178 SUPPLEMENT TO THE BRITISH 



Jurassiques.' It has also been found in the Middle Lias of the Island of Raasay in 

 Scotland. 



162. Waldheimia florella, d'Orb. Dav., Sup., PI. XXIII, figs. 11—13. 



Terebratula florella, d'Orb. Prodrome, No. 272 (Etage Toarcien), 1847. 



— (Wald.) — E. Deslongchamps. Bracbiopodes Jurassiques, p. 115, 



pi. xxvi, figs. 6, 7, 1863. 

 Waldheimia resupinata, 2 varr. R. Tate. The Yorkshire Lias, p. 419, pi. xv, figs. 



12, 13, 1876. 



Shell very elongated, oval; sides rounded, tapering towards the beak and front almost 

 to a point. Dorsal valve of small depth and convexity, concave or divided by a longitudinal 

 mesial groove of moderate depth, to which the lateral portions slope inwards, being 

 slightly and abruptly elevated close to the margin in the posterior half of the valve. 

 Ventral valve very deep, and keeled or roof-shaped ; sides almost flat, beak but slightly 

 produced, incurved, and truncated by a small foramen completed anteriorly by narrow 

 deltidial plates ; beak ridges very sharply defined ; surface smooth, marked by concentric 

 lines of growth. 



Length 12, width 8, depth 6 lines. 



Obs. — M. E. Deslongchamps, who has seen specimens of this shell, at once referred 

 it to W. florella, d'Orb., and considers it to be specifically distinct from W. resupinata. 

 Mr. R. Tate, at p. 419 of his 'Yorkshire Lias,' proposes two varieties for this shell. 



Var. a, Sup., PI. XXIII, fig. 11, "is (he states) the commonest shell in the Cleveland 

 Main Seam, to which it is confined. This form differs from the type in being more 

 elongated and narrower ; the medial sulcus is deeper, and the sides consequently more 

 elevated ; it shows a great approach to W. carinata of the Inferior Oolite." 



Var. b (pyriformis), Dav., Sup., PL XXIII, fig. 12, 13, "has occurred to me only in 

 the shelly shale (or ' cockle-bed ') below the Main Seam at Eston. This variety exhibits a 

 much greater departure from the usual examples of this species in its ovate shape, gibbous 

 valves, and the shallow or ill-defined sulcus on the brachial valve, but agrees with the 

 large specimens of the species figured by Davidson." 



W. florella occurs in the zone of Am. spinatus, Middle Lias, at Wilton (Phillips), 

 Eston, Upleatham, Hobbs Hill, Skenningrove, Belman, Yorkshire (Tate) ; Churchdown 

 Hill, Gloucestershire (Walker). Mr. Deslongchamps states in his description of this species 

 that it occurs in France in the lower beds of the Middle Lias with W. numismalis and a 

 small species of Gryphcea cymhula. It is also found at Vieux Pont in Normandy, and has 

 been collected both in Germany and Spain. 



