SEARLESIA BJORNSONI. 141 



the late Prof. Forbes in 1838 as Fusing sp., and afterwards described by Strickland 

 as F. Forbesifhas remained a matter of doubt. In 1894 Prof. Kendall, studying the 

 fossiliferous deposits of the Isle of Man, figured a number of shells differing con- 

 siderably in form, size, and sculpture, grouping them under the above name as 

 varieties of one variable species, but from this I am compelled to dissent, as will 

 appear in the sequel. 



In the fourth volume of the British Conchology, moreover, Jeffreys identified 

 F. Forhesi with Buccinum plicosiim, Menke, and with F. cinereiis, Say, but neither 

 can this view be accepted. Fortunately specimens have been found lately at Jermyn 

 Street and figured in Mr. Lamplugh's Survey Memoir, which will clear up this 

 long-standing ([uxstio vexnta. They are clearly identical with the shell known to 

 Forbes and Strickland. Prof. Kendall's fig. 7 appears to be the same. 



Forbes stated that his fossil was found on the shore of the north coast of the 

 Isle of Man, having been cast up apparently by the sea. 



Although differing from T. costifer in the internal crenulation of its outer lij), 

 it corresponds with it generally, and may be grouped with it, I think, as belonging 

 to the same genus. 



I have a worn specimen from Oakley (fig. 3) which seems to agree with the 

 Manx shell. 



Searlesia Bjornsoni (Morch and Poulsen, MS.), sp. nov. Plate XIV, figs. 6 — 8. 



1887. TJrosalpinx Bjornsoni, Morcli aud Poulsen, plates and MS. list in Greologlcal Museum, Copeu- 

 hagen, no. 6, pi. i, fig. 10 (unpublished). 



Specific Characters. — Shell small, strong and solid ; whorls (!, convex, rapidly 

 diminishing in size, the last much the largest, two-thirds the total length ; orna- 

 mented by eight very prominent longitudinal ribs, with deep, rounded sulci between 

 them, as well as by fine but distinct and regular spiral ridges which cross the ribs 

 but do not cause tuberculation, the ribs being less wide than the intervening 

 spaces ; suture deep ; apex slightly mammiform ; mouth oval ; canal distinct, 

 narrow, rather short, and nearly straight; outer lip regularly curved, slightly 

 expanded. 



Dimensions. — L. 15 — 25 mm. B. 8 — 12 mm. 



Distribution. — 'Not known livino-. 



Fossil : "VValtonian Crag : Walton-on-Naze, Little Oakley. New- 

 bournian : Waldringfield, Newbourn. Butleyai: : Butley, Oak Hill, Sutton. Pliocene : 

 Iceland. 



Remarks. — Of this delicately sculptured little shell, which is new to our Crag 

 lists, I have obtained about a dozen specimens, apparently full-grown, from Oakley ; 

 there is one at Jermyn Street from Walton, and others at Cambridge and elsewhere. 



