lxxxvi 



INFERIOR OOLITE AMMONITES. 



Distinction. — From Ludl. arcitenens, smaller umbilicus, less coarse orna- 

 ment. 



Fig. 48. Fig. 49. Fig. 50. 



Fig. 48. — Radial line of Ludivigella cornu, from specimen in PI. IV, figs. 3, 4. 

 Figs. 49, 50. — Ludivigella cornu. Holotype. Bradford Abbas. 



Localities and Strata. — Dorset: Bradford Abbas, Fossil Bed, lower part; Louse 

 Hill ; Sandford Lane, near Sherborne, in sandy stone. 

 Date of Existence. — Concavi hemera. 



5. LUDWIGELLA CONCAVA (./. Sowerblj). 



Fig. 51. — Ludivigella 

 concava. a, from an 



impression kindly 

 furnished by Mr. G. 

 C. Crick, F'.G.S., of 

 the type specimen, 

 PI. II, figs. 6, 7; 

 h, from specimen in 

 PI. VIII, tigs. 1, 2. 



Plate II, figs. 5, 6; Plate VIII, figs. 1, 2 ; 

 SuppL, Fig. 51 in text. 



1815. Ammonites concavus, J. Sowerhy, Min. Conch., pi. xciv. 



1887. Lioceras concavum, This Monogr., PI. ii, figs. 6, 7 ; 1888, PI. viii, 



figs. 1, 2. 

 1901. Ltjdwigella concava, Proc. Cotteswold Club, vol. xiii, p. 266. 



Description. — Platyleptogyral, concavumbilicate, subcostate. 



Distinction. — From Ludl. cornu, the concavumbilicus. 



Notes. — The umbilicus of Plate VIII, fig. 1, is quite incorrect. 



The size of this specimen seems to be quite out of agreement 

 with that of other Ludwigellse. Perhaps the association with Ludl. 

 concava is incorrect. 



Localities and Strata. — Somerset : "Not a rare species in the 

 neighbourhood of Ilminster" 1 (Sowerby's specimen). Dorset: 

 Bradford Abbas, in the lower part of the Fossil Bed with 

 Ludwigella arcitenens, etc. ; Stoke Knap, in the Building Stone. 



Date of Existence. — Concavi hemera. 



1 ' Mill. Conch.,' vol. i, p. 214. Ilminster is most likely a mistake for Yeovil. I have not found 

 any concavus strata within miles of Ilminster. The localities of the two species in Sowerby's Plate 

 xciv were perbaps transposed. 



