F. R. Coivper Reed — Fossils from Samrfordwest. 447 



presence of the pits, the shape of the shell, position of beak, and 

 radial ornamentation resemble Schizocrania filosa, Hall.' However, 

 the generic position of our specimen does not admit of a doubt. It 

 appears to be specifically distinct from any so far described, none of 

 the other British species, except T. siluriana, being closely allied, 

 and the name multistriata is therefore proposed for it. 



Crania Ttjrnbtjlli, sp. nov. (PI. XXIII, Figs. 2, 2a.) 



Description. — Shell subquadrate, wider anteriorly, upper valve 

 strongly elevated, convex, subpyramidal ; apex situated nearer 

 anterior than posterior margin ; posterior slope somewhat flattened ; 

 anterior slope short, steep. Cast of interior of upper valve showing 

 pair of anterior adductor muscle-scars situated a little behind apex, 

 nearly in middle of shell, less than their own diameter apart, deep, 

 subcircular, each partly divided internally into two subequal 

 portions by a triangular projection from outer anterior side. Pair of 

 shallow oval posterior adductor impressions, submarginal, posterior, 

 situated about twice their diameter apart at end of broad, slightly 

 diverging shallow grooves running back from anterior adductors. 

 Surface of valve ornamented with very numerous fine, closely-set, 

 subparallel, thread-like, raised lines of equal strength, radiating from 

 umbo and running at right angles to the four sides, with many 

 shorter similar lines of equal strength but of various lengths inter- 

 calated. To the four angles of the shell only a few of the radial 

 lines run the whole way from the umbo, the majority curving round 

 on each side to meet the adjacent sides at right angles. A few weak 

 concentric growth-lines present. 



Dimensions. 



Width at anterior end, 17 mm. Length, 12*5 mm. 



Width at posterior end, 13 mm. Height, 5*0 mm. 



Locality. — Sholeshook Railway Cutting. 



Horizon. — Sholeshook Limestone. 



Remarks. — Only the impression of the exterior of the shell and 

 the cast of the interior of the same valve, both in a somewhat 

 imperfect state, but belonging to the same individual, are known to 

 me. They present characters which dilferentiate them from other 

 described species. The nearest allied appears to be Cr. Crofti, Dav.,^ 

 but this shell has an anterior depression on the surface, the posterior 

 adductors are placed nearer together, there is an internal ridge on 

 the posterior face of the shell, and the external ornamentation is 

 rather coarser. Cr. divaricata, McCoy," is quite distinct. 



Crania Grati, Dav., var. (PI. XXIII, Fig. 3.) 

 There is one small specimen of a Crania which is almost 

 indistinguishable from C. Grayi, Dav.* It consists of an upper 



1 Hall & Clarke: Palseont. New York, vol. viii, Brach., pt. 1, 1892, p. 143, 

 pi. ivG, figs. 22-30. 



2 Davidson: Mon. Brit. Foss. Brach., vol. v, Suppl. Silur., p. 215, pi. xvii, 

 figs. 54-56. 



3 Ibid., vol. iii, p. 78, pi. viii, figs. 7-12. 



^ Davidson : Mon. Brit. Foss. Brach., vol. iii, p. 82, pi. viii, figs. 22-24. 



