oval, with apical nucleus. Lengtii of five whorls, 

 75; of last whorl, 55 ; of aperture without tiie canal, 21 ; max. diam. 26 mm. 



U. S. S. "Albatross," station 3391, Gulf of Panama, in 153 fathoms, mud, 

 bottom temperature 55°.8 F. U. S. N. Mus. 123,004. 



A rather rude but very distinct species. 



Fusinus fragillissimua Dall, n. ep. 



Plate 12, figure 0. 



Shell small, excessively thin and fragile with (more than) four rapidly enlarg- 

 ing whorls ; shell substance chalky, yellowish white, with a pale olivaceous perios- 



