﻿248 INFERIOR OOLITE AMMONITES. 



border complete; fig. 3 exhibits the ventral area of the end of the last whorl, 

 showing the fine strise crossing a degraded carina. Figs. 9, 10, show two views 

 of a fragment of a young example. 



Dumoetieria radians {Reinecke). Plate XLI, figs. 4 — 8 ; Plate XLII, figs. 1 — 12 ; 



Plate XLIII, figs. 1—4. Woodcut in text, 

 p. 187, fig. 2. 



1818. Nautilus radians, Reineclce. Maris protogaei Nautilos, <fcc, figs. 39, 40. 

 1846. Ammonites eadians depkessus, Quenstedt. Ceph., pi. vii, figs. 5, 6 only. 

 1858. — ■ — Quenstedt. Jura, pi. xl, fig. 9. 



Aalensis, Quenstedt. Ibid., pi. xl, fig. 12. 

 1874. — BADiosus, Dumortier (non Seebach). Etudes Pal. Bassin RhoDe, 



iv, pi. xiv, figs. 2 — 5. 

 1879. Harpoceras subcomptum, Branco. Unt. Dogger; Abh. geol. Spez.-Karte 



Elsass-Lothringen, Bd. ii, pi. v, 

 fig. 3 only (see p. 198). 

 1885. Ammonitks, cf. Aalensis, Quenstedt. Amin. Schwabischen Jura, pi. liv, 



fig. 18 only. 

 1885. — cf . comptus, Quenstedt. Ibid., pi. liv, fig. 46. 



1885. — radians, Quenstedt. Ibid., pi. liv, fig. 44. 



1887. Dumoetieria rhodanica, Haug. " Polymorphidae ;" Neues Jahrbucb fur 



Mineral., &c, Bd. ii, p. 138. 



Discoid, compressed, carinate. Whorls elliptical, the sides convex, and orna- 

 mented with direct, ventrally-inclined, sharply-marked ribs. Ventral area acute, 

 not always defined, divided by a small, distinct carina. Inner margin convex, 

 not defined. Inclusion from one- third to one-half. 



Reinecke's figure of "Nautilus radians'''' certainly leaves much to be desired, 

 and it is evidently not altogether exact. The carina is certainly too prominent ; 

 while the sectional view does not agree with the length of the aperture as shown 

 in the side view, for it is much too short. It is impossible to determine whether 

 this is a mistake of the artist, or whether the sectional view was taken from else- 

 where on the shell ; but when measured by compasses this section will be found to 

 agree with the breadth of the whorl at the bottom of Reinecke's fig. 39 (see p. 187). 



In spite, however, of its mistakes, Reinecke's figure can, as I pointed out at 

 pp. 186, 187, be recognised not only as a Dumortieria on account of its ribbing, but 

 as illustrating the specimens which I have figured under that name ; and this view 

 of the interpretation of Reinecke's figure is just the one taken by Quenstedt, only 

 that he included as " radians " several other forms which have nothing to do with 

 the present species. 1 



1 For a synopsis of species to which the name " radians " has been applied see pp. 188 et seq. 



