178 PLIOCKNE MOLLUSC A. 



collection of the variety convohda described below, but the spiral sculpture is much 

 finer, and the whorls are less convex. 



Var. convoluta, Jeffreys. Plate XXV, figs. 6, 7. 



1867. Fusus gracilis, var. convoluta, Jeffreys, Brit. Conch., vol. iii, p. 386. 

 1890. Sipho gracilis, var. convoluta, Jordan, Journ. of Conch., vol. vi, p. 232. 



Dinumsions. — L. 75 — 85 mm. B. 30 — 32 mm. 



Distribntlon. — Recent: British seas, not common. 



Fossil : Newbournian Crag : Waldringfield. 



liemarks. — Jeffreys states that this variety is smaller, narrower, somewhat 

 cylindrical and more solid, with a longer spire than the type, having sharper 

 ridges, a deeper suture and a mouth proportionately smaller. I have an imperfect 

 shell from Waldringfield which, except as to its size, agrees with this description, as 

 it does with a Recent example from Brora which Mr. de B. Tomlin has been kind 

 enough to send me. They are not unlike one of the varieties of S. cnrtiis described 

 below, and may tend to connect the latter species with S. gracilis. I propose to 

 figure the specimens of the present variety, both Recent and fossil, in PI. XXV of 

 this Memoir. 



Sipho curtus (Jeffreys). Plate XXI, figs. 1 — 8. 



1843. Fusiis corneus, Nyst, Coq. foss. Terr. Tert. Belg., p. 500, pi. xxxix, fig. 23. 



1848. Trophon gracile, S. V. Wood, Mon. Crag Moll, pt. i, p. 46, tab. vi, fig. 10. 



1864. Fusus gracilis, S. P. Woodward, in White's History of Norfolk, 3rd ed., p. 117. 



1867. Fusus curtus, Jeffreys, Brit. Conch., vol. iv, p. 336. 



1871. Fusus curtus, Jeffi-eys, in Prestwich, Quart. Journ. G-eol. Soc, vol. xxvii, p. 492. 



1881. Fusus gracilis, Nyst, Conch. Terr. Tert. Belg., p. 15, pi. i, fig. 10. 



Specific Characters. — Shell fusiform, solid; whorls more or less convex, varying 

 considerably in comparative length and breadth, sometimes compressed below the 

 suture ; ornamented by rather fine and generally inconspicuous spiral strise, crossed 

 by the curved lines of growth which become more distinct on the body-whorl ; 

 apex neither bulbous nor planorboid ; suture well-marked, channelled ; mouth 

 oblong, oval, angulate above ; inner lip forming in some varieties a thin glaze 

 upon the pillar, while in others it is thicker and less closely adherent to it : canal 

 varying greatly in length, usually turning, often sharply, to the left, ending in an 

 oblique notch. 



Dimensions. — L. 50 — 70 mm. B. 20 — 80 mm. 



Distribution. — Fossil : Red Crag, passim, not rare at Little Oakley. Scaldisien 

 and Poederlien of Belgium. 



