SUPPLEMENT.— DEPAOCERAS. lxxix 



Distinction. — -From D.fallax, smaller umbilicus, less coarse costation. 



a/tini. Bradford Abbas. 



Localities and Strata. — Dorset : Bradford Abbas (E. Wilson), Fossil Bed, pre- 

 sumably upper part; Halfway House (Mr. D. Stephens), from the " Blue beds." 

 Date of Existence. — Discitx liemera, presumably. 



3. Depaoceeas foemosum (S. Bvchnan). Plate X, figs. 1,2; Suppl., Fig. 38 in text. 



1888. Lioceras concavum, var. foemosum, This Monogr., 



PI. x, figs. 1, 2. 

 1902. Depaoceras foemosum, Emeud. Amra. Nom., p. 3. 



Description. — Platyleptogyral, subgradumbilicate, subobsoleti- 

 costate. 



Note. — The costae are broad and rather distant, but they are 

 not prominent ; the figure shows them rather too pronounced. 



Distinction. — From Dep. hamatum, smaller umbilicus, which is 

 not costate. 



Locality and Stratum.— Dorset : Bradford Abbas, Fossil Bed, 

 presumably upper part. 



Date of Existence. — Discitse hemera, presumably. 



SuBFALCI- AND BlAKClKADIATE. 1 

 The radial line has a subfalcate form, passing to more or less of a double bow ; 

 in some cases it is distinctly so. Antcedeent stages, of torti- or anguliradins. 

 are presumable; but as yet there is no evidence as to the lime of such changes of 

 radial line in these genera. 



1 This term denotes a radial line with a form like a Greek bow. There are really three curves, 

 one forward in the middle of the lateral area, and two backward on outer and inner thirds. 



Fig. 38.— Radial 



line of 



Depaoceras 



formosum. 



