FUSUS LONGIROSTER. 173 



differ from anything else known to me from the Crag deposits, and nray be referred, 

 I think, to the species named, which seems confined at present to Siberia and the 

 Pacific coasts of North America ; were it not, however, that so many of our 

 Pliocene North Sea mollusca are closely related to those now living in the North 

 Pacific, the present shell might have been regarded, perhaps, as an abnormal 

 variety of N. antiqiia. 



Neptunea ignota, sp. nov. Plate XXIV, fig. 16. 



Specific Characters. — Shell ovato-fusiform, coarse, thick and strong; whorls 

 convex, the last five-sixths the total length ; ornamented by rather strong spiral 

 ribs with finer ones in the interspaces, and by numerous rough, close-set lines of 

 growth; suture deep; mouth oval, angulate above; outer lip regularly curved, 

 not expanded, ending in a very short, wide and open canal. 



Dimensions. — L. 68 mm. B. 34 mm. 



Distribution. — Fossil : Icenian Crag : Postwick, near Norwich. 



Bemarlcs. — The shell figured under the above provisional name is from the 

 Castle Museum at Norwich, having been found many years ago in a section 

 which once yielded some interesting fossils but is unfortunately no longer 

 available. 



It appears to belong to the N. castauea group, and in form approaches some 

 of the mollusca from Alaska described by Dr. Dall. 



I thought at first it might have been a misshapen specimen of N. antiqua, but 

 it differs materially in its general character from any variety of that species I have 

 met with, either Recent or fossil. I think it deserves notice. 



Genus FUSUS, Klein, 1753. 



Fusus longiroster (Brocchi). Plate XIV, fig. 23." 



1814. Murex longiroster, Broechi, Conch, foss. subap., p. 418, pi. viii, fig. 7. 



1836-44. Fusus lomjiroster, Philippi, Eu. Moll. Sic. vol. i, p. 205, 1836 ; vol. ii, p. 179, 1844. 



1872. Fusus longiroster, Bellardi, Moll. Terr. Terz. Piem., pt. i, p. 132. 



1875. Fusus longiroster, Seguenza, Boll. R. Com. Geol. Ital., vol. vi, p. 282. 



1879. Fusus longiroster, Fontaimes, Moll. Plioc. Vail. Rhone, vol. i, p. 14, pi. ii, fig. 9. 



1901. Fusus longiroster, Cossmann, Ess. Palcoconch. comp., vol. iv, p. 10, pi. i, fig. 7. 



1903. Fusus longiroster, Laniplugh, Mem. Geol. Surv., Isle of Man, p. 475, fig. Ixxxv, p. 386. 



1904. Fusus longiroster, Sacco, Moll. Terr. Terz. Piem., pt. xxx, p. 24, pi. vii, figs. 5, 6. 



Specific Characters. — Shell strong, fusiform, turreted ; whorls convex, sub- 

 angular above, with a slightly concave shelf below the suture, the last whorl 



